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An uncut/rough yellow sapphire found at the Spokane Sapphire Mine near Helena, Montana "Yogo sapphire" is the preferred term for gems found in the Yogo Gulch, whereas "Montana sapphire" generally refers to gems found in other Montana locations. [18] More gem-quality sapphires are produced in Montana than anywhere else in North America. [18 ...
The sapphires, called Yogo sapphires as they are mined near Yogo Creek, occur in a formation three miles (4.8 km) long and eight feet (2.4 m) across. [ 1 ] The mountains are named for a butte in the range, Belt Butte, itself named for a band of white rock which encircles it.
The mining towns of Barker, Galena Creek, and Hughesville soon sprang up in the area. [ 18 ] [ 19 ] Among the many small mining camps which were erected was Jericho, which soon went bust. [ 20 ] In July 1881, three prospectors from Barker—James LeRoy Neihart, John O'Brien, and Richard Harley [ 3 ] —discovered silver near the present-day ...
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Initial exploration of the region occurred in the 1860s with extensive workings developed at the Homestake and Little Daisy Mines between 1904 and 1925. The Homestake mine stopped only a few hundred feet from a high-grade ore body later discovered by Crown Butte Mines (a subsidiary of Hemlo Gold, a Canadian mining company) in 1989-1990 as a result of an intensive drilling campaign.
FILE - The Stillwater Mining Company, the only platinum and palladium mine in the United States, is seen near Nye, Mont., May 2, 2013. (AP Photo/Matthew Brown, File) (ASSOCIATED PRESS)
An uncut, rough yellow sapphire found at the Spokane Sapphire Mine near Helena, Montana. Sapphire is one of the two gem-varieties of corundum, the other being ruby (defined as corundum in a shade of red). Although blue is the best-known sapphire color, it occurs in other colors, including gray and black, and also can be colorless.
Mining museums in Montana (1 P) Pages in category "Mining in Montana" The following 15 pages are in this category, out of 15 total. This list may not reflect recent ...