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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 owner of the only platinum and palladium mines in the U.S. announced Thursday it plans to lay off hundreds of employees in Montana due to declining prices for palladium, which is used in ...
Between 1987-1993, Crown Butte Mines (a U.S. subsidiary of the Canadian mining company, Noranda, Inc., who was in a joint venture with Hemlo Gold [4]) completed 856 drill holes comprising nearly 100,000 m of core and reverse circulation drilling and discovered three new ore deposits in the New World district. Already in November, 1990, while ...
The mine was opened in 1955 and operated by the Anaconda Copper Mining Company, and later by the Atlantic Richfield Company (ARCO), until its closure on April 22, 1982. [2] When the pit was closed, the water pumps in the nearby Kelley Mine, 3,800 ft (1,200 m) below the surface, were turned off, and groundwater began to slowly fill the Berkeley ...
[3] [23] The Galt and Broadwater mines were dug in 1883, and a year later the Ball and Mountain Chief mines were in operation. [24] The M and I, Rochester, and Silver Dyke mines also opened near Neihart. [11] Despite the area's rich ore deposits, investment in mining in the Neihart region remained low due to the expense of ore extraction.
In 2021, the Australian sapphires auction took place in Bangkok, displaying 900,000 carats of natural rough sapphire in rare colors. [2] [17] On June 8, 2023, Sotheby's "Magnificent Jewels" sale took place in New York. The largest gem-quality ruby, Estrela da FURA, was sold for $34.8 million, making it the largest and most expensive ruby ever ...
The most lucrative vein was in the Liverpool Mine, which produced over a million dollars worth of silver ore during its height of production. [3] A map of the Lump Gulch Mining District is located in the Montana Historical Society collection. [2] In 2020, the Lump Gulch Fire started in the Lump Gulch area. The result of a downed power line ...
Stalled work on a major copper mine proposed in central Montana can proceed after the state's Supreme Court ruled Monday that officials had adequately reviewed the project's environmental effects.