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J GEOLOGY of URANIUM DEPOSITS in the C NORTHERN PART of the ROCKY MOUNTAIN ~ PROVINCE of COLORADO I by Roger C

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J GEOLOGY of URANIUM DEPOSITS in the C NORTHERN PART of the ROCKY MOUNTAIN ~ PROVINCE of COLORADO I by Roger C :NER \EC-RD 11111111111 1 4 AEC-RD-14 CJ. I UNITED STATES ATOMIC ENERGY COMMISSION GRAND JUNCTION OFFICE PRODUCTION EVALUATION DIVISION RESOURCE APPRAISAl BRANCH t J GEOLOGY OF URANIUM DEPOSITS IN THE C NORTHERN PART OF THE ROCKY MOUNTAIN ~ PROVINCE OF COLORADO I by Roger C. Malan ~ Issue Date May 1983 Grand Junction Area Office Grand Junction. Colorado Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. c~n&::;?'j_ >,fc..~ L'~ \t,.\ AEC-RD-14 UNITED STATES ATOMIC ENERGY COHMISSIOI'I GRAND JUNCTION OFFICE PRODUCTION EVALUATION DIVISION RESOURCE APPRAISAL BRANCH GEOLOGY OF URANIUH DEPOSITS IN THE NORTHEfui PART OF THE ROCKY HOUNTAIN PROVINCE OF COLORADO BY Roger C. '!alan DATE DUE October 1965 nd Junction, Colorado DEMCO, INC. 38·2931 Geology of Uranium Deposits in the Northern Part of the Rocky Mountain Province of Colorado TABLE OF CONTENTS Page SUMMARY. • • • • 9 INTRODUCTION • • 9 URANIUM INDUSTRY 14 HISTORY. • • 14 PRODUCTION AND RESERVES. 15 EXPLORATION. 17 MINING • 20 MILLS. • 20 PROPERT'l CONTROL 20 REGIONAL GEOLOGIC HISTORY. 21 PRE CAME RIAl.'! • 21 PALEOZOIC. 22 MESOZOIC . • 24 CENOZOIC • • 26 GEOLOGY OF URANIUM LOCALITIES. 29 FRONT RANGE. • 29 DISTRIBUTION AND TYPES OF DEPOSITS 30 HOST ROCKS • • • • • • 30 AGE OF HOST ROCKS ••• 30 AGE OF l1INERALIZATION. 31 FEATURES OF DEPOSITS . 31 ORE CONTROLS . • • • 32 DESCRIPTION OF LOCALITIES 33 JAi~STOWN ••••••. 33 RALSTON CREEK-GOLDEN GATE CANYON. 35 MORRISON-IDLEDALE LOCALITY .••. 39 CENTRAL CITY-IDAHO SPRINGS LOCALITY 50 THIRTYNINE MILE VOLCANIC FIELD 55 GEOLOGIC HISTORY . • 55 TALLAHASSEE CREEK 55 HIGH PARK • 60 ORE DEPOSITS . 62 TALLAHASSEE CREEK 62 HIGH PARK . 63 TURKEY CREEK ANTICLINE 65 MIDDLE PARK. • . • 70 TROUBLESOME CREEK. 73 RABBIT EARS PASS 76 BEAVER CREEK . • 78 SOUTH PA~~ . • • • . • 80 ANTERO LAKE BEDS 81 GARO LOCALITY. dl ALMA DISTRICT. 82 TRACHYTE FLOWS 82 NORTH PARK ••• 82 RED CANYON .. 82 3 SHEEP MOUNTAIN 84 DENVER BASIN • 8S LIMON • • • • 89 COLORADO SPRINGS 89 NORTHEASTERN COLORADO. 90 EAGLE BASIN ..••.. 90 VAIL PASS •••• 90 WOLCOTT LOCALITY 92 CONCLUSIONS. 94 REFERENCES . • • • • 97 LIST OF ILLUSTRATIONS Figure l Generalized Geologic Map of Colorado Showing Regions and Localities of Appraisal (Overlay lA in pocket) • • • • . • • • • • • • • • 12 Figure 2 Distribution of Uranium Production Plus Reserves by Deposit Types. • • • • • • • • • • 13 Figure 3 Yearly Production in the Northern Part of the Rocky Mountain Province of Colorado • • • • • • • 16 Figure 4 Percent of Reserves Relative to Reserves Plus Production, Northern Part of the Rocky Mountain Province of Colorado. • • • • • • . • . 18 Figure S Cambrian Through Mississippian Paleogeologic Maps (Overlays SA through SF in pocket). • . 23 Figure 6 Generalized Pennsylvanian Paleotectonic Map Showing Wichita and Ancestral Rocky Mountain Orogenic Systems (Overlays 6A and 6B in pocket) ••• 2S Figure 7 Precambrian, Late Paleozoic, and Tertiary Uranium Metallotectonic Maps of Colorado (Overlays 7A through 7C in. pocket) .••..•...• 27 Figure 8 Generalized Geologic Map Showing Uranium Localities in the Central Part of the Front Range .. 28 Figure 9 Generalized Geologic and Metal Distribution Maps of the Jamestown Locality of the Front Range, Boulder County, Colorado (Overlays 9A through 9D in pocket) . • . • . • • . • • • . 34 Figure 10 Geologic Map Showing Conjugate Vein System in Upper Level Workings at the Fair Day Mine, Jamestown Locality, Boulder County, Colorado ••••. 36 Figure ll Geologic Map of Ralston Buttes Quadrangle Showing Uranium Deposits in the Ralston Creek and Golden Gate Canyon Locality of the Front Range, Jefferson County, Colorado ...••.••.. 37 4 Figure 12 Geologic Map of the Schwartzwalder Mine Area, Jefferson County, Colorado. • • . 38 Figure 13 Development of Vein System at the Schwartzwalder Mine, Jefferson County, Colorado. • • • . • • • • . 40 Figure 14 Geologic Plan Map, Steve Level, Schwartzwalder Mine, Jefferson County, Colorado. • . .•.••• 41 Figure 15 Vein Patterns at Selected Levels in the Schwartzwalder Mine, Jefferson County, Colorado ••• 42 Figure 16 Schematic Section Showing Veins at the Schwartzwalder Mine, Jefferson County, Colorado .•• 43 Figure 17 Inclined Longitudinal Section in Plane of the Illinois Vein, Schwartzwalder Mine, Jefferson County, Colorado ••••••• • • . • 44 Figure 18 Inclined Longitudinal Section in Plane of the Nebraska Vein, Schwartzwalder Mine, Jefferson County, Colorado. • • . • . • . 45 Figure 19 Paragenetic Sequence at the Schwartzwalder Mine, Jefferson County, Colorado. • •....• 0 ••• 46 Figure 20 Geologic Map and Section of the Idledale­ Morrison Locality of the Front Range, Jefferson County, Colorado. • • • • • • ••• 47 Figure 21 Generalized Geologic Plan and Section of the Vicinity of the Mann and Pallaoro Mines, Jefferson County, Colorado. • . • . • • • . 48 Figure 22 Generalized Geologic Map Showing Veins in the Idledale Locality, Jefferson County, Colorado .•.• 49 Figure 23 Geologic Map of the Wright Lease (Foothills) Mine, Idledale locality, Jefferson County, Colorado. • • • • • • • • • • . • • • • • • • • • 51 Figure 24 Inclined Longitudinal Section in Plane of Vein, Wright Lease (Foothills) Mine, Idledale Locality, Jefferson County, Colorado •.••••.•• 52 Figure 25 Generalized Geologic Map and Section Showing Metal Distribution in the Central City-Idaho Springs Locality of the Front Range, Gilpin and Clear Creek Counties, Colorado (Overlay 25A in pocket). • • 0 • • • • • • • • • • • • • • • 53 Figure 26 Generalized Geologic Map Showing Uranium Localities in the Thirtynine Mile Volcanic Field Province, Fremont, Park, and Teller Counties, Colorado. • • ••....••. • • . 54 5 Figure 27 Generalized Geologic Map and Sections of the Tallahassee Creek and Cottonwood Creek Basins, Thirtynine Mile Volcanic Field, Fremont County, Colorado. • . • • • • • • • • • . • • . • • 56 Figure 28 Geologic Map and Section of the High Park Locality, Teller and Fremont Counties, Colorado ••• 57 Figure 29 Generalized Geologic Map of the Southern South Park and Thirtynine Mile Volcanic Field Region Showing Distribution of Deposits and Early Tertiary Paleodrainage Systems, Central Colorado. • 58 Figure 30 Detailed Geologic Map and Sections of the Tallahassee Creek and Cottonwood Creek Basins, Thirtynine Mile Volcanic Field, Fremont County, Colorado. • . • • . • • . • • • . • • . • 61 Figure 31 Plan and Sections of the Productive Area in Eocene Arkose, Tallahassee Creek Locality, Fremont County, Colorado ••••••• • • • 64 Figure 32 Generalized Stratigraphic Correlation Chart of Central Colorado Basins • • • • 66 Figure 33 Geologic Map and Section of the Turkey Creek Anticline, Pueblo and El Paso Counties, Colorado. , . 67 Figure 34 Generalized Columnar Section, Turkey Creek Area, Pueblo and El Paso Counties, Colorado ..•.. 68 Figure 35 Distribution of Uranium Occurrences in the Dakota Formation in the Rocky Mountains of Colorado • 71 Figure 36 Geologic Map Showing Uranium Localities in North and Middle Parks, Colorado. • . • • . • . • 7 2 Figure 37 Geologic Map and Generalized Section of the Troublesome Creek Locality, Middle Park Basin, Grand County, Colorado. • . • • • • .• 74 Figure 38 Generalized Geologic Section Through the Alaska Humes Deposit, Rabbit Ears Pass Locality, Grand County, Colorado. • • . • . •.. 77 Figure 39 Generalized Sections Through Sheep Mountain, North Park and Beaver Creek, Middle Park, Jackson and Grand Counties, Colorado. • . 79 Figure 40 Generalized Geologic Map of the Red Canyon Locality, Jackson County, Colorado. • . • . •. 83 Figure 41 Generalized Geologic and Structure Contour Map of the Denver Basin . • • • . • . • . • • • • 86 6 Figure 42 Generalized Geologic Map and Section of the Limon Locality, Denver Basin, Elbert County, Colorado ...••••.•••.•••.••••.•• 88 Figure 43 Location Map, Geologic Maps and Section, Vail Pass Locality, Eagle Basin, Eagle County, Colorado •••.•••••• 0 0 91 Figure 44 Generalized Geologic Map of the Wolcott Locality, Eagle County, Colorado. • • • •..•..•..• 93 7 GEOLOGY OF URANIUM DEPOSITS IN THE NORTHERN PART OF THE ROCKY MOUNTAIN PROVINCE OF COLORADO by Roger C. Malan SUMMARY This report is a compilation of the results of studies by the Atomic Energy Commission (AEC) on the uranium geology and resources in the northern part of the Rocky Mountain province of Colorado, an area of about 17,500 square miles. Current reserves and/or production are credited to 80 deposits of which 70 percent -contain less than 1,000 tons of ore. The largest deposit, the Schwartzwalder, accounts for 75 percent of all production and current reserves. In 1961, the peak year of production, about 72,000 tons of ore was produced from 21 properties. There are six types of uranium deposits and there were at least four different periods of uranium mineralization in the northern part of the Colorado Rockies.
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