Uranium-Vanadium Deposits Of The Slick Rock District, Colorado
Uranium-Vanadium Deposits of theSlick Rock District, ColoradoBy Daniel R. ShaweWith a section on Appendix on District ProductionBy William L. ChenowethGEOLOGIC INVESTIGATIONS IN THE SLICK ROCK DISTRICT,SAN MIGUEL AND DOLORES COUNTIES, COLORADOGEOLOGICAL SURVEY PROFESSIONAL PAPER 576-FPrepared on behalf of the U.S. Atomic Energy Commission (now Department of Energy)Detailed comprehensive study of the uranium-vanadium deposits andtheir host rocks contributes to the understanding of the origin andformation (genesis) of the deposits.U.S. Department of the InteriorU.S. Geological Survey
vContentsAbstract.1Introduction.2History of the District.3Geologic Setting of the Ore Deposits.5Characteristics of the Host Rocks.6Chinle Formation.6Morrison Formation.8Distribution and Configuration of Units.8Lithology of the Brushy Basin Member. 9Lithology of the Salt Wash Member.9Lithology of the Ore-Bearing Sandstone.10Relation of Uranium-Vanadium Deposits to Carbonaceous Material.14Uranium-Vanadium Ore Deposits.16Weathered and Unweathered Deposits.16Distribution of Uranium-Vanadium Deposits.16Alteration of Sedimentary Rocks Related to Uranium-Vanadium Ore Deposits.17Source of Barite, and Sulfur and Strontium Isotopes.19Form and Size of Uranium-Vanadium Deposits and Constituent Ore Bodies.19Tabular Ore Deposits (Simple Ore Bodies and More Complex Forms).20Roll Ore Deposits.24Details of Ore Body Form and Texture.27Mineralogy and Petrography of the Ore Deposits.37Moss Back Member Ore Deposits.37Salt Wash Member Ore Deposits.37Petrography of the Salt Wash Member Ore Deposits.39Thin-Section and Heavy-Mineral Studies of Oxidized Cougar Mine Rolls.39Heavy-Mineral Studies Indicate Relation of Authigenic Anatase andBarite to Uranium-Vanadium Ore Deposits .45Chemical Composition of the Uranium-Vanadium Deposits.46District-Wide Distribution of Elements.46Distribution of Elements In and Near a Roll in the Burro No. 7 Mine.47Lead-Isotope Data for the Burro No. 3 Roll Ore Body.56History of Lead in the Burro No. 3 Roll Ore Body.56Uranium-, Thorium-, and Protactinium-Isotope Data for the Burro No. 7 Roll Ore Body.56Strontium-Isotope Distribution Related to Position of Ore Deposits.56Chemical Character of Formation Fluids Involved in Genesis of the Ores.57Regional Relations of Ore Deposits.60Lead Isotopes.60Chemical Correlations.60Age Correlations.61Genesis of the Uranium-Vanadium Ore Deposits.61
viEvolution of Genesis Concepts.61Extending the esA.B.C.Uranium-Vanadium Production.68Account of Mining in the Slick Rock District, 1965.79Chemical Formulas of Minerals Described in this 14.15.16A.16B.Index map showing location of the Slick Rock district.6Generalized geologic map of the Slick Rock district.7Photograph of the ore-bearing sandstone showing lateral variations.10Photograph of the ore-bearing sandstone showing intertonguing natureof Salt Wash Member and overlying Brushy Basin Member.10Silicified log imbedded in the ore-bearing sandstone.14Carbonized, silicified, and mineralized dinosaur bone imbedded inthe ore-bearing sandstone.14Cross section of part of the ore-bearing sandstone showing carbonaceousmaterial concentrated in bedding layers.15Cross section of part of the ore-bearing sandstone showing carbonaceousmaterial, claystone pebbles, and limestone nodule in sandstone.15Sketch of the ore-bearing sandstone in rim exposure showing roll ore bodieslocalized above a basal channel scour.18Cross-sectional sketch of a tabular uranium-vanadium ore body in theMoss Back Member.20Perspective cutaway diagram of the ore deposit at the Ike No. 1 mine, InclineNo. 1, Radium group of mines.22Perspective cutaway diagram of the ore deposit at the King No. 4 mine,Legin group of mines.23Perspective geologic cross sections of roll ore bodies, Cougar mine, Lowergroup of mines.25Perspective cutaway diagram of roll ore bodies, Cougar mine.26Perspective view of part of a roll deposit showing sinuous interconnectingsurfaces of rolls, Cougar mine.27Diagrammatic cross section of rolls in sandstone layers at the base of theore-bearing sandstone, Cougar mine.27Photograph of axial loops in a mined-out roll at the top of the Salt WashMember, Radium group of mines.28Sketch of photograph illustrated in figure 16A.28
9.30.31A–C.32.33.34.35.36.37.38.39.Photograph showing perspective view of the inner (concave) surface of amined-out roll, Cougar mine.29Photograph showing direct view of the inner surface of mined out rollillustrated in figure 17.30Cross-sectional diagram of the mined out roll in figure 18A.30Photograph of roll surface in the Cougar mine.31Sketch diagram of the roll showing details of the relation of uranium-vanadiumore to enclosing rocks .31Cross-sectional diagram of a small roll-like hump in a thin tabular layer ofuranium-vanadium ore, Cougar mine. 31Cross-sectional sketch of a roll ore body showing irregularly curved roll surface,Cougar mine.32Chalcocite nodule in barren sandstone beneath mudstone and near a flat roll,Cougar mine.32Cross-sectional sketch diagram of two juxtaposed rolls.33Cross-sectional sketch of a uranium-vanadium ore layer in flat-beddedsandstone in the Cougar mine.33Cross-sectional sketch of an ore roll showing layering of ore mineralconcentric with the concave surface of the roll, Cougar mine.34Cross-sectional sketch of a compound roll showing two opposing rollsmerged at their upper convex margins, Cougar mine.34Cross-sectional sketch of a roll ore body remnant showing texturalvariations related to bedding characteristics of sandstone, Cougar mine.35Photograph of “rattlesnake” ore from the Sun Cup mine.35Photograph of “striped” ore from the Sun Cup mine.36Cross-sectional sketch of Liesegang ring-like layers of uranium and vanadiumminerals below a thin tabular layer of ore, Burro No. 1 mine.36Diagrams of three oxidized roll ore bodies showing distributions of heavyminerals, and locations of thin sections.40Pen-and-ink drawing of mineralized sandstone, thin section sample C-29,Cougar mine.43Pen-and-ink drawing of barite replacing quartz in mineralized sandstone,thin-section sample C-30, Cougar mine.43Pen-and-ink drawing of mineralized sandstone, thin section sample C-30,Cougar mine.44Pen-and-ink drawing of sandstone partly replaced by chalcocite, thin sectionsample SH-3, Cougar mine.44Pen-and-ink drawing of sandstone impregnated and partially replaced bychalcocite, thin section sample C-l, Cougar mine.45Pen-and-ink drawing of hydrated iron oxide pseudomorphs of pyrite in acopper-rich veinlet near uranium-vanadium ore, thin section sample C-2A,Cougar mine.45Map of the north part of the Slick Rock district showing major structural featuresand amounts of copper in uranium-vanadium deposits.48Map of the north part of the Slick Rock district showing major structural featuresand amounts of lead in uranium-vanadium deposits.49
viii40.41.42A–M.43.Map of the north part of the Slick Rock district showing major structural featuresand amounts of molybdenum in uranium-vanadium deposits.50Map of the north part of the Slick Rock district showing major structural featuresand amounts of nickel in uranium-vanadium deposits.51Diagrams showing inferred distributions of elements in an unoxidized ore roll inthe Burro No. 7 mine: A, uranium; B, vanadium oxide; C, iron; D, titanium;E, chromium; F, silver; G, lead; H, molybdenum; I, selenium; J, copper; K, sulfur;L, zinc; and M, barium.52Diagram of an unoxidized ore roll in the Burro No. 3 mine, showing locations ofsamples for which lead-isotope compositions were determined.5744. Plot of ratios of lead-isotope compositions Pb206/Pb208 vs Pb207/Pb208 of leadmineral samples from various p of the north part of the Slick Rock district and adjacent area showingareas of mined ore deposits. OnlineMap showing locations of diamond-drill holes in the DisappointmentValley area, Slick Rock district. OnlineDiagrammatic cross section showing carbonaceous material in the orebearing sandstone; A-A’ on plate 2. OnlineGeologic sketch map and cross sections of the underground workings at theStrawberry Roan mine south of the Legin group of mines (SM-2, pl. 1). OnlineSimplified geologic map of the underground workings, Cougar mine area,showing distribution of roll ore bodies within the braided-stream pattern ofsandstone lenses (SM-13, pl. 1). OnlineGeologic map and generalized sections of the underground workings,Norma Jean No. 2 mine and Belmont claim, Spud Patch group of mines(SM-13, pl. 1). OnlineGeologic maps and generalized geologic sections of the undergroundworkings, Little Max and Sunday mines, Spud Patch group of mines(SM-13, pl. 1). OnlineGeologic map and cross sections of the underground workings,Ike No. 1 mine, Radium group of mines (SM-5, pl. 1). OnlineGeologic map and cross sections of the underground workings,King No. 4 mine, Legin group of mines (SM-2, pl. 1). OnlineGeologic sketch map of the underground workings, Brighton mine,Radium group of mines (SM-5, pl. 1). OnlineGeologic map and generalized cross sections of surface and undergroundworkings, Mayday mine, Spud Patch group of mines (SM-13, pl. 1). OnlineGeologic map of the underground workings, Frenchy Incline mine,Legin group of mines (SM-2, pl. 1). OnlineGeologic map and generalized cross sections of surface and undergroundworkings, Moqui Jug and Depression claims, Spud Patch group of mines(SM-13, pl. 1). Online
ix14.15.16.17.18.19.20.Geologic map of uranium-vanadium roll axes, faults, and sedimentarystructure exposed in the underground workings of the Cougar mine area,Lower group of mines (SM-9, pl. 1). OnlinePerspective cross sections through the ore deposit at the Cougar mine,Lower group of mines (SM-9, pl. 1). OnlinePerspective cutaway diagram of the uranium-vanadium ore deposit at theCougar mine, Lower group of mines (SM-9, pl. 1). OnlineGeologic map and cross sections of the underground workings at theBennie T. mine, Charles T. group of mines (SM-16, pl. 1). OnlineGeologic cross section showing altered facies sandstone and distributionof anatase relative to subhorizontal mineralized layer in theore-bearing sandstone. OnlineDistribution of barite relative to subhorizontal mineralized layer in theore-bearing sandstone. OnlineMap of the underground workings, Cougar mine, showing lateral distributionof copper in the uranium-vanadium deposit. Online
Uranium-Vanadium Deposits of the Slick Rock District,ColoradoBy Daniel R. ShaweAbstractThe area of the Slick Rock district saw the firstproduction of uranium on the Colorado Plateau. Four periodsof mining follow
6. Geologic map and generalized sections of the underground workings, Norma Jean No. 2 mine and Belmont claim, Spud Patch group of mines (SM-13, pl. 1).Online 7. Geologic maps and generalized geologic sections of the underground
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