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<br />I;: <br /> <br />IV. CRITERION 4 - Mineral Resource Values <br /> <br />I! <br />" <br /> <br />This unit consists of Precambrian igneous and metamorphic rocks and quaternary <br />alluvial fan materials derived from erosion of the Sangre de Cristo Mountains. <br />There are no known economically producible mineral deposits in this unit. <br />Adequate mineral resource information is not currently available. <br /> <br />A. Critical mineral resource values <br /> <br />There are no critical mineral resource values indicated within this <br /> <br />WSA. <br /> <br />~~ <br /> <br />! ~~ <br /> <br />B. Energy minerals values <br /> <br />~ <br /> <br />There is some potential for geothermal resources within this WSA. It <br />is located within the Rio Grande rift zone, a recognized potential geothermal <br />reservoir, and is within 8 miles of the former Alamosa County KGRA. <br /> <br />" <br />~ <br />" <br />" <br />I ~ <br />; <br /> <br />" <br />, <br />I~ <br />I.; <br />I, <br /> <br />C. Other minerals <br /> <br />There are two inactive gold mines located one-half mile to the <br />northeast of this unit. They are possibly related to faulting which extends <br />into the unit. Exploration is necessary to further determine potential. <br /> <br />,; <br />I; <br /> <br />Sand and gravel exist as stream and alluvial fan deposits in the <br />northwest part of the unit. Quality, quantity, and potential markets for these <br />deposits are unknown. These deposits have no unique properties and no existing <br />or potential markets. <br /> <br />'j <br /> <br />" <br /> <br />Igneous and <br />rock can be used for <br />no unique properties <br /> <br />metamorphic rock exists on a portion of <br />building stone, riprap, and road base. <br />and no known nor potential market. <br /> <br />the unit. This <br />This material has <br /> <br />:! <br /> <br />(', ( '}... [, <) <br />,_;,:;, I v':' <br /> <br />A-37 <br />