|If you are going out to do some rock hounding or|
prospecting, this book (available at Amazon), will
lead you right to many gem deposits with GPS
coordinates. Using this book, one person found more
than $10,000 in diamonds, another found precious
opal and yet another person found some previously
unknown ruby deposits.
|Location Map of the Cedar Rim Opal Field, Wyoming|
|The Silo sits on tons of opal. Essentially all rounded boulders and cobbles are |
opal coated by caliche.
|Hundreds of nodules in road cuts along graded |
roads in the Cedar Rim area in the White
River Formation contain opal.
|Decorative stone tile cut from massive silicified material at Cedar Rim. Specimen contains limestone clasts silicified by|
blue agate, quartz, chalcedony and common opal.
|Wayne Sutherland and Dan Hausel examine cobble of opal|
from the Cedar Rim deposit.
|Variety of agates and dendritic Sweetwater agates from the Granite Mountains, Wyoming.|
|Cabochons of common opal from Cedar Rim field.|
|Sketch map of the Cedar Rim opal field showing location of opal discoveries.|
|Transparent opal with color play from Cedar Rim|
|Fire opal from Cedar Rim. During field investigations, the author (Hausel)|
discovered an entire hill covered with fire opal. This was the first report of
fire opal in Wyoming.
(1) Cedar Rim is a giant opal field - one of the largest in the world and is found in portions of 16 square miles and likely extends beyond the area of investigation.
(2) The first verified samples of precious opal in Wyoming.
(3) The first verified fire opal in Wyoming.
(4) The first verified black opal in Wyoming.
(5) Discovery of large massive opal-agate outcrops suitable for manufacturing tile and counter tops, and
(6) source beds of Sweetwater agate.
So how can you find gemstones in Wyoming? Learn what you can about the gemstones, their physical appearance and, in particular, what kind of rock to expect to find them in. Then start outlining areas to prospect and be persistent. If you do this, you will likely find many new gemstone deposits in the Cowboy State, such as those prospectors who recently found:
(1) more than $10,000 in diamonds including one of the largest placer diamonds to be found in the Colorado-Wyoming State Line district,
(2) Diamonds in North Carolina,
(3) Ruby deposits in central Wyoming
(4) Precious opal and fire opal in the Cedar Rim deposit
(5) Many brightly colored agates in the Cedar Rim deposit
(6) Spectacular iolite, kyanite, sapphire an ruby gems at Palmer Canyon,
(7) Diamonds in anthills in the Butcherknife Draw area,
(8) Gold at South Pass,
(9) Spectrolite in the Laramie Anorthosite complex.
There are likely many opal deposits in Wyoming - essentially all unexplored. As an example, in my new 2011 book on Gold, I describe many gold deposits around the region. One of these in the Bear Lodge Mountains has the following description:
I also provide GPS coordinates to what could be a major opal fiend near Douglas Wyoming in my new Gemstone book.
- Barnes, L.C., Townsend, I.J., Robertson, R.S., and Scott, D.C., 1992, Opal - South Australia’s Gemstone: Department of Mines and Energy, Geological Survey of South Australia Handbook No.5, 176 p.
- Darragh, P.J., Gaskin, A.J., Terrell, B.C., and Sanders, J.V., 1966, Origin of precious opal: Nature, January 1, 1966, v. 209, no.5018, p.13-16.
- Darragh, P.J., Gaskin, A.J., and Sanders, J.V., 1976, Opals: Scientific American, v.234, no.4, p.84-95.
- Eckert, Allan W., 1997, The World of opals: John Wiley & Sons, Inc., New York, 448 p.
- Hausel, W.D., 1998
- Hausel, W.D., 2014
- Hausel, W.D., and Hausel, E.J., 2011.
- Hausel, W.D., and Sutherland, W.M., 2000, Gemstones and other unique minerals and rocks of Wyoming - a field guide for collectors: Wyoming State Geological Survey Bulletin 71, 268 p.
- Hausel, W.D., and Sutherland, W.M., 2006, World Gemstones: Geology, Mineralogy, Gemology & Exploration: WSGS Mineral Report MR06-1, 363 p.
- Keller, Peter C., 1990, Gemstones and their origins: Van Nostrand Reinhold, New York, 144 p.
- Kievlenko, Eugenii Ya, 2003, Geology of gems: Ocean Pictures Ltd, 432 p.
- Love, J.D., 1970, Cenozoic geology of the Granite Mountains, central Wyoming: US Geological Survey Professional Paper 495-C, 154 p.
- Sinclair, W.J., and Granger, W., 1911, Eocene and Oligocene of the Wind River and Bighorn basins: Bulletin of the American Museum of Natural History, v. 30, part 7, p. 83-118.
- Sinkankas, John, 1959, Gemstones of North America: Van Nostrand Company, Inc., New York, 675 p.
- Van Houton, F.B., 1954, Geology of the Long Creek - Beaver Divide area, Fremont County, Wyoming: USGS Geological Survey Map OM 140 map scale 1:62,500.
- Van Houton, F.B., 1964, Tertiary geology of the Beaver Rim area, Fremont and Natrona Counties, Wyoming: USGS Bulletin 1164, 99 p., map scale 1:62,500.
|Black Opal from Cedar Rim with a touch of color play.|
|Rare blue Cedar Rim opal with a touch of color play.|
|Fractured fire opal from Cedar Rim. Much of the opal and agate at Cedar rim is massive with few fractures. Only in the fire opal are fractures common.|