<xbrl xmlns="http://www.xbrl.org/2003/instance" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dei="http://xbrl.sec.gov/dei/2026" xmlns:rxp="http://xbrl.sec.gov/rxp/2026" xmlns:snj="http://xbrl.sec.gov/snj/2026" xmlns:mtx="http://mineralstech.com/20251231" xmlns:iso4217="http://www.xbrl.org/2003/iso4217" xmlns:compsci="http://compsciresources.com" xmlns:country="http://xbrl.sec.gov/country/2026" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:us-types="http://fasb.org/us-types/2026" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance">
  <link:schemaRef xlink:type="simple" xlink:href="mtx-20251231.xsd"/>
  <context id="c0_From1Jan2025To31Dec2025">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c1_From1Jan2025To31Dec2025_1">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>1</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c2_From1Jan2025To31Dec2025_2">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>2</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c3_From1Jan2025To31Dec2025_3">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>3</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c4_From1Jan2025To31Dec2025_4">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>4</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c5_From1Jan2025To31Dec2025_5">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>5</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c6_From1Jan2025To31Dec2025_6">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>6</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c7_From1Jan2025To31Dec2025_7">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>7</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c8_From1Jan2025To31Dec2025_8">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>8</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c9_From1Jan2025To31Dec2025_9">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>9</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c10_From1Jan2025To31Dec2025_10">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>10</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c11_From1Jan2025To31Dec2025_11">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>11</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c12_From1Jan2025To31Dec2025_12">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>12</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c13_From1Jan2025To31Dec2025_13">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>13</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c14_From1Jan2025To31Dec2025_14">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>14</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c15_From1Jan2025To31Dec2025_15">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>15</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c16_From1Jan2025To31Dec2025_16">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>16</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c17_From1Jan2025To31Dec2025_17">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>17</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c18_From1Jan2025To31Dec2025_18">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>18</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c19_From1Jan2025To31Dec2025_19">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>19</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c20_From1Jan2025To31Dec2025_20">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>20</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c21_From1Jan2025To31Dec2025_21">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>21</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c22_From1Jan2025To31Dec2025_22">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>22</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c23_From1Jan2025To31Dec2025_23">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>23</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c24_From1Jan2025To31Dec2025_24">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>24</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c25_From1Jan2025To31Dec2025_25">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>25</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c26_From1Jan2025To31Dec2025_26">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>26</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c27_From1Jan2025To31Dec2025_27">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:typedMember dimension="rxp:PmtAxis">
          <rxp:pmt>27</rxp:pmt>
        </xbrldi:typedMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c28_From1Jan2025To31Dec2025_USFederalGovernmentByProjectMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:USFederalGovernmentByProjectMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c29_From1Jan2025To31Dec2025_AdamsMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:AdamsMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c30_From1Jan2025To31Dec2025_CanaanMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:CanaanMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c31_From1Jan2025To31Dec2025_LucerneValleyMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:LucerneValleyMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c32_From1Jan2025To31Dec2025_PimaCountyMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:PimaCountyMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c33_From1Jan2025To31Dec2025_ColonyMontanaMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:ColonyMontanaMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c34_From1Jan2025To31Dec2025_ColonySouthDakotaMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:ColonySouthDakotaMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c35_From1Jan2025To31Dec2025_ColonyWyomingMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:ColonyWyomingMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c36_From1Jan2025To31Dec2025_LovellMontanaMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:LovellMontanaMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c37_From1Jan2025To31Dec2025_LovellWyomingMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:LovellWyomingMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c38_From1Jan2025To31Dec2025_NevadaMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:NevadaMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c39_From1Jan2025To31Dec2025_SandyRidgeMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:SandyRidgeMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c40_From1Jan2025To31Dec2025_GascoyneMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:GascoyneMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c41_From1Jan2025To31Dec2025_GovernmentOfChinaByProjectMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:GovernmentOfChinaByProjectMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c42_From1Jan2025To31Dec2025_ChaoYangMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:ChaoYangMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c43_From1Jan2025To31Dec2025_LutilaMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:LutilaMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c44_From1Jan2025To31Dec2025_GovernmentOfTurkeyByProjectMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:GovernmentOfTurkeyByProjectMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c45_From1Jan2025To31Dec2025_UnyeMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:UnyeMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c46_From1Jan2025To31Dec2025_EnezMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:EnezMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c47_From1Jan2025To31Dec2025_UsakMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:UsakMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c48_From1Jan2025To31Dec2025_GurulmundiMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:ProjectAxis">mtx:GurulmundiMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c49_From1Jan2025To31Dec2025_US_USFederalGovernmentMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:CountryAxis">country:US</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="rxp:GovernmentAxis">mtx:USFederalGovernmentMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c50_From1Jan2025To31Dec2025_CN_GovernmentOfChinaMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:CountryAxis">country:CN</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="rxp:GovernmentAxis">mtx:GovernmentOfChinaMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c51_From1Jan2025To31Dec2025_CN_JianpingTaxAuthorityMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:CountryAxis">country:CN</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="rxp:GovernmentAxis">mtx:JianpingTaxAuthorityMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c52_From1Jan2025To31Dec2025_SK_GovernmentOfTheSlovakRepublicMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:CountryAxis">country:SK</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="rxp:GovernmentAxis">mtx:GovernmentOfTheSlovakRepublicMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c53_From1Jan2025To31Dec2025_TR_GovernmentOfTurkeyMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:CountryAxis">country:TR</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="rxp:GovernmentAxis">mtx:GovernmentOfTurkeyMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c54_From1Jan2025To31Dec2025_AU_AustraliaFederalGovernmentMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:CountryAxis">country:AU</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="rxp:GovernmentAxis">mtx:AustraliaFederalGovernmentMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <context id="c55_From1Jan2025To31Dec2025_AU_QueenslandStateGovernmentMember">
    <entity>
      <identifier scheme="http://www.sec.gov/CIK">0000891014</identifier>
      <segment>
        <xbrldi:explicitMember dimension="rxp:CountryAxis">country:AU</xbrldi:explicitMember>
        <xbrldi:explicitMember dimension="rxp:GovernmentAxis">mtx:QueenslandStateGovernmentMember</xbrldi:explicitMember>
      </segment>
    </entity>
    <period>
      <startDate>2025-01-01</startDate>
      <endDate>2025-12-31</endDate>
    </period>
  </context>
  <unit id="USD">
    <measure>iso4217:USD</measure>
  </unit>
  <dei:DocumentType contextRef="c0_From1Jan2025To31Dec2025">2.01 SD</dei:DocumentType>
  <dei:AmendmentFlag contextRef="c0_From1Jan2025To31Dec2025">false</dei:AmendmentFlag>
  <dei:EntityCentralIndexKey contextRef="c0_From1Jan2025To31Dec2025">0000891014</dei:EntityCentralIndexKey>
  <dei:EntityRegistrantName contextRef="c0_From1Jan2025To31Dec2025">MINERALS TECHNOLOGIES INC</dei:EntityRegistrantName>
  <dei:DocumentPeriodEndDate contextRef="c0_From1Jan2025To31Dec2025">2025-12-31</dei:DocumentPeriodEndDate>
  <dei:EntityReportingCurrencyISOCode contextRef="c0_From1Jan2025To31Dec2025">USD</dei:EntityReportingCurrencyISOCode>
  <rxp:AlternativeReportingRegime contextRef="c0_From1Jan2025To31Dec2025">NR</rxp:AlternativeReportingRegime>
  <rxp:A unitRef="USD" contextRef="c1_From1Jan2025To31Dec2025_1" decimals="-1">18732000</rxp:A>
  <rxp:P contextRef="c1_From1Jan2025To31Dec2025_1">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c1_From1Jan2025To31Dec2025_1">country:US</rxp:Co>
  <rxp:Gv contextRef="c1_From1Jan2025To31Dec2025_1">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c1_From1Jan2025To31Dec2025_1">mtx:USFederalGovernmentByProjectMember</rxp:Pr>
  <rxp:A unitRef="USD" contextRef="c2_From1Jan2025To31Dec2025_2" decimals="-1">0</rxp:A>
  <rxp:P contextRef="c2_From1Jan2025To31Dec2025_2">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c2_From1Jan2025To31Dec2025_2">country:US</rxp:Co>
  <rxp:Sn contextRef="c2_From1Jan2025To31Dec2025_2">snj:US-MA</rxp:Sn>
  <rxp:Gv contextRef="c2_From1Jan2025To31Dec2025_2">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c2_From1Jan2025To31Dec2025_2">mtx:AdamsMember</rxp:Pr>
  <rxp:R contextRef="c2_From1Jan2025To31Dec2025_2">mtx:LimestoneMember</rxp:R>
  <rxp:Sg contextRef="c2_From1Jan2025To31Dec2025_2">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c2_From1Jan2025To31Dec2025_2">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c3_From1Jan2025To31Dec2025_3" decimals="-1">0</rxp:A>
  <rxp:P contextRef="c3_From1Jan2025To31Dec2025_3">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c3_From1Jan2025To31Dec2025_3">country:US</rxp:Co>
  <rxp:Sn contextRef="c3_From1Jan2025To31Dec2025_3">snj:US-CT</rxp:Sn>
  <rxp:Gv contextRef="c3_From1Jan2025To31Dec2025_3">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c3_From1Jan2025To31Dec2025_3">mtx:CanaanMember</rxp:Pr>
  <rxp:R contextRef="c3_From1Jan2025To31Dec2025_3">mtx:LimestoneMember</rxp:R>
  <rxp:Sg contextRef="c3_From1Jan2025To31Dec2025_3">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c3_From1Jan2025To31Dec2025_3">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c4_From1Jan2025To31Dec2025_4" decimals="-1">69000</rxp:A>
  <rxp:P contextRef="c4_From1Jan2025To31Dec2025_4">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c4_From1Jan2025To31Dec2025_4">country:US</rxp:Co>
  <rxp:Sn contextRef="c4_From1Jan2025To31Dec2025_4">snj:US-CA</rxp:Sn>
  <rxp:Gv contextRef="c4_From1Jan2025To31Dec2025_4">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c4_From1Jan2025To31Dec2025_4">mtx:LucerneValleyMember</rxp:Pr>
  <rxp:R contextRef="c4_From1Jan2025To31Dec2025_4">mtx:LimestoneMember</rxp:R>
  <rxp:Sg contextRef="c4_From1Jan2025To31Dec2025_4">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c4_From1Jan2025To31Dec2025_4">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c5_From1Jan2025To31Dec2025_5" decimals="-1">10000</rxp:A>
  <rxp:P contextRef="c5_From1Jan2025To31Dec2025_5">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c5_From1Jan2025To31Dec2025_5">country:US</rxp:Co>
  <rxp:Sn contextRef="c5_From1Jan2025To31Dec2025_5">snj:US-AZ</rxp:Sn>
  <rxp:Gv contextRef="c5_From1Jan2025To31Dec2025_5">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c5_From1Jan2025To31Dec2025_5">mtx:PimaCountyMember</rxp:Pr>
  <rxp:R contextRef="c5_From1Jan2025To31Dec2025_5">mtx:LimestoneMember</rxp:R>
  <rxp:Sg contextRef="c5_From1Jan2025To31Dec2025_5">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c5_From1Jan2025To31Dec2025_5">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c6_From1Jan2025To31Dec2025_6" decimals="-1">177000</rxp:A>
  <rxp:P contextRef="c6_From1Jan2025To31Dec2025_6">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c6_From1Jan2025To31Dec2025_6">country:US</rxp:Co>
  <rxp:Sn contextRef="c6_From1Jan2025To31Dec2025_6">snj:US-MT</rxp:Sn>
  <rxp:Gv contextRef="c6_From1Jan2025To31Dec2025_6">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c6_From1Jan2025To31Dec2025_6">mtx:ColonyMontanaMember</rxp:Pr>
  <rxp:R contextRef="c6_From1Jan2025To31Dec2025_6">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c6_From1Jan2025To31Dec2025_6">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c6_From1Jan2025To31Dec2025_6">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c7_From1Jan2025To31Dec2025_7" decimals="-1">66000</rxp:A>
  <rxp:P contextRef="c7_From1Jan2025To31Dec2025_7">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c7_From1Jan2025To31Dec2025_7">country:US</rxp:Co>
  <rxp:Sn contextRef="c7_From1Jan2025To31Dec2025_7">snj:US-SD</rxp:Sn>
  <rxp:Gv contextRef="c7_From1Jan2025To31Dec2025_7">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c7_From1Jan2025To31Dec2025_7">mtx:ColonySouthDakotaMember</rxp:Pr>
  <rxp:R contextRef="c7_From1Jan2025To31Dec2025_7">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c7_From1Jan2025To31Dec2025_7">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c7_From1Jan2025To31Dec2025_7">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c8_From1Jan2025To31Dec2025_8" decimals="-1">138000</rxp:A>
  <rxp:P contextRef="c8_From1Jan2025To31Dec2025_8">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c8_From1Jan2025To31Dec2025_8">country:US</rxp:Co>
  <rxp:Sn contextRef="c8_From1Jan2025To31Dec2025_8">snj:US-WY</rxp:Sn>
  <rxp:Gv contextRef="c8_From1Jan2025To31Dec2025_8">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c8_From1Jan2025To31Dec2025_8">mtx:ColonyWyomingMember</rxp:Pr>
  <rxp:R contextRef="c8_From1Jan2025To31Dec2025_8">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c8_From1Jan2025To31Dec2025_8">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c8_From1Jan2025To31Dec2025_8">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c9_From1Jan2025To31Dec2025_9" decimals="-1">99000</rxp:A>
  <rxp:P contextRef="c9_From1Jan2025To31Dec2025_9">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c9_From1Jan2025To31Dec2025_9">country:US</rxp:Co>
  <rxp:Sn contextRef="c9_From1Jan2025To31Dec2025_9">snj:US-MT</rxp:Sn>
  <rxp:Gv contextRef="c9_From1Jan2025To31Dec2025_9">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c9_From1Jan2025To31Dec2025_9">mtx:LovellMontanaMember</rxp:Pr>
  <rxp:R contextRef="c9_From1Jan2025To31Dec2025_9">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c9_From1Jan2025To31Dec2025_9">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c9_From1Jan2025To31Dec2025_9">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c10_From1Jan2025To31Dec2025_10" decimals="-1">398000</rxp:A>
  <rxp:P contextRef="c10_From1Jan2025To31Dec2025_10">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c10_From1Jan2025To31Dec2025_10">country:US</rxp:Co>
  <rxp:Sn contextRef="c10_From1Jan2025To31Dec2025_10">snj:US-WY</rxp:Sn>
  <rxp:Gv contextRef="c10_From1Jan2025To31Dec2025_10">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c10_From1Jan2025To31Dec2025_10">mtx:LovellWyomingMember</rxp:Pr>
  <rxp:R contextRef="c10_From1Jan2025To31Dec2025_10">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c10_From1Jan2025To31Dec2025_10">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c10_From1Jan2025To31Dec2025_10">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c11_From1Jan2025To31Dec2025_11" decimals="-1">104000</rxp:A>
  <rxp:P contextRef="c11_From1Jan2025To31Dec2025_11">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c11_From1Jan2025To31Dec2025_11">country:US</rxp:Co>
  <rxp:Sn contextRef="c11_From1Jan2025To31Dec2025_11">snj:US-NV</rxp:Sn>
  <rxp:Gv contextRef="c11_From1Jan2025To31Dec2025_11">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c11_From1Jan2025To31Dec2025_11">mtx:NevadaMember</rxp:Pr>
  <rxp:R contextRef="c11_From1Jan2025To31Dec2025_11">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c11_From1Jan2025To31Dec2025_11">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c11_From1Jan2025To31Dec2025_11">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c12_From1Jan2025To31Dec2025_12" decimals="-1">0</rxp:A>
  <rxp:P contextRef="c12_From1Jan2025To31Dec2025_12">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c12_From1Jan2025To31Dec2025_12">country:US</rxp:Co>
  <rxp:Sn contextRef="c12_From1Jan2025To31Dec2025_12">snj:US-AL</rxp:Sn>
  <rxp:Gv contextRef="c12_From1Jan2025To31Dec2025_12">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c12_From1Jan2025To31Dec2025_12">mtx:SandyRidgeMember</rxp:Pr>
  <rxp:R contextRef="c12_From1Jan2025To31Dec2025_12">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c12_From1Jan2025To31Dec2025_12">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c12_From1Jan2025To31Dec2025_12">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c13_From1Jan2025To31Dec2025_13" decimals="-1">0</rxp:A>
  <rxp:P contextRef="c13_From1Jan2025To31Dec2025_13">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c13_From1Jan2025To31Dec2025_13">country:US</rxp:Co>
  <rxp:Sn contextRef="c13_From1Jan2025To31Dec2025_13">snj:US-ND</rxp:Sn>
  <rxp:Gv contextRef="c13_From1Jan2025To31Dec2025_13">mtx:USFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c13_From1Jan2025To31Dec2025_13">mtx:GascoyneMember</rxp:Pr>
  <rxp:R contextRef="c13_From1Jan2025To31Dec2025_13">mtx:LeonarditeMember</rxp:R>
  <rxp:Sg contextRef="c13_From1Jan2025To31Dec2025_13">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c13_From1Jan2025To31Dec2025_13">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c14_From1Jan2025To31Dec2025_14" decimals="-1">7125000</rxp:A>
  <rxp:P contextRef="c14_From1Jan2025To31Dec2025_14">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c14_From1Jan2025To31Dec2025_14">country:CN</rxp:Co>
  <rxp:Gv contextRef="c14_From1Jan2025To31Dec2025_14">mtx:GovernmentOfChinaMember</rxp:Gv>
  <rxp:Pr contextRef="c14_From1Jan2025To31Dec2025_14">mtx:GovernmentOfChinaByProjectMember</rxp:Pr>
  <rxp:A unitRef="USD" contextRef="c15_From1Jan2025To31Dec2025_15" decimals="-1">1516000</rxp:A>
  <rxp:P contextRef="c15_From1Jan2025To31Dec2025_15">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c15_From1Jan2025To31Dec2025_15">country:CN</rxp:Co>
  <rxp:Sn contextRef="c15_From1Jan2025To31Dec2025_15">snj:CN-LN</rxp:Sn>
  <rxp:Gv contextRef="c15_From1Jan2025To31Dec2025_15">mtx:JianpingTaxAuthorityMember</rxp:Gv>
  <rxp:Pr contextRef="c15_From1Jan2025To31Dec2025_15">mtx:ChaoYangMember</rxp:Pr>
  <rxp:R contextRef="c15_From1Jan2025To31Dec2025_15">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c15_From1Jan2025To31Dec2025_15">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c15_From1Jan2025To31Dec2025_15">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c16_From1Jan2025To31Dec2025_16" decimals="-1">2000</rxp:A>
  <rxp:P contextRef="c16_From1Jan2025To31Dec2025_16">rxp:CommunityAndSocial</rxp:P>
  <rxp:Co contextRef="c16_From1Jan2025To31Dec2025_16">country:CN</rxp:Co>
  <rxp:Sn contextRef="c16_From1Jan2025To31Dec2025_16">snj:CN-LN</rxp:Sn>
  <rxp:Gv contextRef="c16_From1Jan2025To31Dec2025_16">mtx:JianpingTaxAuthorityMember</rxp:Gv>
  <rxp:Pr contextRef="c16_From1Jan2025To31Dec2025_16">mtx:ChaoYangMember</rxp:Pr>
  <rxp:R contextRef="c16_From1Jan2025To31Dec2025_16">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c16_From1Jan2025To31Dec2025_16">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c16_From1Jan2025To31Dec2025_16">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c17_From1Jan2025To31Dec2025_17" decimals="-1">181000</rxp:A>
  <rxp:P contextRef="c17_From1Jan2025To31Dec2025_17">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c17_From1Jan2025To31Dec2025_17">country:SK</rxp:Co>
  <rxp:Sn contextRef="c17_From1Jan2025To31Dec2025_17">snj:SK-BC</rxp:Sn>
  <rxp:Gv contextRef="c17_From1Jan2025To31Dec2025_17">mtx:GovernmentOfTheSlovakRepublicMember</rxp:Gv>
  <rxp:Pr contextRef="c17_From1Jan2025To31Dec2025_17">mtx:LutilaMember</rxp:Pr>
  <rxp:R contextRef="c17_From1Jan2025To31Dec2025_17">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c17_From1Jan2025To31Dec2025_17">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c17_From1Jan2025To31Dec2025_17">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c18_From1Jan2025To31Dec2025_18" decimals="-1">42000</rxp:A>
  <rxp:P contextRef="c18_From1Jan2025To31Dec2025_18">rxp:Royalties</rxp:P>
  <rxp:Co contextRef="c18_From1Jan2025To31Dec2025_18">country:SK</rxp:Co>
  <rxp:Sn contextRef="c18_From1Jan2025To31Dec2025_18">snj:SK-BC</rxp:Sn>
  <rxp:Gv contextRef="c18_From1Jan2025To31Dec2025_18">mtx:GovernmentOfTheSlovakRepublicMember</rxp:Gv>
  <rxp:Pr contextRef="c18_From1Jan2025To31Dec2025_18">mtx:LutilaMember</rxp:Pr>
  <rxp:R contextRef="c18_From1Jan2025To31Dec2025_18">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c18_From1Jan2025To31Dec2025_18">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c18_From1Jan2025To31Dec2025_18">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c19_From1Jan2025To31Dec2025_19" decimals="-1">28000</rxp:A>
  <rxp:P contextRef="c19_From1Jan2025To31Dec2025_19">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c19_From1Jan2025To31Dec2025_19">country:SK</rxp:Co>
  <rxp:Sn contextRef="c19_From1Jan2025To31Dec2025_19">snj:SK-BC</rxp:Sn>
  <rxp:Gv contextRef="c19_From1Jan2025To31Dec2025_19">mtx:GovernmentOfTheSlovakRepublicMember</rxp:Gv>
  <rxp:Pr contextRef="c19_From1Jan2025To31Dec2025_19">mtx:LutilaMember</rxp:Pr>
  <rxp:R contextRef="c19_From1Jan2025To31Dec2025_19">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c19_From1Jan2025To31Dec2025_19">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c19_From1Jan2025To31Dec2025_19">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c20_From1Jan2025To31Dec2025_20" decimals="-1">5615000</rxp:A>
  <rxp:P contextRef="c20_From1Jan2025To31Dec2025_20">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c20_From1Jan2025To31Dec2025_20">country:TR</rxp:Co>
  <rxp:Gv contextRef="c20_From1Jan2025To31Dec2025_20">mtx:GovernmentOfTurkeyMember</rxp:Gv>
  <rxp:Pr contextRef="c20_From1Jan2025To31Dec2025_20">mtx:GovernmentOfTurkeyByProjectMember</rxp:Pr>
  <rxp:A unitRef="USD" contextRef="c21_From1Jan2025To31Dec2025_21" decimals="-1">175000</rxp:A>
  <rxp:P contextRef="c21_From1Jan2025To31Dec2025_21">rxp:Royalties</rxp:P>
  <rxp:Co contextRef="c21_From1Jan2025To31Dec2025_21">country:TR</rxp:Co>
  <rxp:Sn contextRef="c21_From1Jan2025To31Dec2025_21">snj:TR-52</rxp:Sn>
  <rxp:Gv contextRef="c21_From1Jan2025To31Dec2025_21">mtx:GovernmentOfTurkeyMember</rxp:Gv>
  <rxp:Pr contextRef="c21_From1Jan2025To31Dec2025_21">mtx:UnyeMember</rxp:Pr>
  <rxp:R contextRef="c21_From1Jan2025To31Dec2025_21">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c21_From1Jan2025To31Dec2025_21">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c21_From1Jan2025To31Dec2025_21">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c22_From1Jan2025To31Dec2025_22" decimals="-1">845000</rxp:A>
  <rxp:P contextRef="c22_From1Jan2025To31Dec2025_22">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c22_From1Jan2025To31Dec2025_22">country:TR</rxp:Co>
  <rxp:Sn contextRef="c22_From1Jan2025To31Dec2025_22">snj:TR-52</rxp:Sn>
  <rxp:Gv contextRef="c22_From1Jan2025To31Dec2025_22">mtx:GovernmentOfTurkeyMember</rxp:Gv>
  <rxp:Pr contextRef="c22_From1Jan2025To31Dec2025_22">mtx:UnyeMember</rxp:Pr>
  <rxp:R contextRef="c22_From1Jan2025To31Dec2025_22">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c22_From1Jan2025To31Dec2025_22">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c22_From1Jan2025To31Dec2025_22">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c23_From1Jan2025To31Dec2025_23" decimals="-1">446000</rxp:A>
  <rxp:P contextRef="c23_From1Jan2025To31Dec2025_23">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c23_From1Jan2025To31Dec2025_23">country:TR</rxp:Co>
  <rxp:Sn contextRef="c23_From1Jan2025To31Dec2025_23">snj:TR-22</rxp:Sn>
  <rxp:Gv contextRef="c23_From1Jan2025To31Dec2025_23">mtx:GovernmentOfTurkeyMember</rxp:Gv>
  <rxp:Pr contextRef="c23_From1Jan2025To31Dec2025_23">mtx:EnezMember</rxp:Pr>
  <rxp:R contextRef="c23_From1Jan2025To31Dec2025_23">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c23_From1Jan2025To31Dec2025_23">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c23_From1Jan2025To31Dec2025_23">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c24_From1Jan2025To31Dec2025_24" decimals="-1">148000</rxp:A>
  <rxp:P contextRef="c24_From1Jan2025To31Dec2025_24">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c24_From1Jan2025To31Dec2025_24">country:TR</rxp:Co>
  <rxp:Sn contextRef="c24_From1Jan2025To31Dec2025_24">snj:TR-64</rxp:Sn>
  <rxp:Gv contextRef="c24_From1Jan2025To31Dec2025_24">mtx:GovernmentOfTurkeyMember</rxp:Gv>
  <rxp:Pr contextRef="c24_From1Jan2025To31Dec2025_24">mtx:UsakMember</rxp:Pr>
  <rxp:R contextRef="c24_From1Jan2025To31Dec2025_24">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c24_From1Jan2025To31Dec2025_24">mtx:ConsumerAndSpecialtiesMember</rxp:Sg>
  <rxp:M contextRef="c24_From1Jan2025To31Dec2025_24">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c25_From1Jan2025To31Dec2025_25" decimals="-1">568000</rxp:A>
  <rxp:P contextRef="c25_From1Jan2025To31Dec2025_25">rxp:Taxes</rxp:P>
  <rxp:Co contextRef="c25_From1Jan2025To31Dec2025_25">country:AU</rxp:Co>
  <rxp:Sn contextRef="c25_From1Jan2025To31Dec2025_25">snj:AU-QLD</rxp:Sn>
  <rxp:Gv contextRef="c25_From1Jan2025To31Dec2025_25">mtx:AustraliaFederalGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c25_From1Jan2025To31Dec2025_25">mtx:GurulmundiMember</rxp:Pr>
  <rxp:R contextRef="c25_From1Jan2025To31Dec2025_25">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c25_From1Jan2025To31Dec2025_25">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c25_From1Jan2025To31Dec2025_25">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c26_From1Jan2025To31Dec2025_26" decimals="-1">42000</rxp:A>
  <rxp:P contextRef="c26_From1Jan2025To31Dec2025_26">rxp:Royalties</rxp:P>
  <rxp:Co contextRef="c26_From1Jan2025To31Dec2025_26">country:AU</rxp:Co>
  <rxp:Sn contextRef="c26_From1Jan2025To31Dec2025_26">snj:AU-QLD</rxp:Sn>
  <rxp:Gv contextRef="c26_From1Jan2025To31Dec2025_26">mtx:QueenslandStateGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c26_From1Jan2025To31Dec2025_26">mtx:GurulmundiMember</rxp:Pr>
  <rxp:R contextRef="c26_From1Jan2025To31Dec2025_26">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c26_From1Jan2025To31Dec2025_26">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c26_From1Jan2025To31Dec2025_26">Open Pit</rxp:M>
  <rxp:A unitRef="USD" contextRef="c27_From1Jan2025To31Dec2025_27" decimals="-1">10000</rxp:A>
  <rxp:P contextRef="c27_From1Jan2025To31Dec2025_27">rxp:Fees</rxp:P>
  <rxp:Co contextRef="c27_From1Jan2025To31Dec2025_27">country:AU</rxp:Co>
  <rxp:Sn contextRef="c27_From1Jan2025To31Dec2025_27">snj:AU-QLD</rxp:Sn>
  <rxp:Gv contextRef="c27_From1Jan2025To31Dec2025_27">mtx:QueenslandStateGovernmentMember</rxp:Gv>
  <rxp:Pr contextRef="c27_From1Jan2025To31Dec2025_27">mtx:GurulmundiMember</rxp:Pr>
  <rxp:R contextRef="c27_From1Jan2025To31Dec2025_27">mtx:BentoniteMember</rxp:R>
  <rxp:Sg contextRef="c27_From1Jan2025To31Dec2025_27">mtx:ConsumerAndSpecialtiesAndEngineeredSolutionsMember</rxp:Sg>
  <rxp:M contextRef="c27_From1Jan2025To31Dec2025_27">Open Pit</rxp:M>
  <rxp:Taxes unitRef="USD" contextRef="c28_From1Jan2025To31Dec2025_USFederalGovernmentByProjectMember" decimals="-1">18732000</rxp:Taxes>
  <rxp:TotalPayments unitRef="USD" contextRef="c28_From1Jan2025To31Dec2025_USFederalGovernmentByProjectMember" decimals="-1">18732000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c29_From1Jan2025To31Dec2025_AdamsMember" decimals="-1">0</rxp:Taxes>
  <rxp:TotalPayments unitRef="USD" contextRef="c29_From1Jan2025To31Dec2025_AdamsMember" decimals="-1">0</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c30_From1Jan2025To31Dec2025_CanaanMember" decimals="-1">0</rxp:Taxes>
  <rxp:TotalPayments unitRef="USD" contextRef="c30_From1Jan2025To31Dec2025_CanaanMember" decimals="-1">0</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c31_From1Jan2025To31Dec2025_LucerneValleyMember" decimals="-1">69000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c31_From1Jan2025To31Dec2025_LucerneValleyMember" decimals="-1">69000</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c32_From1Jan2025To31Dec2025_PimaCountyMember" decimals="-1">10000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c32_From1Jan2025To31Dec2025_PimaCountyMember" decimals="-1">10000</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c33_From1Jan2025To31Dec2025_ColonyMontanaMember" decimals="-1">177000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c33_From1Jan2025To31Dec2025_ColonyMontanaMember" decimals="-1">177000</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c34_From1Jan2025To31Dec2025_ColonySouthDakotaMember" decimals="-1">66000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c34_From1Jan2025To31Dec2025_ColonySouthDakotaMember" decimals="-1">66000</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c35_From1Jan2025To31Dec2025_ColonyWyomingMember" decimals="-1">138000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c35_From1Jan2025To31Dec2025_ColonyWyomingMember" decimals="-1">138000</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c36_From1Jan2025To31Dec2025_LovellMontanaMember" decimals="-1">99000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c36_From1Jan2025To31Dec2025_LovellMontanaMember" decimals="-1">99000</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c37_From1Jan2025To31Dec2025_LovellWyomingMember" decimals="-1">398000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c37_From1Jan2025To31Dec2025_LovellWyomingMember" decimals="-1">398000</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c38_From1Jan2025To31Dec2025_NevadaMember" decimals="-1">104000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c38_From1Jan2025To31Dec2025_NevadaMember" decimals="-1">104000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c39_From1Jan2025To31Dec2025_SandyRidgeMember" decimals="-1">0</rxp:Taxes>
  <rxp:TotalPayments unitRef="USD" contextRef="c39_From1Jan2025To31Dec2025_SandyRidgeMember" decimals="-1">0</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c40_From1Jan2025To31Dec2025_GascoyneMember" decimals="-1">0</rxp:Taxes>
  <rxp:TotalPayments unitRef="USD" contextRef="c40_From1Jan2025To31Dec2025_GascoyneMember" decimals="-1">0</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c41_From1Jan2025To31Dec2025_GovernmentOfChinaByProjectMember" decimals="-1">7125000</rxp:Taxes>
  <rxp:TotalPayments unitRef="USD" contextRef="c41_From1Jan2025To31Dec2025_GovernmentOfChinaByProjectMember" decimals="-1">7125000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c42_From1Jan2025To31Dec2025_ChaoYangMember" decimals="-1">1516000</rxp:Taxes>
  <rxp:CommunityAndSocial unitRef="USD" contextRef="c42_From1Jan2025To31Dec2025_ChaoYangMember" decimals="-1">2000</rxp:CommunityAndSocial>
  <rxp:TotalPayments unitRef="USD" contextRef="c42_From1Jan2025To31Dec2025_ChaoYangMember" decimals="-1">1518000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c43_From1Jan2025To31Dec2025_LutilaMember" decimals="-1">181000</rxp:Taxes>
  <rxp:Royalties unitRef="USD" contextRef="c43_From1Jan2025To31Dec2025_LutilaMember" decimals="-1">42000</rxp:Royalties>
  <rxp:Fees unitRef="USD" contextRef="c43_From1Jan2025To31Dec2025_LutilaMember" decimals="-1">28000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c43_From1Jan2025To31Dec2025_LutilaMember" decimals="-1">251000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c44_From1Jan2025To31Dec2025_GovernmentOfTurkeyByProjectMember" decimals="-1">5615000</rxp:Taxes>
  <rxp:TotalPayments unitRef="USD" contextRef="c44_From1Jan2025To31Dec2025_GovernmentOfTurkeyByProjectMember" decimals="-1">5615000</rxp:TotalPayments>
  <rxp:Royalties unitRef="USD" contextRef="c45_From1Jan2025To31Dec2025_UnyeMember" decimals="-1">175000</rxp:Royalties>
  <rxp:Fees unitRef="USD" contextRef="c45_From1Jan2025To31Dec2025_UnyeMember" decimals="-1">845000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c45_From1Jan2025To31Dec2025_UnyeMember" decimals="-1">1020000</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c46_From1Jan2025To31Dec2025_EnezMember" decimals="-1">446000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c46_From1Jan2025To31Dec2025_EnezMember" decimals="-1">446000</rxp:TotalPayments>
  <rxp:Fees unitRef="USD" contextRef="c47_From1Jan2025To31Dec2025_UsakMember" decimals="-1">148000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c47_From1Jan2025To31Dec2025_UsakMember" decimals="-1">148000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c48_From1Jan2025To31Dec2025_GurulmundiMember" decimals="-1">568000</rxp:Taxes>
  <rxp:Royalties unitRef="USD" contextRef="c48_From1Jan2025To31Dec2025_GurulmundiMember" decimals="-1">42000</rxp:Royalties>
  <rxp:Fees unitRef="USD" contextRef="c48_From1Jan2025To31Dec2025_GurulmundiMember" decimals="-1">10000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c48_From1Jan2025To31Dec2025_GurulmundiMember" decimals="-1">620000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c49_From1Jan2025To31Dec2025_US_USFederalGovernmentMember" decimals="-1">18732000</rxp:Taxes>
  <rxp:Fees unitRef="USD" contextRef="c49_From1Jan2025To31Dec2025_US_USFederalGovernmentMember" decimals="-1">1061000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c49_From1Jan2025To31Dec2025_US_USFederalGovernmentMember" decimals="-1">19793000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c50_From1Jan2025To31Dec2025_CN_GovernmentOfChinaMember" decimals="-1">7125000</rxp:Taxes>
  <rxp:TotalPayments unitRef="USD" contextRef="c50_From1Jan2025To31Dec2025_CN_GovernmentOfChinaMember" decimals="-1">7125000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c51_From1Jan2025To31Dec2025_CN_JianpingTaxAuthorityMember" decimals="-1">1516000</rxp:Taxes>
  <rxp:CommunityAndSocial unitRef="USD" contextRef="c51_From1Jan2025To31Dec2025_CN_JianpingTaxAuthorityMember" decimals="-1">2000</rxp:CommunityAndSocial>
  <rxp:TotalPayments unitRef="USD" contextRef="c51_From1Jan2025To31Dec2025_CN_JianpingTaxAuthorityMember" decimals="-1">1518000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c52_From1Jan2025To31Dec2025_SK_GovernmentOfTheSlovakRepublicMember" decimals="-1">181000</rxp:Taxes>
  <rxp:Royalties unitRef="USD" contextRef="c52_From1Jan2025To31Dec2025_SK_GovernmentOfTheSlovakRepublicMember" decimals="-1">42000</rxp:Royalties>
  <rxp:Fees unitRef="USD" contextRef="c52_From1Jan2025To31Dec2025_SK_GovernmentOfTheSlovakRepublicMember" decimals="-1">28000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c52_From1Jan2025To31Dec2025_SK_GovernmentOfTheSlovakRepublicMember" decimals="-1">251000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c53_From1Jan2025To31Dec2025_TR_GovernmentOfTurkeyMember" decimals="-1">5615000</rxp:Taxes>
  <rxp:Royalties unitRef="USD" contextRef="c53_From1Jan2025To31Dec2025_TR_GovernmentOfTurkeyMember" decimals="-1">175000</rxp:Royalties>
  <rxp:Fees unitRef="USD" contextRef="c53_From1Jan2025To31Dec2025_TR_GovernmentOfTurkeyMember" decimals="-1">1439000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c53_From1Jan2025To31Dec2025_TR_GovernmentOfTurkeyMember" decimals="-1">7229000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c54_From1Jan2025To31Dec2025_AU_AustraliaFederalGovernmentMember" decimals="-1">568000</rxp:Taxes>
  <rxp:TotalPayments unitRef="USD" contextRef="c54_From1Jan2025To31Dec2025_AU_AustraliaFederalGovernmentMember" decimals="-1">568000</rxp:TotalPayments>
  <rxp:Royalties unitRef="USD" contextRef="c55_From1Jan2025To31Dec2025_AU_QueenslandStateGovernmentMember" decimals="-1">42000</rxp:Royalties>
  <rxp:Fees unitRef="USD" contextRef="c55_From1Jan2025To31Dec2025_AU_QueenslandStateGovernmentMember" decimals="-1">10000</rxp:Fees>
  <rxp:TotalPayments unitRef="USD" contextRef="c55_From1Jan2025To31Dec2025_AU_QueenslandStateGovernmentMember" decimals="-1">52000</rxp:TotalPayments>
  <rxp:Taxes unitRef="USD" contextRef="c0_From1Jan2025To31Dec2025" decimals="-1">33737000</rxp:Taxes>
  <rxp:Royalties unitRef="USD" contextRef="c0_From1Jan2025To31Dec2025" decimals="-1">259000</rxp:Royalties>
  <rxp:Fees unitRef="USD" contextRef="c0_From1Jan2025To31Dec2025" decimals="-1">2538000</rxp:Fees>
  <rxp:CommunityAndSocial unitRef="USD" contextRef="c0_From1Jan2025To31Dec2025" decimals="-1">2000</rxp:CommunityAndSocial>
  <rxp:TotalPayments unitRef="USD" contextRef="c0_From1Jan2025To31Dec2025" decimals="-1">36536000</rxp:TotalPayments>
</xbrl>
