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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 ...
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.
Pages in category "Mining communities in Montana" The following 15 pages are in this category, out of 15 total. This list may not reflect recent changes. B.
The south-central Montana mine complex includes the Stillwater West and Stillwater East operations near Nye, and the East Boulder operation south of Big Timber. It has lost more than $350 million ...
Mar. 19—Flathead Valley landowners and neighborhood advocates are among those opposing a bill in the Montana Senate that would ease regulations on open-pit gravel mining. House Bill 599 ...
Pages in category "Mining in Montana" The following 15 pages are in this category, out of 15 total. This list may not reflect recent changes. A. Alder Gulch;