File:Homestake Mine gold ore, town of Lead, northern Black Hills, western South Dakota (3.6 cm acr.) (14736672692).jpg

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Homestake Mine gold ore (~1.25 cm across) - numerous visible gold blebs in high-grade gold ore sample from the Homestake Mine, town of Lead, northern Black Hills, western South Dakota, USA.

The largest gold mine in the Americas was the long-lived Homestake Mine in the town of Lead (pronounced “Leed”), South Dakota, USA. Located in the Lead Window of the northern Black Hills Uplift in western South Dakota, the Homestake Mine produced about 40 million ounces of gold. The gold at Homestake 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.

Source Homestake Mine gold ore, town of Lead, northern Black Hills, western South Dakota (3.6 cm acr.)
Author James St. John
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File:Homestake Mine gold ore closeup.jpg


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current20:31, 1 August 2014Thumbnail for version as of 20:31, 1 August 20141,193 × 571 (177 KB)TillmanTransferred from Flickr via Flickr2commons
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