File:Homestake Mining Company - 9 (0-4-0CA) (22814552470).jpg

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This small locomotive was once used at a gold mine by the Homestake Mining Company in the town of Lead, South Dakota, USA. Lead (pronounced "Leed") is located in the northern Black Hills. The largest gold mine in America operated there for many decades - the Homestake Mine. This 0-4-0CA mine locomotive was built in 1907 by the H.K. Porter Company. Unlike most early locomotives, which were wood-burning or coal-burning steam engines, Homestake Mining Company # 9 was powered by compressed air ("CA" in the model designation stands for "compressed air"). This engine headed trains of ore cars at the mine.

The Homestake Mine produced about 40 million ounces of gold. The gold is almost exclusively confined to the Homestake Formation, a Paleoproterozoic (~1.9-2.0 billion years) sedimentary unit that originally consisted of interbedded Mg-rich siderite iron formation and marlstones. The Homestake Formation has been strongly deformed & multiply metamorphosed, and many of the original rocks were converted to greenschists (cummingtonite schists). The gold has been interpreted as having been originally deposited with the iron formation sediments by seafloor volcanogenic exahalative processes. Slight metamorphic gold mobilization and tight structural folding has resulted in the formation of auriferous greenschist pods along fold axes.

This old mine engine is on display at the Black Hills Mining Museum in Lead, South Dakota.

For photos of Homestake Mine gold ores, see:

<a href="https://www.flickr.com/photos/jsjgeology/albums/72157645898097612">www.flickr.com/photos/jsjgeology/albums/72157645898097612</a>
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Source Homestake Mining Company # 9 (0-4-0CA)
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@N05/22814552470 (archive). It was reviewed on 7 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 March 2020

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current04:55, 7 March 2020Thumbnail for version as of 04:55, 7 March 20204,073 × 2,436 (3.46 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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