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Stonetree Opal Mine (WRT Stonetree claim; BLM-NMC No. 865655), WRT Stonetree group ("Dominion Opal Mine"), Virgin Valley District, Virgin Valley, Humboldt Co., Nevada, USA

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Detailed Mineral List:

Formula: SiO2 · nH2O
Reference: Sinkankas, John (1959) Gemstones of North America. Figure 30 at page 116.
Opal var: Precious Opal
Formula: SiO2 · nH2O
Reference: Sinkankas, John (1959) Gemstones of North America. Figure 30 at page 116.
Opal var: Wood Opal
Formula: SiO2 · nH2O
Reference: Christopher N. Wentzell
'Petrified Wood'
Reference: Christopher N. Wentzell


Sterrett, D.B. (1914) Gems and Precious Stones chapter in United States Geological Survey Mineral Resources U.S., for 1913. Pages 677-680, at 677.

Sinkankas, John (1959) Gemstones of North America. (D. Van Nostrand Company, Princeton, N.J.). Figure 30 at page 116.

Butler, Gail (1987)(Sept.) Opal in Virgin Valley. Rock & Gem Magazine, p. 36-38.

Castor, Stephen B. (2005) The Nevada Mineral Industry 2004. Nevada Bureau of Mines and Geology Special Publication MI-2004, University of Nevada, Reno. At page 53 under "Gemstones."

United States Geological Survey (USGS) Minerals Yearbook, 2004, Volume 2, Area Reports, Domestic; at page 30.4 under "Gemstones."

Mining Claim Files for NMC865653 through NMC865662 (WRT Pleasures & Stonetree Group claims). U.S. Department of the Interior, Bureau of Land Management, Nevada State Office, Reno, Nevada USA.

Historical documents pertaining to the Virgin Valley Mining District in the possession of Christopher Wentzell & The Wentzell Revocable Trust.

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