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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 Boston and Montana Consolidated Copper and Silver Mining Company (the "Boston and Montana" or "B&M") was a mining, smelting, and refining company which operated primarily in the state of Montana in the United States. It was established in 1887 and merged with the Amalgamated Copper Company in 1901.
Montana Agate (1969) Nebraska [45] Prairie agate (1967) Blue chalcedony (1967) Nevada [46] [47] Metal: Silver (1977); Nevada's nickname is the Silver State: Sandstone (1987) Precious Gemstone: Virgin Valley black fire opal (1987) Semiprecious Gemstone: Nevada turquoise (1987) New Hampshire [48] Beryl (1985) Granite (1985); New Hampshire's ...
Today, one can drive to and through Confederate Gulch on a passable but unimproved road. Confederate Gulch is unlike other boom and bust mining districts in Montana, because no ghost town was left at the site. The hydraulic mining during the boom years, and the reworking of the site since, has obliterated the sites of the earlier mining ...
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 ...
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.
On November 15, 1891, a spur of the Montana Central Railway reached Neihart, and a strong mining boom began. [23] Now even low-grade ore could be easily and cheaply shipped to the huge smelter in Great Falls. [25] The Panic of 1893 wiped out the area's mining economy, but the town continued to exist. [23]
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 ...