Uranium in the Wyoming Landscape Conservation 

Initiative Study Area, Southwestern Wyoming

By Anna B. Wilson

Open-File Report 2014–1123

U.S. Department of the Interior

U.S. Geological Survey
ii

U.S. Department of the Interior

SALLY JEWELL, Secretary

U.S. Geological Survey

Suzette M. Kimball, Acting Director

U.S. Geological Survey, Reston, Virginia: 2015 

 

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contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items

must be secured from the copyright owner.

Suggested citation:

Wilson, A.B., 2015, Uranium in the Wyoming Landscape Conservation Initiative Study Area, 

southwestern Wyoming: U.S. Geological Survey Open-File Report 2014–1123, 33 p., 1 plate,

http://dx.doi.org/10.3133/ofr20141123. 

ISSN 2331-1258 (online)
iii

Contents

Abstract ...................................................................................................................................................................... 1 

Introduction................................................................................................................................................................. 1 

Geology ...................................................................................................................................................................... 3 

Mining Methods .......................................................................................................................................................... 4 

Development of Uranium Resources.......................................................................................................................... 4 

Mines, Prospects, and Occurrences ..................................................................................................................... 15

Mineral Claim Activity 1976 to 2010...................................................................................................................... 18

Uranium Mineralized Areas ...................................................................................................................................... 19

Ketchum Buttes..................................................................................................................................................... 19

Poison Basin......................................................................................................................................................... 20

Shirley Basin......................................................................................................................................................... 22

Crooks Gap–Green Mountain Area....................................................................................................................... 24

Great Divide Basin ................................................................................................................................................ 26

Acknowledgments .................................................................................................................................................... 28

References Cited...................................................................................................................................................... 29

Glossary ................................................................................................................................................................... 32

Appendix A. Complete U.S. Geological Survey Mineral Resources Data System (MRDS) Records for All 

Primary Uranium Sites and Districts in Wyoming Landscape Conservation Initiative Study Area, Arranged 

by County ................................................................................................................................................................. 33

Appendix B. Metadata for the U.S. Geological Survey Mineral Resources Data System Records in 

Wyoming Landscape Conservation Initiative Study Area ......................................................................................... 33 

Plate

1. Map of uranium mines, prospects, occurrences, and mineralized areas in the Wyoming Landscape 

Conservation Initiative Study Area, southwestern Wyoming. Scale 1:500,000...........................................link

Figures

1. Historic U3O8 production in Wyoming, 1951–2014 ........................................................................................ 2 

2. Photograph of waste piles left by uranium mining in Poison Basin, southwestern Wyoming......................... 5 

3. Maps of claim activity at 5-year intervals, 1976–2010, southwestern Wyoming .......................................... 14

4. Photograph of abandoned trench in Poison Basin, southwestern Wyoming................................................ 20

5. Photograph of one of the small underground mines in Poison Basin, southwestern Wyoming ................... 21

6. Photograph of a reclaimed mine site in Shirley Basin, southwestern Wyoming........................................... 23

7. Photographs of Walker Jenkins Lake, a reclaimed and repurposed open-pit uranium mine in 

Shirley Basin, southwestern Wyoming......................................................................................................... 24

8. Photograph of Big Eagle mine, Crooks Gap–Green Mountain area, southwestern Wyoming ..................... 26
iv

Tables

1. Comparison of production, resources, and endowments of each of the uranium areas ................................ 2 

2. List of Mineral Resources Data System records for producers or past producers in the study area 

and the tonnage of ore produced................................................................................................................. 16

Conversion Factors

Inch/Pound to SI

Multiply By To obtain

Length

inch (in.) 2.54 centimeter (cm)

mile (mi) 1.609 kilometer (km)

yard (yd) 0.9144 meter (m)

Area

square foot (ft2) 929.0 square centimeter (cm2

)

section (640 acres or 1 square mile) 259.0 hectare (ha) 

Mass

pound, avoirdupois (lb) 0.4536 kilogram (kg)

ton, short (2,000 lb) 0.9072 metric ton (tonne, t)

SI to Inch/Pound

Multiply By To obtain

Length

centimeter (cm) 0.3937 inch (in.)

kilometer (km) 0.6214 mile (mi)

meter (m) 1.094 yard (yd) 

Area

hectare 0.003861 section (640 acres or 1 square mile, sq. mi.)

Mass

kilogram (kg) 2.205 pound avoirdupois (lb)

metric ton (tonne, t) 1.102 ton, short (2,000 lb)

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83)
Uranium in the Wyoming Landscape Conservation 

Initiative Study Area, Southwestern Wyoming

By Anna B. Wilson

Abstract

Wyoming has led the nation as the producer of uranium ore since 1995 and contains the 

largest reserves of any state. Approximately one third of Wyoming’s total production came from 

deposits in, or immediately adjacent to, the Wyoming Landscape Conservation Initiative (WLCI) 

study area in the southwestern corner of the state including all of Carbon, Lincoln, Sublette, 

Sweetwater, Uinta, and parts of southern Fremont Counties. Conventional open-pit and 

underground mining methods were employed in the study area until the early 1990s. Since the 

early 1990s, all uranium mining has been by in-situ recovery (also called in-situ leach). It is 

estimated that statewide remaining resources of 141,000 tonnes of uranium are about twice the 

84,000 tonnes of uranium that the state has already produced. 

An evaluation of the mineral commodities present in the WLCI study area that may have a 

role in the development of southwest Wyoming includes uranium. The WLCI study area contains 

five uranium mineralized areas: Ketchum Buttes, Poison Basin, Shirley Basin, the southern part of 

Crooks Gap–Green Mountain, and most of Great Divide Basin. Mineralized areas described in the 

report and outlined on an accompanying map are based on the presence of either contiguous claim 

blocks, continuous mineralization adjacent to prospective uranium properties, suggestions of 

mineralization based on site entries in the U.S. Geological Survey’s Mineral Resources Data 

System (MRDS), or extension of geologic host units or structures. Mineralized areas are not the 

same as mining districts: the latter have defined administrative boundaries. 

In the WLCI study area, all uranium areas except Poison Basin and Ketchum Buttes 

contain roll-front deposits in Eocene (56–34 Ma) sedimentary rocks. Tabular sandstone-hosted 

uranium deposits are also recognized within the study area. 

Introduction

Wyoming has been the nation’s leading producer of uranium ore since 1995 and, 

according to the Wyoming State Geological Survey, contains the largest uranium reserves of any 

state (Gregory, 2015). Uranium mining in Wyoming began in the early 1950s and peaked in 

1979–1980 (fig. 1) (Gregory, 2015; R.W. Gregory, Wyoming State Geological Survey, unpub. 

data, August 24, 2015). Since the early 1990s all the state’s production has been from in-situ 

recovery (ISR) (Wyoming State Geological Survey, 2012a). Estimates of total statewide uranium 

production are on the order of 84,000 tonnes uranium (tU) (Dahlkamp, 2010, p. 149). Remaining 

known resources are estimated at 141,000 tU at a grade of 0.065 percent uranium (Dahlkamp, 

2010, p. 149), or not quite twice what has already been produced. Based on Dahlkamp’s 

estimates, total pre-mining endowment statewide would therefore be about 225,000 tU. Similarly, 

Finch (2003, p. 4) estimates “reasonably assured resources” of 112,700 tU in Wyoming’s basins. 

Approximately one third of Wyoming’s total production came from deposits in or immediately 
2 

adjacent to the Wyoming Landscape Conservation Initiative (WLCI) study area (table 1). The 

WLCI encompasses most of southwestern Wyoming, including all of Uinta, Lincoln, Sublette, 

Sweetwater, and Carbon Counties, and only a small portion of southern Fremont County (plate 1).

Figure 1. Historic U3O8 production in thousands of pounds U3O8 (divide by 2204.623 to convert to metric 

tons and then multiply by 0.848 to convert from U3O8 to U) from the State of Wyoming. From R.W. Gregory, 

Wyoming State Geological Survey, unpub. data, August 24, 2015; Wyoming State Geological Survey, 2012b. 

Table 1. Comparison of production, resources, and endowments of each of the uranium mineralized

areas in the Wyoming Land Conservation Initiative study area.

[Numbers in red were computed by author] 

Uranium Area

Production/

Dahlkamp

(2010)

t U

Remaining

resources/

Dahlkamp

(2010)

t U

Resource Grade

Total Pre-mining

Endowment/

Dahlkamp

(2010)

t U

Production

Gregory and others 

(2010)

t ore

Reasonably 

Assured Resource

Finch

(2003)

t U

WYOMING 84,000 141,000 225,000 112,700

Ketchum Buttes NA NA NA NA 1,870

Poison Basin 350 3,000 .017 to .17 3,350 113,254

Shirley Basin 18,500 0.07 to 0.5 (mined 0.15 to 0.16) 47,000 16,399,033

CrooksGap/Green Mtn 8,000 32,000 0.12 to 0.25 40,000 4,388,463

Great Divide Basin 0.025 to 0.06 2,544,315

 Sweetwater+REB+ENQ 500 10,000

 Lost Soldier/Red Desert 17,230

 Pard 386

 Bison Basin 1,600 0.04 to 0.06 1,600

TOTAL for WLCI 27,350 23,447,321
3 

Exact resource and production values for Wyoming are unknown. Comparing values 

reported by Dahlkamp (2010) to Gregory and others (2010) and Boberg (2010) gives only a 

sense of the relative amount of ore in each of the uranium areas. Dahlkamp (2010) reports 

resources and production in metric tons (tonnes) uranium (but for ores with a wide range of 

grades it is not possible to accurately compute the tonnes of ore). Gregory and others (2010) 

report short tons of ore produced (converted to metric tons uranium for this study), but not grade 

or amount of contained uranium. Boberg reports reserves and production in metric tons U3O8 

(also converted here to metric tons uranium) but not grade or total tonnage of ore. Some reported 

quantities are ore and others are the amount of contained metal (or U3O8). The term “Resources,” 

as used here, refers to ore that is discovered and well established. These amounts do not include 

“undiscovered” resources. A quantitative resource assessment of the WLCI area is beyond the 

scope of this study. Previous resource estimates were published as part of the National Uranium 

Resource Evaluation (NURE) in the early 1980s (U.S. Department of Energy, 1980; Dribus and 

Nanna, 1982; Morris and Stanley, 1982). 

In 1979, there were 17 operating uranium mines statewide and about 25 planned for 

development (Wyoming State Geological Survey, 2012c). Prices and demand for uranium 

dropped sharply in response to the Three Mile Island incident in Pennsylvania in 1979 (Anderson 

and Van Pelt, 2015) and again in 1986, probably in response to the Chernobyl disaster in Ukraine 

(in the former Soviet Union). From 1991 until May of 2012, when the Willow Creek property in 

the Powder River Basin began operations (Uranium One, 2012), all uranium production in the 

state has been from the Smith Ranch–Highland ISR in the Powder River Basin (Gregory, 2015), 

more than 50 kilometers (km), 30 miles (mi) northeast of the WLCI study area. There were no 

recently productive mines in the study area until Lost Creek ISR came online in August of 2013 

(Ur-Energy, 2013). 

Renewed demand for uranium in the last few years increased the price and caused a 

boom in exploration and development in several areas in and immediately adjacent to the WLCI 

study area. Uranium mineralized areas (plate 1) at Ketchum Buttes, Poison Basin, Shirley Basin, 

and Great Divide Basin are nearly all within WLCI, and the southern end of the Crooks Gap–

Green Mountain mineralized area in the northeasternmost part of the Great Divide Basin 

overlaps the northern margin of WLCI. Uranium deposits in Powder River Basin (including 

Pumpkin Buttes) and Wind River Basin (including Gas Hills and Copper Mountain), many of 

which are quite large, are not in the study area. 

Outlines of the mineralized areas shown on plate 1 should be considered “fuzzy.” They 

have been modified from Gregory and others (2010) (and precursors to that map, such as Harris, 

1985), and are based on the presence of either contiguous claim blocks, continuous 

mineralization adjacent to prospective uranium properties, or suggestions of mineralization based 

on site entries in the U.S. Geological Survey’s Mineral Resources Data System (MRDS) (U.S. 

Geological Survey, 2013), or extension of geologic host units or structures. Mineralized areas are 

not exactly the same as mining districts: the latter have defined administrative boundaries. 

Geology

Several different uranium deposit types are present in Wyoming. Most of the state’s 

productive uranium deposits are in Paleocene and Eocene sandstones in Tertiary basins. These 

include roll-front type deposits and tabular sandstone-hosted deposits. Together they make up the 

vast majority of the state’s uranium resource. Other deposit types present in Wyoming include 
4 

Tertiary unconformity-related deposits and paleokarst carbonate deposits in Mississippian rocks. 

There are also subeconomic occurrences of uranium in schroeckingerite and in coal. Only the 

first two types will be discussed here. 

In the WLCI study area, most of the uranium deposits are roll-front types in Eocene 

(56–34 million years ago (Ma)) (U.S. Geological Survey, 2010) sedimentary rocks. These rollfront type uranium deposits were formed when groundwater migrated through the porous and 

permeable sedimentary rocks (sandstone and conglomerate). The groundwater leached the 

uranium from a source rock in an oxygenated environment (possibly from Precambrian igneous 

or metamorphic basement rocks, or from Paleozoic or Cenozoic volcanic ash-fall deposits

(Wyoming State Geological Survey, 2012d)) and redeposited it in a reducing environment 

(Wyoming State Geological Survey, 2012e). All the uranium areas in WLCI except Poison Basin 

and Ketchum Buttes are roll-front types in Eocene (56–34 Ma) sedimentary rocks (U.S. 

Geological Survey, 2010). 

Tabular sandstone-hosted uranium deposits are also recognized within the study area. 

Host rocks for these deposits are the Miocene North Park Formation in Ketchum Buttes (Gregory 

and others, 2010), Miocene Browns Park Formation in Poison Basin (Gregory and others, 2010), 

Eocene Wind River Formation in Shirley Basin (Gregory and others, 2010), and the 

interfingering Eocene Wasatch and Battle Spring Formations in the Crooks Gap–Green 

Mountain area (Dahlkamp, 2010). Battle Spring Formation is temporally equivalent to the Wind 

River Formation (Boberg, 2010, p. 658). North Park Formation is considered to be equivalent to 

the upper part of the Browns Park Formation (Gregory and others, 2010). 

Mining Methods

Conventional open-pit and underground mining methods were employed in the study area 

until the early 1990s. Large volumes of rock and soil containing uranium ore were mined, 

crushed, and then processed at mills to extract the uranium by solution and concentrate it into 

yellowcake (Wyoming Mining Association, 2012).

Since the early 1990s, all uranium mining has been by in-situ recovery (ISR, also called insitu leach). In an ISR operation, oxygenated water (usually with some additives) is pumped 

underground to dissolve the uranium and that solution is pumped back up to a plant on the surface. 

The solution is passed through columns or tanks loaded with ion-exchange resin. The uranium is 

chemically extracted from the resin and concentrated. The rest of the process uses the same 

methods as for conventional recovery of yellowcake (Wyoming Mining Association, 2012). 

Development of Uranium Resources

Brief visits to each of the uranium areas (plate 1) in WLCI between 2008 and 2010 

confirm that most of the sites included in MRDS (U.S. Geological Survey, 2013) have been 

inactive for decades and that the vast majority of the sites included in the database never 

produced ore. At Ketchum Buttes, there was no evidence of extensive land disturbance, past or 

present, other than a long-abandoned site on the western summit of the buttes. Several small 

abandoned mine sites and tailings piles were evident in the Poison Basin area (fig. 2). Surface 

activity in Shirly Basin and Crooks Gap–Green Mountain areas since the early 1970s has been 

mostly limited to reclamation of past mining (Harshman, 1972) although apparently companies 

are still keeping claims active (fig. 3H). 
5 

Figure 2. Decades-old waste piles left by uranium mining in Poison Basin, southwestern Wyoming, 

2008.
6 
7 
8 
9 
10 
11 
12 
13 
14 

Figure 3. Claim activity, 1976–2010. Five-year-interval time slices (3A, B, C, D, E, F, G, H) show number 

of lode claims per section. Lode claims include any locatable mineral, but it is assumed that most claims in 

and near the uranium mineralized areas or other uranium deposits are for uranium. Data from Causey, 

2007 (revised 2011).

The Nuclear Regulatory Commission (NRC) has issued permits for uranium recovery 

sites at Lost Creek (using in-situ recovery) and the Sweetwater Mill (using conventional uranium 

mining) (U.S. Nuclear Regulatory Commission, 2012a). Additional information about the Lost 

Creek project can be found on the Bureau of Land Management (BLM) website (U.S. 

Department of the Interior Bureau of Land Management, 2012a). 

Reviews of the JAB and Antelope projects in the northeastern part of Great Divide Basin 

submitted in 2008 are deferred (U.S. Nuclear Regulatory Commission, 2012b), as is the 

proposed project in Bison Basin (also known as West Alkali Creek) (U.S. Nuclear Regulatory 

Commission, 2012c). Permit requests for the Lost Soldier deposit, submitted to the NRC as a 

satellite to the Lost Creek project, was inactive as of 2012 (U.S. Nuclear Regulatory 

Commission, 2012d). 

There is a proposed project (Juniper Ridge) in Poison Basin (WISE Uranium Project, 

2012). A plan of operations (U.S. Department of the Interior Bureau of Land Management, 

2012b) and notice inviting comment until June, 8, 2012 (U.S. Department of the Interior Bureau 

of Land Management, 2012c) are posted on the BLM website. 
15 

Mines, Prospects, and Occurrences

The U.S. Geological Survey maintains a worldwide database, the Mineral Resources Data 

System (MRDS), of mineral districts, deposits, mines, prospects, and occurrences (U.S. 

Geological Survey, 2013). A subset of the data for Wyoming, along with supporting GIS data, 

was released in 2001 (Wilson and others, 2001). Compiled primarily from scientific and mining 

literature, the database is a repository for information about various deposits. In the course of the 

WLCI project, many of the records have been revised, new ones for missing properties have 

been added, and most of the unverifiable and duplicate records have been eliminated for the 

study area. Table 2 lists the verified producing and formerly producing mines and mineralized 

areas. Complete MRDS records are provided (in pdf format) for each of the 371 uranium entries 

within the boundaries of the WLCI and for the 110 verified records for productive sites in the 

adjacent Crooks Gap–Green Mountain area (appendix A) in Fremont County. These records 

augment the limited data in the ArcGIS files included in Biewick and Wilson (2014). The most 

useful field in the full MRDS record for a given mine is the reference field, which is not included 

in the ArcGIS files because it is not formatted in a compatible manner (see Biewick and Wilson, 

2014).
16 

Table 2. MRDS records for Producers or Past Producers of uranium in the study area and the tonnage of ore (in metric tons) produced.

[Districts or areas listed first, followed by sites listed alphabetically. Complete records are included in appendix A] 

DEP_ID SIG NAME COUNTY QUAD250 PRIMARY_CO SECONDARY_ TERTIARY_C OPERATION_ DEV_STATUS WGS84_LAT WGS84_LON MAS_ID MRDS_ID REC_TP tonnes ore

10205631 N Miller Hill area Carbon Rawlins Uranium - (U) Unknown Past Producer 41.40416 –107.256 560070654 Deposit > 7.75

10400480 Y Crooks Gap -

Green Mountain 

Fremont Casper Uranium - (U) Surface-Underground Past Producer 42.38995 –107.83 District 4,389,811

10400478 N Ketchum Buttes 

Uranium District

Carbon Rawlins Uranium - (U) Unknown Past Producer 41.27506 –107.396 District 1,870

10400477 N Poison Basin 

District

Carbon Rawlins Uranium - (U) Vanadium - (V) Unknown Past Producer 41.04816 –107.793 District 113,277

10400479 Y Shirley Basin 

Uranium Area

Carbon Casper Uranium - (U) Unknown Past Producer 42.33436 –106.238 District 18,080,489

10400646 Y Great Divide 

Basin Uranium 

Sweetwater Lander Uranium - (U) Unknown Producer 42.088 –108.088 District 2,805,198

10096609 N Ajo Claims Carbon Casper Uranium - (U) Surface-Underground Past Producer 42.13607 –106.466 560070180 W032735 Site 3.6

10181917 N Bald Knob Carbon Casper Uranium - (U) Unknown Past Producer 42.12106 –106.522 560070130 Site 250

10157558 Y Bison Basin 

Project

Fremont Lander Uranium - (U) Unknown Past Producer 42.28459 –108.353 560370466 DE00263 Site 62,051

10230279 N Cedar Hills 1-12 Carbon Rawlins Uranium - (U) Unknown Past Producer 41.05416 –107.774 560070140 Site 18,930

10108470 N Del Oro Carbon Rawlins Uranium - (U) Unknown Past Producer 41.2869 –107.393 DC06931 Site 1858

10157440 N Del Oro #2 

Claim

Carbon Rawlins Uranium - (U) Surface Past Producer 41.28636 –107.431 560070153 Site ?

10279171 N Jack Rabbit 

Group

Carbon Rawlins Uranium - (U) Surface Past Producer 41.04436 –107.781 560070169 Site 42,638

10157087 N Jenkins Project Carbon Casper Uranium - (U) Surface Past Producer 42.39166 –106.181 560070099 Site 479,522

10133430 N Juel Creek Sublette Lander Uranium - (U) Surface Past Producer 42.35774 –109.189 560350040 Site ?

10081134 N Ketchum Butte Carbon Rawlins Uranium - (U) Unknown Past Producer 41.286 –107.427 560070641 W032860 Site 130

10096604 N Little Man Mine Carbon Casper Uranium - (U) Molybdenum -

(MO),Copper - 

(CU),Graphite - 

(GRF)

Unknown Past Producer 42.309 –106.846 W032720 Site "a small 

shipment"

10091590 N Lone Wolf Sweetwater Lander Uranium - (U) Unknown Past Producer 42.074 –108.008 DC07330 Site 21

10018872 N Lucky Turk Sweetwater Rock 

Springs

Uranium - (U) Unknown Past Producer 41.50884 –108.802 560370062 DC07304 Site 5.4

10181711 N Nall Lease Carbon Casper Uranium - (U) Surface Past Producer 42.37409 –106.157 560070176 Site 4,445

10230604 N North Walker 

Mine

Carbon Casper Uranium - (U) Underground Past Producer 42.3264 –106.161 560070079 Site 671,423
17 

Table 2. MRDS records for Producers or Past Producers in the study area and the tonnage of ore (in metric tons) produced.—Continued

[Districts or areas listed first, followed by sites listed alphabetically. Complete records are included in appendix A] 

DEP_ID SIG NAME COUNTY QUAD250 PRIMARY_CO SECONDARY_ TERTIARY_C OPERATION_ DEV_STATUS WGS84_LAT WGS84_LON MAS_ID MRDS_ID REC_TP tonnes ore

10206596 N Pard Sublette Lander Uranium - (U) Unknown Past Producer 42.35744 –109.073 560350023 Site 386

10080431 N Petrotomics 

Mine

Carbon Casper Uranium - (U) Surface Past Producer 42.33026 –106.186 560070187 W031621 Site 8,502,326

10107762 N Platt Mine Carbon Rawlins Niobium 

(Columbium) -

Surface-Underground Past Producer 41.1183 –106.487 560070203 D001896 Site 12

10018832 N Poison Basin 

Claim Group

Carbon Rawlins Uranium - (U) Surface Past Producer 41.03952 –107.76 DC06966 Site 55,338

10281407 N Prospect 

Mountains

Sublette Lander Uranium - (U) Surface Past Producer 42.44134 –109.104 560350041 Site ?

10132282 N Shirley Basin 

Mine

Carbon Casper Uranium - (U) Surface-Underground Past Producer 42.371 –106.194 560070082 W032895 Site

10278730 N South WalkerSullivanCarbon Casper Uranium - (U) Surface Past Producer 42.30436 –106.181 560070080 Site 239,497

10133291 N State School #1 Sweetwater Casper Uranium - (U) Surface Past Producer 42.01423 –107.978 560370495 Site 203

10205128 N Sullivan Mine Carbon Casper Uranium - (U) Surface Past Producer 42.36686 –106.188 560070105 Site ?

10106208 Y Sweetwater Mill 

and Mine

Sweetwater Casper Uranium - (U) Surface Past Producer 42.05717 –107.903 560370523 W031620 Site 2,482,166

10157661 N Teton Group Carbon Rawlins Uranium - (U) Surface-Underground Past Producer 41.03936 –107.774 560070648 Site 907
18 

The following are other caveats to consider when using the MRDS records: 

1. No attempt has been made to ascertain if these sites are currently active or abandoned. 

However, presence of a record indicates that mineralization of some sort has been 

reported. 

2. All locations are points. In some cases the database contains multiple locations for a 

single record (for instance, for some mines with multiple workings, or deposits developed 

by multiple mines). MRDS does not contain an outline of mineralized ground (whether 

that is a claim, claim block, lease, deposit, or district). 

3. The term “mine” has multiple meanings. Sometimes it applies to a single working (or 

even an undeveloped claim). Other times it refers to a company’s property with many 

workings. In general, the users cannot use these coordinates to precisely locate the sites 

described by these records, but they will get to the general vicinity of the property. 

4. Accuracy and precision of site locations differ for different deposit types. As most metal 

mines are fairly compact, the locations are closer than, say, for properties hosting 

uranium accumulations (especially ISR prospects) which target an areally extensive 

deposit not exposed at the surface. 

5. More than half of the uranium records do not have a valid reference source. These are 

coded as Not-validated and are shown with small pale yellow stars on plate 1. Records of 

unknown or unnamed sites, even if they have a reference, are also coded this way. 

Records that have a valid reference are shown as darker yellow, with Producers as largest 

stars, Past Producers as medium stars, and Occurrences and Prospects small stars. 

MRDS is an active and constantly changing database. The records presented herein are 

the contents as of January 2013. Capitalization is used as an indication of what data have been 

edited. Originally, MRDS data were in all caps. Several years ago, a computer script was run on 

a few selected fields to convert upper case to initial capitals. Since then, a former MRDS team 

member who edited a record may have corrected some insignificant words such as “And,” “Or,” 

“If” to “and,” “or,” “if.” A record maintaining such apparent typos has not been revised. 

Similarly, References appearing in uppercase and lowercase have likely been revised—no 

attempt to autoconvert those to initial capitals was ever attempted. Revisions and new entries 

should be correctly displayed in uppercase and lowercase.

Mineral Claim Activity 1976 to 2010

Changes in mineral exploration through time can be seen in the mining claim data 

(fig. 3A–H). Mining claim activity on Federal land has been recorded with the BLM since it was 

required by the Federal Land Policy and Management Act of 1976 (Public Law 94-579), Sec. 

314. The claim data for WLCI were excerpted from data for Wyoming that were compiled by 

Causey (2007, rev. 2011). Claimants do not have to name the commodity that is being sought, so 

one must assume that the vast majority of claims in the uranium areas are for uranium. Likewise, 

claims outside known uranium areas but within other known mineralized areas are more likely 

for commodities known to occur in those areas, such as gold (excluding placer gold), silver, lead, 

or copper. Claim data are valid only for public lands. 

The number of open or valid lode claims are aggregated by Public Land Survey section 

(roughly 1 square mile) and plotted: green, only 1–5 claims per section; yellow, 6–25; orange 

26–50; red, greater than (>)50 (fig. 3). The maximum claim size is 600 feet (ft) × 1,500 ft (claim 

sizes were mandated by the Mining Law of 1872); therefore, only 31 maximum-sized claims can 
19 

fit in a section. Sections with more than 31 claims may have smaller or irregularly shaped claims 

or the claims were overstaked (overlapping) so as not to miss any potentially favorable ground 

due to surveying errors. The value of the claim data in this application is that it shows where 

there is the most exploration interest in any given year. Because the change in number of claims 

tends to be gradual from year to year, the series of maps (fig. 3A–H) is constructed in 5-year

increments. (The data are for 1976 to 2010, therefore the first increment from 1976 to 1980 

contains only 4 years.) 

The extent of the claims and the “hot spots” varied during these 5-year increments. In the 

eastern part of Great Divide Basin there were many claims in 1976 (fig. 3A) but very few by 

1980–1985 (fig. 3B, C) due to uranium’s price decline. The slight rebound since 2005 (fig. 3G, 

H) was due to increased price for U3O8 and advances in ISR technology. Claim activity in the 

Shirley Basin area has been less volatile—interest was highest before 1985 (figs. 3A–C) but 

many claims have remained open to the present. In the Poison Basin and Ketchum Buttes areas, 

open claims fell off gradually to 1990 (figs. 3A–D) when there were no claims in either area. By 

2000 (fig. 3F) there were several claims in the Poison Basin and increased numbers in 2005 and 

2010 (fig. 3G, H). After a 20-year absence of claims, as of 2010 (fig. 3H) there were a few 

claims on the northern edge of Ketchum Buttes. The last interest in the Miller Hill uranium area 

(approximately 2 miles northeast of Ketchum Buttes) was in 1980 (fig. 3B). A northeast-trending 

block of claims at Red Rim, west of Rawlins, is a uranium prospect. 

Uranium Mineralized Areas

Ketchum Buttes

Ketchum Buttes, last active in the 1970s(?) is virtually abandoned: only an old pit on the 

summit of the western butte is still visible. Deposits (or occurrences) in the Ketchum Buttes area 

are small (Ketchum Buttes, Cloudy Group, Del Oro, Friday, and Siwash Claims; see appendix A) 

and until recently there has been little interest in the area. Host rocks are mudstones and 

sandstones of the Tertiary North Park Formation (Vine and Prichard, 1959). These were 

sandstone-hosted roll-front type deposits containing uranophane assaying as high as 0.32 percent 

U3O8 (0.27 percent uranium equivalent) (MINOBRAS, 1976). The district produced 1,870 

tonnes (2,061 short tons) of uranium ore (Gregory and others, 2010). The average grade of the 

ore is unknown, and so too is the amount of contained uranium. Ketchum Buttes was not 

included with the Wyoming basins that were evaluated by Dahlkamp (2010). 

As of 2006, Strathmore Minerals Corporation owned the mineral rights to the Ketchum 

Buttes property. The exact location of the property (which includes 21 unpatented lode claims 

over the Foster ore body) is uncertain. Strathmore reported a near-surface uranium deposit with a 

planned conventional open-pit uranium mine. The deposit is hosted in sandstone and 

conglomerate of the Miocene Browns Park Formation. Historically demonstrated resources (not 

NI 43-101 compliant1) are 577 tU (1,500,000 pounds U3O8) (Strathmore Minerals Corporation, 

2006). Strathmore expected to develop this property as a conventional open pit, extracting the 

uranium through heap leach, or possibly processing it at the Sweetwater Mill (Strathmore 

Minerals Corporation, 2006). As of September 2009, there was no visible mineral development 

 

1

National Instrument 43-101 (NI 43-101) defines rules and guidelines for reporting and displaying information related to mineral properties 

owned by, or explored by, companies which report these results on stock exchanges within Canada in its Standards of Disclosure for Mineral 

Projects. The purpose is to ensure that misleading, erroneous or fraudulent information relating to mineral properties is not published and 

promoted to investors on the stock exchanges overseen by the Canadian Securities Authority.
20 

in the area. All of the exploratory drill holes have been plugged and the site has been 

recontoured. Late in 2012, Stathmore terminated its agreement and withdrew its plan of 

operations from the Bureau of Land Management (Mark Newman, U.S. Bureau of Land 

Management, oral commun., January 10, 2013). 

Poison Basin

At Poison Basin, old waste piles (fig. 2) and trenches (fig. 4) appear to have been 

abandoned for decades. Total production from Poison Basin district was 113,254 tonnes 

(124,867 short tons) of uranium ore (Gregory and others, 2010). Both Crosshair Exploration 

Corporation (Beahm, 2012)2

 and Strathmore Minerals Corporation (Strathmore Minerals 

Corporation, 2006, 2010) have shown recent interest in the Poison Basin area. 

Figure 4. Abandoned trench in Poison Basin, southwestern Wyoming, 2008.

 

2

Indicated Resources: 4,140,000 tonnes at 0.063 percent = 2,608 tonnes U3O8 = 2,211 tU (Beahm, 2012).
21 

Sandstone-type uranium deposits in this area were discovered in 1953 near the town of 

Baggs (population 440 as of 2010 Census) and mined from 1954 through 1981. Production came 

from eight properties and amounted to about 350 tU in ore with grades averaging 0.17 percent 

uranium (Dahlkamp, 2010). Based on these numbers a production estimate of 205,882 tonnes ore 

can be calculated, which is almost twice the 113,254 tonnes (124,867 short tons) reported by 

Gregory and others (2010)3

. Most of the mining was from open pits, but there were also some 

underground workings (fig. 5).

Figure 5. One of the small abandoned underground mines in Poison Basin, southwestern Wyoming, 

2008.

The Poison Basin deposit (including Poison Basin, Teton, and Juniper Ridge properties) 

is hosted in unoxidized and oxidized sandstones of the top 20 meters (m) of the 150-m-thick

Miocene Browns Park Formation that forms a depositional syncline cut by normal faults 

(Dahlkamp, 2010, p. 206–207). The Poison Basin deposit extends approximately 20 m below the 

 

3

Gregory and others (2010) credits the district with production totaling 113,254 tonnes (124,867 short tons) of ore: Teton Group (1,000 short 

tons, estimate = 907 tonnes), Cedar Hills (20,867 short tons = 18,926 tonnes), Teton Group (estimated 1,000 short tons = estimated 907 tonnes, 

but note that this is the same name and same tonnage and may be a duplicate record with alternate location), Poison Basin and Matt 3 (61,000 

short tons = 55,327 tonnes), and Jack Rabbit (47,000 short tons = 42,629 tonnes). 
22 

surface and consists of weakly mineralized (less than 0.1 percent) Browns Park Formation 

containing smaller, higher-grade ore bodies (averaging 0.17 percent uranium) with ore-grade 

mineralization approximately 1 to 3 m thick. Ore bodies are in a lenticular or blanket-like 

configuration and are essentially concordant with very gently dipping sediments. On the south 

side of the deposit, natural gas was encountered in drill holes in the Browns Park Formation 

(Dahlkamp, 2010, p. 207). At the Juniper Ridge4

 property, resources of 3,000 tU at an average 

grade of 0.05 percent with a cutoff grade of 0.017 percent U in three ore bodies at less than 80 m 

depth are estimated to be recoverable by open-pit mining (Dahlkamp, 2010). These data suggest

an estimate of about 6,000,000 tonnes ore. About one third of this resource is oxidized ore 

(containing the uranium-bearing minerals autunite and brannerite) above the water table 

(Dahlkamp, 2010, p. 207). A more recent evaluation estimates the indicated resource at Juniper 

Ridge at 3,754,980 tonnes at an average grade of 0.063 percent U3O8 (by using a 0.1 percent 

cutoff containing 2,003 tU (Beahm, 2012)). 

Shirley Basin

The Shirley Basin uranium area is in the northeast corner of Carbon County. Shirley 

Basin contained original resources of more than 47,000 tU at grades ranging from <0.07 to 0.5 

percent uranium (Dahlkamp, 2010, p. 176). This would compute to somewhere between 

67,000,000 to 9,400,000 tonnes of ore. According to the values reported by Gregory and others 

(2010), the seven productive mines in the Shirley Basin uranium area produced a total of 

18,080,489 short tons5 (16,399,003 tonnes) of ore. There is no mention of the average ore grade; 

therefore, total contained uranium cannot be directly compared with Dahlkamp’s estimate. 

Shirley Basin, an intermontane Tertiary basin with continental fill, is one of the smallest 

basins in Wyoming to contain roll-front type deposits. Uranium deposits occur in the Eocene 

Wind River Formation in the central part of the basin. The Wind River Formation overlies 

Precambrian to Cretaceous rocks, and it is overlain by tuffaceous silt and mudstones of the 

Oligocene White River Formation. The youngest pitchblende ore in the Shirley Basin is about 

24±3 Ma, the oldest ore sample formed before 35 Ma (Dahlkamp, 2010, p. 162). 

Ludwig (1978) subdivided uranium ore in the Shirley Basin into three types: (a) 

disseminated pitchblende ore, (b) calcite-cemented ore, and (c) massive pitchblende ore. 

Uranium content varies from 12 percent in calcite-cemented ore, 1–2 percent in disseminated 

pitchblende ore, and 65–72 percent in massive pitchblende ore (Ludwig, 1978, p. 34). These 

categories apply to most deposits in the Wyoming Basins (Dahlkamp, 2010, p. 154). 

The Shirley Basin ore bodies are not extensive in lateral dimension or tonnage. Individual 

mined ore bodies had resources between a few hundred and several thousand tonnes of uranium. 

These ore bodies rarely persisted in length along the redox front for more than 750 m, and in 

width for several tens of meters to as much as 100 m. Thicknesses (vertical to the rolls) were 

commonly a few meters, and occasionally up to 10 m. Trailing ends ranged from a few 

centimeters to several tenths of a centimeter in thickness. In-situ ore grades ranged from a few 

hundredths to 20 percent uranium (Dahlkamp, 2010, p. 179). 

 

4

Urangesselschaft USA estimated the deposit contained 8 to 15 million pounds of U3O8 (4,000 to 7,500 [short] tons) and planned to build a mine

with a 2,000 ton per day capacity (ENSR Corporation and Booz Allen & Hamilton, 2003, p. 3–57) 5

Productive mines included (values reported by Gregory and others, 2010, are in tons of ore, not contained U or U3O8): Pathfinder-Shirley Basin 

(7,170,586 short tons = 6,503,721 tonnes), Night Owl (93 short tons = 84 tonnes, small relative to the others in the area, but this mine is just east 

of the district), Uranium Supply-Jenkins (528,582 short tons = 479,424 tonnes), North Walker (740,117 short tons = 671,286 tonnes), South 

Walker (264,000 short tons = 239,448 tonnes), Getty Oil–Petrotomics (9,372,211 short tons = 8,500,595 tonnes), Nall (4,900 short tons = 4,444 

tonnes).
23 

There is current claim activity (fig. 3H) in Shirley Basin. Projects are underway by 

Crosshair Exploration and Cameco (Mark Newman, U.S. Bureau of Land Management, oral 

commun., Jan. 10, 2013)6. The major sites that are accessible have been fully reclaimed 

(fig. 6A, B) or repurposed (fig. 7A, B).

A 

B 

Figure 6. Shirley Basin, a reclaimed mine site, 2009. A, Monument. B, Surroundings to horizon. 

 

6

According to WISE-Uranium Project (http://www.wise-uranium.org/upusawy.html#PMCSHIRLEYB), “On Aug. 30, 2012, Ur-Energy notified 

the NRC of its intent to recover uranium from the Shirley Basin Project using in situ mining techniques. The company anticipates submitting a 

license amendment request to the NRC in the first quarter of 2014.” 
24 

A 

B 

Figure 7. Walker Jenkins Lake, 2009. A. Walker Jenkins Lake Public Access Area sign. B. The lake, a 

reclaimed and repurposed open-pit uranium mine in the Shirley Basin, southwestern Wyoming. 
25 

Other nearby areas with previously productive mines are the East Shirley Mountains (Ajo 

and Bald Knob, appendix A), and the Miller Hill area. Neither was of sufficient size or 

distinction to be defined as a “district” by Gregory and others (2010). 

Crooks Gap–Green Mountain Area

Gregory and others (2010) separate the Crooks Gap–Green Mountain area (plate 1) from 

the rest of the Great Divide Basin area. Dahlkamp (2010) describes the Crooks Gap area and the 

Green Mountains areas separately as being within the Great Divide Basin (along with the 

Sweetwater and the Red Desert areas). However it is defined, the Crooks Gap–Green Mountain 

area is at the extreme northeastern end of the Great Divide Basin. The most productive portion of 

the Crooks Gap–Green Mountain area is mostly a few miles north of the boundary of WLCI but 

there is not a clear boundary between the intensely mineralized area at Crooks Gap–Green 

Mountain and the rest of the Great Divide Basin. Recent exploration and potential for ISR 

development has been occurring south of the traditional Crooks Gap–Green Mountain area into 

the Great Divide Basin (as outlined on Gregory and others, 2010). Even though lode claim data 

(Causey, 2007, rev. 2011) suggest contiguous blocks of mineralized ground, the Crooks Gap–

Green Mountain area will be considered separately from the bulk of the Great Divide Basin area.

Uranium was discovered in the Crooks Gap–Green Mountain area in 1954 and mining 

continued through 1989 (Dahlkamp, 2010). According to the tonnages reported by Gregory and 

others (2010), the seven productive mines in the Crooks Gap–Green Mountain area produced a 

total of 4,388,463 tonnes of ore7

. There is no mention of the ore grade; therefore, the amount of 

contained uranium cannot be accurately estimated. Dahlkamp (2010) estimated the original 

resources (in situ and mined) on the order of 40,000 tU, some 8,000 tU of which were produced 

by 17 underground mines and open pits. Mining grades ranged from 0.12 to 0.25 percent 

uranium. Using this range of values 6,700,000 to 3,200,000 tonnes of ore were mined, which is 

consistent with the value reported by Gregory and others (2010). Dahlkamp (2010) does not list 

the 17 producing mines (other than Big Eagle Pit, McIntosh Pit, Golden Goose, and Sheep 

Mountain) so it is not possible to compare each mine directly with Gregory and others’ (2010) 

7 mines (see footnote 7). 

Most of the deposits in the district are roll-front-type uranium mineralization, although 

there are a few on the northern margin of the district (for example, Sheep Mountain and Big 

Eagle) where the mineralization is structurally controlled, stratiform, and limb-type 

(Klingmuller, 1989). In unoxidized ground, pitchblende and coffinite are the principal uranium 

minerals. In oxidized (near surface) ground there are uranyl phosphates, -silicates, -sulfates, 

and -vanadates (Dahlkamp, 2010, p. 184).

The major deposits in the Crooks Gap–Green Mountain area include Sheep Mountain 

Deposit (Dahlkamp, p. 181), Big Eagle Pit (fig. 8), McIntosh Pit, and Golden Goose, all at 

Crooks Gap, and the Jackpot (also called Round Park or Green Mountain), Phase II and Desert 

View (together called Pathfinder’s 6,900 Trend), and the Jan (or Whiskey Peak) deposits 

(Dahlkamp, 2010, p. 183). 

 

7

All values are reported here in tonnes of ore. The productive mines are (Gregory and others, 2010): Hazel and Beatrice (21 tonnes), Crooks Gap 

Mines (2,993,100 tonnes), Green Mountain (474,758 tonnes), Sundog (126 tonnes), Snowball and Pay Dirt (242,574 tonnes), Heald (6,023 

tonnes), and Big Eagle (672,315 tonnes). It is not clear exactly how each of these mines corresponds to the entries in the MRDS database.
26 

Figure 8. Big Eagle mine, currently not in use. Image from Google Earth, July 17, 2012; date of image 

unknown. 

Great Divide Basin

The remainder of Great Divide Basin includes Sweetwater (Sweetwater, ENQ, REB 

deposits), Red Desert (Lost Creek and Lost Soldier deposits), and Bison Basin areas, all 

described in Dahlkamp (2010, p. 181–192). There are four types of uranium deposits in Great 

Divide Basin: (1) roll-front sandstone-type deposits, (2) stratiform uranium concentrations 

(termed limb-type by Klingmuller, 1989), (3) surficial, caliche-type occurrences of 

schroeckingerite, and (4) uraniferous lignite or subbituminous coal (Dahlkamp, 2010, p. 181). 

Only the first two types are of economic interest for uranium and will be considered further.

Uranium production and established resources are limited to the Sweetwater/Red Desert area in 

the eastern part of the basin. According to Dahlkamp (2010, p. 181), the entire Great Divide 

Basin area contains 50,000 tU, of which 40,000 t is attributed to the Crooks Gap–Green 

Mountain area. Therefore, in spite of the large area covered, Great Divide Basin (excluding 

Crooks Gap–Green Mountain) is estimated by Dahlkamp to contain only 10,000 tU, including 
27 

about 200 tU already produced. This number is vastly underestimated and, as will be pointed out 

in this discussion, is probably closer to 24,000 to 30,000 tU. Gregory and others (2010) report a 

total of 2,544,315 tonnes8 of ore produced, of which more than 97 percent came from the 

Sweetwater mine.

The Sweetwater portion of the Great Divide Basin area is located in the central part of the 

Great Divide Basin and includes the Sweetwater, ENQ, and REB deposits. Original resources 

(in-situ and mined) of these three properties, in aggregate, were on the order of 10,000 tU at 

grades between 0.025 and 0.06 percent uranium. Only the Sweetwater deposit was mined, 

although a large resource remains. From 1981 to 1983, the Sweetwater open-pit mine produced 

about 500 tU at an average grade of 0.039 percent. Original resources were estimated at 7,300 

tU. No resource numbers have been reported for the ENQ. Resources at the REB are 1,500 tU at 

a grade averaging about 0.06 percent uranium (Dahlkamp, 2010, p. 191). 

In the northeastern part of the Great Divide Basin, in the area associated with the Red 

Desert area, the Lost Soldier deposit reportedly contains 5,642 tU (computed from Wallis, 2006) 

to 10,230 tU (Dahlkamp, 2010, p. 191–192) and the Lost Creek deposit contains 7,000 tU at 

average grade of 0.044 percent (Dahlkamp, 2010, p. 192). The earliest discovery of uranium in 

sandstones in Wyoming was in 1936 near the surface along Lost Creek, from which 

schroeckingerite ore was mined intermittently from 1954 to 1966 (Dahlkamp, 2010, p. 192). 

At the extreme north edge of the Great Divide Basin area is Bison Basin containing a 

roll-front sandstone type uranium deposit. Uranium was mined conventionally in the 1960s and 

1970s and later, in the 1980s, by in-situ recovery. There is no public record of the actual 

production. Dahlkamp (2010, p. 192) estimated remaining in-situ resources of about 1,600 tU at 

grades from 0.04 to 0.06 percent uranium (using a cutoff grade of 0.017 percent uranium). 

Finally, in the extreme northwest corner of the Great Divide Basin is the Pard Mine 

(Harris, 1997; Gregory and others, 2010) which produced 386 tonnes of ore (plate 1). Grade is 

not given, therefore the amount of contained uranium or U3O8 is not known. 

 

8

Gregory and others (2010) report 2,805,198 short tons of which 2,736,120 short tons came from the Sweetwater Mine. Dahlkamp reports 500 tU 

at 0.039 percent from Sweetwater, or 1,282,051 tonnes production, or half of Gregory and others’ value.
28 

Acknowledgments

This report is a companion to Biewick and Wilson, 2014. That report contains a complete 

GIS database from which the maps and plate in this report can be constructed. An enormous 

thank you to Laura Biewick (U.S. Geological Survey Central Energy Resources Science Center,

Denver) for ArcGIS expertise and guidance. Thanks, too, to William D. Heran (USGS Mineral 

and Environmental Resources Science Center) for field assistance and the first manuscript 

review. George Breit (USGS Mineral and Environmental Resources Science Center, retired) 

made many suggestions that substantially improved the report and Robert Gregory, Wyoming 

State Geological Survey, provided updated information, facts, and figures. 
29 

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31 

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32 

Glossary

Total endowment Tons of uranium in the ground before mining. Ideally the total tons of ore and 

the estimated grade are known. 

Mining claim Tract of public land to which an entity has claimed rights to the minerals. Most 

commonly an unpatented claim to which the mineral holder does not own the ground. Patented 

claims are lands to which ownership has been transferred to the claimant. 

Original resource The amount of the resource before production (U.S. Geological Survey, 

1980). 

Reserve The portion of an identified resource that is valuable and from which a usable mineral 

can be economically and legally extracted at the time of determination; essentially, the 

recoverable ore (U.S. Geological Survey, 1980). 

Resource A concentration of a naturally occurring commodity in such form and amount that 

economic extraction of that commodity from the concentration is currently or potentially feasible

(U.S. Geological Survey, 1980). 

Undiscovered resource Resources, the existence of which are only postulated, comprising 

deposits that are separate from identified resources. Undiscovered resources may be postulated in 

deposits of such grade and physical location as to render them economic, marginally economic, 

or subeconomic (U.S. Geological Survey, 1980). 

Yellow cake A uranium concentrate (a precipitate in a form of U3O8) produced by milling (U.S. 

Bureau of Mines, 1997). 
33 

Appendix A. Complete U.S. Geological Survey Mineral Resources Data 

System Records for All Primary Uranium Sites and Districts in Wyoming 

Landscape Conservation Initiative, Arranged by County

AppendixA_WLCI_MRDS_uranium.pdf, included, is composed of several .pdf files. 

Any errors or omissions should be brought to the author’s attention so that changes can be made to the 

original database.

Full records are available to internal USGS users at 

https://igskaccgvmmrds4.cr.usgs.gov:8443/ords/f?p=130:. A subset of this dataset is served to the 

public at http://mrdata.usgs.gov/mineral-resources/mrds-us.html. The internal dataset is the source 

of the data in the ArcGIS (Biewick and Wilson, 2014). 

For cross referencing purposes, indexes to the contents of the .pdf file are in the accompanying .xls files.

The number following the county name is the number of uranium records in that county.

Carbon_157.pdf

ApAa_Carbon_157.xls

Sweetwater_155.pdf

ApAb_Sweetwater_155.xls

Sublette_22.pdf

ApAc_Sublette_22.xls

Lincoln_24.pdf

ApAd_Lincoln_24. xls

Uinta_4.pdf

ApAe_Uinta_4. xls

Fremont_CrooksGap_110.pdf

ApAf_Fremont_CrooksGap_110.xls

Appendix B. Metadata for the U.S. Geological Survey Mineral Resources 

Data System Records in Wyoming Landscape Conservation Initiative