GUIDE TO PROSPECTING AND ROCK HUNTING IN WYOMING
WYOMING STATE GEOLOGICAL SURVEY Ronald C. Surdam, State Geologist
GUIDE TO PROSPECTING AND ROCK HUNTING IN WYOMING
by W. Dan Hausel Information Pamphlet 11 LARAMIE, WYOMING
2004
WYOMING STATE GEOLOGICAL SURVEY Ronald C. Surdam, State Geologist
GEOLOGICAL SURVEY BOARD
Ex Officio Dave Freudenthal, Governor Randi S. Martinsen, University of Wyoming Don J. Likwartz, Oil and Gas Supervisor Ronald C. Surdam, State Geologist
Appointed Ronald A. Baugh, Casper Gordon G. Marla, Laramie
John P. Simons, Cheyenne John E. Trummel, Gillee
Wallace L. Ulrich, Moose
STAFF
Computer Services Unit Jesse T. Bowen - Manager
Geologic Sections James C. Case, Senior Staff Geologist - Geologic Hazards Rodney H. De Bruin, Senior Staff Geologist - Oil and Gas Ray E. Harris, Senior Staff Geologist - Industrial Minerals and Uranium W. Dan Hausel, Senior Economic Geologist - Metals and Precious Stones Robert M. Lyman, Staff Geologist - Coal Alan J. Ver Ploeg, Senior Staff Geologist - Geologic Mapping
Publications Section Richard W. Jones - Editor/Senior Staff Geologist Jaime R. Moulton- Assistant Editor Nancy S. Ellio - Sales Manager Phyllis A. Ranz - GIS Specialist/Cartographer Joseph M. Huss - GIS Coordinator
Laboratory Unit Robert W. Gregory - Laboratory Technician
Supportive Services Unit Susanne G. Bruhnke - Office Manager Joan E. Binder - Administrative Assistant
This and other publications available from: Wyoming State Geological Survey P.O. Box 1347 Laramie, WY 82073-1347 Phone: (307) 766-2286 Fax: (307) 766-2605 Email: sales-wsgs@uwyo.edu Web Page: hp://wsgsweb.uwyo.edu
People with disabilities who require an alternative form of communication in order to use this publication should contact the Editor, Wyoming State Geological Survey at (307) 766-2286. TTY Relay operator 1(800) 877-9975.
Front cover: This 34-ounce gold nugget was reportedly found at South Pass, Wyoming, during a past gold rush. The nugget measures about 2 1/2 inches across and includes some chalcedony nodules. Several large nuggets have been found at South Pass, including one boulder that reportedly contained as much as 630 ounces of gold (see Hausel, 1991). Photograph courtesy of the Natural History Museum of Los Angeles County, Los Angeles, California.
INTRODUCTION
Welcome to Wyoming! If you have come to our state to search for gold, diamonds, agates, or other precious metals or gemstones, you will find there is a wonderful opportunity to prospect or rock hound in the Cowboy State. Wyoming contains a large variety of minerals and rocks, and new discoveries are made every year.
Many people are under the erroneous impression that everything has already been found in the state, when in fact several gemstone and gold discoveries have been made in Wyoming during the past few decades. For instance, diamonds were accidentally discovered in 1975 south of Laramie and since then a number of diamond-bearing deposits have been identified in Wyoming and Colorado. More than 130,000 diamonds (including gems weighing more than 28 carats) have been recovered along the Colorado-Wyoming border south of Laramie. Geological and mineralogical evidence indicates that many more diamond discoveries will be made in the future.
Some gold was also found in Wyoming in recent years. One of the most impressive finds during the past 50 years was the author's 1981 discovery of an entire gold district west of Casper in the Ralesnake Hills area (Hausel, 1998) (Figure 1). Following this discovery, some major mining companies and private consultants explored the district and located several other gold anomalies that led to drilling a significant, large-tonnage, low-grade gold resource at Sandy Mountain. There may be as much as 1 million ounces of gold at that site (Miller, 1999).
Several other gold discoveries were made by the Metals and Precious Stones Section at the Wyoming State Geological Survey (WSGS) during mapping projects in the historic mining districts at South Pass (Hausel, 1991), Seminoe Mountains (Hausel, 1994), Sierra Madre (Hausel, 1986), and Medicine Bow Mountains (Hausel, 1989; 1993) (Figure 2). In addition to the above lode discoveries, prospectors and treasure hunters have found many gold nuggets near some of these lodes with the use of metal detectors. A 7.5-ounce nugget was found at South Pass by a Wyoming prospector. Another treasure hunter from Fort Collins, Colorado found more than 100 nuggets at South Pass, and a prospector from Arizona recovered 399 nuggets in the Sierra Madre (Hausel and Sutherland, 2000).
1
R. 88 W. R. 89 W.
2
Tph
D
Tph
U
mg Tph
11 Aut
Aut Tt
Twb mg Tph
Aut
1
Aut
Aut
dt Tat
Aut
Tph Tph
12 Tph
Twb Tph
6 Tat
7
Twb
Aut
mg
Tph
Tph
Aut
Tph
Tph
1
1/2
0
1
1/2
0
1 mile 1 kilometer
EXPLANATION
SEDIMENTARY ROCKS Tsr Split Rock Formation Tc Boulder conglomerate Twb Wagon Bed Formation
VOLCANIC ROCKS
Tph Phonolite Tat Alkali meta-trachyte Tst Soda trachyte Tt Trachyte Tl Latite Tql Quartz Latite
INTRUSIVE METAIGNEOUS ROCKS
mg Metagabbro dt Tonalite gr Granodiorite ap Aplite
Tph
14
Asb
mg
mg 13 Asb
Tph
mg
Aut Tph Tst
Tst mg
Twb
18
Aut
Twb
mg 17
mg
Aut
Aut mg
mg
16 Aut
Aut
Tc
Twb mg
mg
15
Twb
gar p
Goat Mountain
Asb
Tl Tl
Tl
Aut
Tph
Tst
Tl
Tph Tph Twb Sandy Mtn. mg
Tph
Tph
Tt
mg Asb
mg Asb
23
24
Tst 19
mg mg
Aut Tst
Tst
Aut
Twb
Tl
Amb mg
mg
Asb 20
mg
Twb
Tc
Lost Muffler adit Tc 21
Aut Twb Tc
UT CREEK FAULT
ap Aut Asb
22
Tl
Tst
Oshihan Hill
Bmb
Tph Twb Twb
26 mg
Gu
mg Amb
25 Tst Bmb Tsr
mg
Amb
Tsr
U
D 30
Aut
29
Tsr Tql Tql Tsr
28
Tph
Aut
Tql
27
Tsr Tph
23 LOST MUFFLTEwRbFAULT
Aut
26
UT CREEK FORMATION
Asb Metabasalt Aut Metagreywacke
McDOUGAL GULCH METAVOLCANICS Amb Metabasalt and ultramafic schist
BARLOW SPRINGS FORMATION
Bmb
Metabasalt, banded iron formation, quartzite, pelitic schist; metafelsite, and
tremolite-chlorite schist.
GRANITE GNEISS COMPLEX
Gu
Undifferentiated granitoids, gneissic breccia, granite, felsic gneiss, and
amphibolite gneiss.
U Fault D
Twb 25
2
Twb
Tsr
Gu
31
32
35
36
33
COTTONWOOD Tsr
CREEK
FAULT
Aut
Tsr
34
35
Tsr
Aut
Aut 36 Tsr U D
U D
T. 32 N.
Figure 1. Generalized geologic map of the Rattlesnake Hills gold district (from Hausel, 1996b).
111
110
109
108
107
106
105
104
3
45
EXPLANATION
Eocene Absaroka Volcanic Supergroup
Tertiary intrusive rocks
Precambrian igneous and metamorphic rocks
Mullen Creek ? Nash Fork Shear Zone
YELLOWSTONE NATIONAL PARK
EAGLE CREEK PORPHYRY
Mineralization
ROBINSON CREEK
44
PORPHYRY
BMeaorutonotatihns NEW WORLD (COOKE CITY)
SUNLIGHT
BIG HORN
BALD MOUNTAIN
Sheridan
WALKER MOUNTAIN SHERIDAN
Absaroka
Volcanic Plateau
Cody
Bighorn
CLOUDS HOME
PEAK PORPHYRY
PARK
Basin
Greybull
GOOSE CREEK
DEER CREEK PORPHYRY
Bighorn
Mountains
Buffalo
KELLY CREEK
STINKINGWATER
Worland
HAZLETON PEAK
45
CAMPBELL
CROOK
BEAR LODGE MOUNTAINS
Black Hills uplift
Sundance
MINERAL HILL
Gillette
Powder
BLACK BUTTES
Teton Range
Jackson Hole
TETON
Jackson
Gros Ventre Range
Hoback Basin
KIRWIN
WASHAKIE
HOT SPRINGS
Thermopolis
Owl Creek-Bridger
Mountains
COPPER
MOUNTAIN
FREMONT
JOHNSON
Bighorn Mountains
NATRONA
River Basin
CONVERSE
Newcastle
WESTON
NIOBRARA
43
Pinedale
Wind River
Range
Wind River
Riverton
Lander
Basin
Casper arch
RATTLESNAKE HILLS
Casper DEER CREEK
Douglas
MUSKRAT CANYON
Lusk
SUBLETTE
TIN CUP
CASPER MOUNTAIN
LaPRELE
RAWHIDE BUTTES
LAKE ALICE Green
SOUTH PASS
Granite Mountains
Shirley Basin
WARBONNET
ESTERBROOK Hartville uplift
PLATTE
WILDCAT HILLS
McCANN PASS
LINCOLN
River
GREENSTONE BELT
MINERS CANYON
Laramie
HAYSTACK RANGE
Overthrust Belt
42
Kemmerer
Moxa arch
Basin
Rock
Great Divide Basin
LEUCITE HILLS
SEMINOE
MOUNTAINS Hanna
CARBON
Basin
Mountains
IRON MTN. TITANIFEROUS
Rawlins
ELK
MAGNAELTBIATNEY LAPLATA
Wheatland Torrington
ELMERS ROCK GREENSTONE
BELT
IRON MTNG.OSHEN
Rock Springs Green River
Springs uplift
LAMPROITES
MOUNTAIN
NEW RAMBLER GOLD
MINE
HILL
COOPER HILL Laramie
KIMBERLITES
STRONG MINE Denver-
UINTA
Evanston NORTH
41
KIMBERLITE
INDICATOR MINERALS
SWEETWATER
SCALE
0
10 20 30 40
Washakie Basin
50 Miles
BIG CREEK
Basin CENTENNIAL
ENCAMPMENT Sierra
Medicine Bow
RIDGE
Laramie
KEYSTONE LAKE CREEK JELM MTN.
Madre Mts.
COPPER
Cheyenne Basin
SILVER CROWN
Cheyenne LARAMIE STATE LINE
41
RIDGE
111
104
Figure 2. Principal mineralized regions and mining districts in Wyoming (modified from Hausel, 1997).
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