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<br />IV. CRITERION 4 - Mineral Resource Values <br /> <br />This unit consists largely of Precambrian igneous and metamorphic rocks. No <br />economically producible mineral deposits are known to exist in this unit. <br />Mineral information is considered inadequate. <br /> <br />A. Critical mineral resource values <br /> <br />There are no critical mineral resource values indicated within this <br /> <br />WSA. <br /> <br />B. Energy minerals <br /> <br />There is some potential for geothermal resources within this WSA. It <br />is located within the Rio Grande rift zone which is recognized as a potential <br />geothermal reservoir and is within 5 miles of the former Alamosa County KGRA. <br /> <br />C. Other minerals <br /> <br />There is an abandoned gold mine approximately one-quarter mile <br />southwest of this unit. There may be some relation to faulting which extends <br />into the unit. Potential is unknown but probably small. More exploration is <br />necessary to determine potential. <br /> <br />The entire unit consists of igneous and metamorphic rock. These <br />resources can be utilized as building stone, riprap, road base, etc. At <br />present, there is no known potential market or unique properties for t,his <br />material. The potential for these uses is considered insignificant in the <br />for eseeable future. <br /> <br />(, 27 61 <br /> <br />A-46 <br />