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File:Broken drill core (Butte Mining District, Montana, USA) 1.jpg

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English: This broken drill core is part of the Granite Mountain Memorial in the town of Butte, Montana. Butte 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 copper 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.

In this rock, the brassy-colored material is pyrite. The greenish material is probably malachite, a secondary copper carbonate mineral.
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Source https://www.flickr.com/photos/47445767@N05/50974736683/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50974736683. It was reviewed on 24 February 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

24 February 2021

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current14:57, 24 February 2021Thumbnail for version as of 14:57, 24 February 20212,939 × 1,992 (3.91 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50974736683/ with UploadWizard

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