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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 highest point in the Little Belt Range is Big Baldy Mountain at 9,467 feet (2,886 m). The Little Belts have been mined for silver since the 1880s, and for sapphire since 1896. [1] 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]
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 Skalkaho Pass (Salish: Sq̓x̣q̓x̣ó, "many trails" [1]), 7,258 feet (2,212 m) above sea level, [2] is a pass in the Sapphire Mountains in southwest Montana traversed by Montana Highway 38.
Garnet is a ghost town in Granite County, Montana, United States. [2] A thriving mining town in the 1890s, Garnet's population declined when local hard rock mines closed. The remaining buildings have been preserved and are open to visitors.
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.
Philipsburg is a town in and the county seat of Granite County, Montana, United States. [3] The population was 841 at the 2020 census. [4] The town was named after the famous mining engineer Philip Deidesheimer, who designed and supervised the construction of the ore smelter around which the town originally formed. [5] He platted the townsite ...
Mines in Montana (10 P) Mining communities in Montana (15 P) Mining museums in Montana (1 P) Pages in category "Mining in Montana" The following 15 pages are in this ...