File:Chalcopyrite-pyrrhotite (Late Cretaceous; Cable Mine, ~1.4 miles east of Georgetown, Deer Lodge County, western Montana, USA) 2.jpg

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English: Chalcopyrite-pyrrhotite mass from the Cretaceous of Montana, USA (5.6 cm across at its widest).

This is a sulfide mass from a replacement deposit (gold-copper contact metamorphic deposit) at Montana's Cable Mine. The rock principally consists of chalcopyrite (CuFeS2 - copper iron sulfide) and pyrrhotite (Fe1-xS - imperfect iron monosulfide). The latter mineral is basically magnetic fool's gold. Secondary minerals coat this specimen in places.

The Cable Mine is a gold mine started in the 1860s. It targeted macroscopic and microscopic native gold mixed with quartz, calcite, sulfides, and other minerals. The ore body at this mine is in a large, ~tabular mass of calcitic marble, which is metamorphosed dolomitic limestone of the Upper Cambrian Hasmark Formation. The limestone was contact metamorphosed into ore-bearing marble by the intrusion of the Cable Batholith, a Late Cretaceous granodiorite unit. The marble mass is almost completely surrounded by granodiorite, and is likely a roof pendant of that intrusion. Ore mineralization apparently accompanied the formation of marble from dolomitic limestone. Ore formation involved metasomatism - the introduction of elements from hydrothermal fluids emanating from the granodiorite magma.

Locality: Cable Mine (a.k.a. Atlantic Cable Mine), near the head of Cable Creek, southern slopes of Cable Mountain, ~1.4 miles east of Georgetown, Georgetown Mining District (Southern Cross Mining District; Cable Mining District), northwestern Deer Lodge County, western Montana, USA
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Source https://www.flickr.com/photos/47445767@N05/15747657728/
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@N05/15747657728 (archive). It was reviewed on 22 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 December 2019

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current18:18, 22 December 2019Thumbnail for version as of 18:18, 22 December 20192,236 × 2,256 (1.83 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

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