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Sandra J. Soulliere, Margo I. Toth, Viki Bankey, Steven M. Smith, James A Sandra J. Soulliere, Margo I. Toth, Viki Bankey, Steven M. Smith, James A. Pitkin, Theresa M. Cookro, Laura N. Robinson Roberts, Carol Molnia, Craig J. Wandrey, Ben E. Law, Charles W. Spencer, and Charles E. Barker U.S. Geological Survey with a section on Salable Minerals by John S. Dersch, U.S. Forest Service U.S. Geological Survey Open-File Report 96-082 October 1, 1996 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS. CONTENTS Summary ............................................................. 1 Character and Geologic Setting ......................................... 1 Mineral Resources .................................................. 2 Energy Resources .................................................. 9 Undiscovered Mineral and Energy Resources ................................ 9 Locatable Minerals ............................................ 9 Leasable Minerals ............................................ 11 Salable Minerals .............................................. 12 Quantitative Assessment of Metallic Resources Using Grade-Tonnage Models ........... 13 Introduction ........................................................... 13 Geographic Setting ................................................. 13 Methods for Identifying Favorable Areas for Undiscovered Mineral Resources ........... 15 Previous Assessments ................................................ 15 Acknowledgments .................................................. 15 Geology .............................................................. 18 Geologic History ................................................... 18 Description of Rock Units ............................................. 19 Proterozoic Rocks ............................................ 19 Paleozoic Rocks .............................................. 20 Mesozoic Rocks ............................................. 20 Middle Tertiary Rocks .......................................... 21 Late Cretaceous and Tertiary Rocks ................................. 21 Quaternary and Pliocene (?) Unconsolidated Deposits ...................... 22 Colorado Mineral Belt ............................................... 22 Structural Geology ................................................. 24 Geochemistry .......................................................... 25 Geochemical Surveys ................................................ 25 Method of Study ................................................... 25 Results ......................................................... 27 Hahns Peak Mining District ...................................... 27 Cam Claims Area ............................................. 27 Henderson-Urad Molybdenum Area ................................. 27 Mt. Cumulus ................................................ 28 Vasquez Peak Molybdenum Anomalous Area ........................... 28 Bear Creek-Lone Pine Creek Anomalous Area .......................... 28 Red Canyon-Crystal Mining District ................................. 28 Spring Claims Area ........................................... 29 Diamond Park Area ........................................... 29 Beaver Creek Area (Farwell Mining District) ........................... 29 Dailey (Atlantic) Mining District ................................... 29 King Solomon Mine Area (Farwell Mining District) ....................... 29 La Plata Mining District......................................... 30 Teller Mining District .......................................... 30 Red Elephant Mountain Area ..................................... 30 11 Beaver Creek-Norris Creek Area ................................... 30 Beaver Creek Area ............................................ 31 Spencer Heights Area .......................................... 31 Greenville Mine Area .......................................... 31 Lower Slavonia Mining District .................................... 31 Upper Slavonia Mining District .................................... 31 Pearl Mining District........................................... 32 Poison Ridge Area (A.O. Porphyry Copper Deposit) ...................... 32 Peak 9731-Elkhorn Complex Area .................................. 32 Big Creek Area .............................................. 32 Continental Divide-Fish Creek Reservoir Anomalous Area .................. 32 Morrison Creek-Beaver Creek Anomalous Area ......................... 33 Other Occurrences ............................................ 33 Geophysical Studies ...................................................... 35 Previous Studies ................................................... 35 Gravity Data ..................................................... 36 Aeromagnetic Data ................................................. 40 Physical Properties of Rocks ........................................... 41 Interpretations of Gravity and Magnetic Data ................................ 44 Aerial Gamma-ray Radioactivity ......................................... 53 Introduction ................................................ 53 Discussion ................................................. 54 Interpretation ................................................ 60 Analysis of Radioelement Data by NURE Aerial Contractor ................. 61 Mineral Resources - Locatable Minerals ......................................... 64 Mining and Exploration History ......................................... 64 Potential for Undiscovered Mineral Resources Locatable Minerals .................. 64 Stockwork Molybdenum ........................................ 65 Porphyry Copper ............................................. 68 Polymetallic Veins ............................................ 72 Stratabound Massive Sulfides ..................................... 76 Fluorspar Veins .............................................. 79 Vein Uranium ............................................... 81 Sandstone Uranium-Vanadium ..................................... 84 Placer Gold ................................................. 87 PGE in Ultramafics ............................................ 90 U-Th-REE in Pegmatites ........................................ 93 Minor Occurrences ............................................ 96 Mineral Resources - Leasable Minerals .......................................... 97 Coal Geology and Resources ........................................... 98 Introduction ................................................ 98 Area 1 ................................................... 101 Methods Used to Estimate Coal Resources ............................ 107 Mesaverde Group Coals .................................. 107 Lance Formation Coals ................................... 115 Fort Union Formation Coals ................................ 115 Limitation of Data ...................................... 117 m Potential for Other Undiscovered Coal Resources ....................... 118 Areas 2, 4, and 6 ....................................... 118 Area 3 .............................................. 118 Area 5 .............................................. 119 Oil, Gas, and Coal Bed Methane Resources ................................ 120 Introduction ............................................... 120 Conventional Hydrocarbon Accumulations ............................ 120 Subthrust Hydrocarbon Accumulations .............................. 124 Unconventional Hydrocarbon Accumulations .......................... 124 Coalbed Methane ....................................... 124 Basin-Centered Gas Accumulation ............................ 125 Oil in Fractured Shales ................................... 127 Geothermal Resources ................................................... 130 Mineral Resources - Salable Minerals .......................................... 130 Crushed Aggregate ................................................ 131 Dimension Stone .................................................. 132 Sand and Gravel .................................................. 132 Probabilistic Assessment of Undiscovered Metallic Endowment using grade-tonnage models ....... 133 Introduction ..................................................... 133 Assessment method ................................................ 133 Delineation of Permissive Areas .................................. 133 Grade Tonnage Models and Estimation of Undiscovered Deposits ............. 134 Mark3 Computer Program ...................................... 135 Calculation of the Mean and the Median ............................. 135 Results ........................................................ 136 Massive Sulfide or Sierran Kuroko Deposits ........................... 136 Porphyry Copper Deposits ...................................... 136 Placer Gold Deposits .......................................... 139 Summary of Environmental Studies ........................................... 139 Mines and Mineralized Areas .......................................... 139 Water Quality and Atmospheric Studies ................................... 140 References ........................................................... 142 Appendix 1. Geologic time chart ............................................. 159 Appendix 2. Definitions of levels of mineral resource potential and certainty of assessment ....... 160 Appendix 3. Coal resource classification .......................................
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