File:Sulfidic quartz monzonite (copper ore) (Butte Quartz Monzonite, Late Cretaceous, 76 Ma; sulfide mineralization at 62-66 Ma; Butte Mining District, Montana, USA) 4.jpg

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English: Sulfidic quartz monzonite from Butte, Montana, USA.

This copper ore sample is from the famous Butte Mining District, Montana. Butte (pronounced “byoot”) is known as the “Richest Hill on Earth”. The mineralized rocks at Butte have produced gold, silver, copper, molybdenum, manganese, and other metals. This particular rock has pyrite (iron sulfide, FeS2), chalcopyrite (copper iron sulfide, CuFeS2), and bornite (copper iron sulfide, Cu5FeS4).

Rocks of the Butte Quartz Monzonite (a.k.a. Butte Pluton, Boulder Batholith, mid-Campanian Stage, late Late Cretaceous, 76.3 million years) have been intruded and altered by hydrothermal veins containing valuable metallic minerals. The copper mineralization has been dated to 62-66 million years ago, during the latest Maastrichtian Stage (latest Cretaceous) and Danian Stage (Early Paleocene).

Locality: unrecorded/undisclosed site in the Butte Mining District, northeastern Silver Bow County, southwestern Montana, USA
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Source https://www.flickr.com/photos/47445767@N05/50866234433/
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@N05/50866234433. It was reviewed on 25 January 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

25 January 2021

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current16:21, 25 January 2021Thumbnail for version as of 16:21, 25 January 20213,742 × 2,513 (8.37 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50866234433/ with UploadWizard

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