File:Granite Mountain Mine headframe (Butte, Montana, USA) 3.jpg
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English: The town of Butte, Montana (pronounced “byoot”) is known as the “Richest Hill on Earth” and "The Mining City". The Butte Mining District has produced gold, silver, copper, molybdenum, manganese, and other metals.
The area's bedrock consists of the Butte Quartz Monzonite (a.k.a. Butte Pluton), which is part of the Boulder Batholith. The Butte Quartz Monzonite ("BQM") formed 76.3 million years ago, during the mid-Campanian Stage in the Late Cretaceous. BQM rocks have been intruded and altered by hydrothermal veins containing valuable metallic minerals - principally sulfides. The copper mineralization has been dated to 62-66 million years ago, during the latest Maastrichtian Stage (latest Cretaceous) and Danian Stage (Early Paleocene). In the supergene enrichment zone of the area, the original sulfide mineralogy has been altered. From a brochure on Butte area mines: GRANITE MOUNTAIN MINE 1887-1944 3700 Feet Deep When first installed, the hoist at the Granite Mountain was the largest in the world. Connected to the Speculator, located 200 yards to the south, the Granite Mountain was developed to bolster the productive capacity of its parent mine. Instead, it nearly destroyed it. The disastrous Speculator fire of 1917, the worst hard-rock mining accident in the history of the United States, actually began in the shaft of the Granite Mountain. Once ignited, it was only a matter of minutes before the entire lower half of the shaft was engulfed in flames with deadly smoke and gas permeating miles of underground workings. Those who could, battered down concrete bulkheads that separated the tunnels of this mine from those of adjacent shafts. Many of the men escaped through the Badger and the Diamond. One hundred and sixty-three were not so fortunate. "It was about midnight when I heard someone shouting 'fire!' My partner and I were working a short distance away from the 2600 foot station. We went out to investigate. The shaft was like a roaring furnace." Butte miner, June 10, 1917 Locality: Granite Mountain Mine, Butte Mining District, northeastern Silver Bow County, southwestern Montana, USA |
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| Source | https://www.flickr.com/photos/47445767@N05/50882765062/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50882765062. It was reviewed on 28 January 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 14:42, 28 January 2021 | | 3,008 × 2,000 (5.07 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50882765062/ with UploadWizard |
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