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Geological Engineering Commons

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Geochemistry

2018

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Full-Text Articles in Geological Engineering

Mineralogy And Sulfur Isotope Geochemistry Of The Apex And Bonanza Prospects At The Golden Sunlight Mine, Montana, Hamadou Gnanou Apr 2018

Mineralogy And Sulfur Isotope Geochemistry Of The Apex And Bonanza Prospects At The Golden Sunlight Mine, Montana, Hamadou Gnanou

Graduate Theses & Non-Theses

The Golden Sunlight mine, located 50 km to the east of the famous Butte porphyry/lode deposits, is the largest gold mine in Montana, and has produced over 3 million ounces of gold in its 35+ year history. Most of this gold has come from the Mineral Hill breccia pipe (MHBP), a west dipping, cylindrical body of brecciated latite and country rock fragments of the Precambrian LaHood and Greyson Formations. The breccia pipe is late Cretaceous in age (84±18 Ma, DeWitt et al., 1986), is silicified, pyrite-rich, and is mineralized with gold, silver, and minor base metals. Because the ...