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Featured researches published by Richard B. Berg.


Clays and Clay Minerals | 1986

Clinochlore from the Silver Star District, Madison County, Montana

Richard B. Berg

Almost monomineral ic clinochlore is mined at the Golden Antler mine, about 40 km southeast of Butte, Montana, in the Silver Star district, a district where gold, silver, copper, and lead were formerly mined. The chlorite mine is in the SWI/4 sec. 14, T2S, R6W, in Madison County and is leased by Cyprus Industrial Minerals Company. The author identified clinochlore from this deposit in 1975, and open-pit mining on a small scale began in 1977 (Berg, 1983). The light-colored and high-grade nature of the clinochlore from this deposit allows it to be used in some of the same applications as talc. The present note reports the physical and chemical properties of this unusual chlorite mineral.


Lithos | 2017

Melt inclusions in alluvial sapphires from Montana, USA: Formation of sapphires as a restitic component of lower crustal melting?

Aaron C. Palke; Nathan D. Renfro; Richard B. Berg


Lithos | 2016

Origin of sapphires from a lamprophyre dike at Yogo Gulch, Montana, USA: Clues from their melt inclusions

Aaron C. Palke; Nathan D. Renfro; Richard B. Berg


Economic Geology | 2006

THE SILVER BOW SAPPHIRE OCCURRENCE, MONTANA: EVIDENCE FOR A VOLCANIC BEDROCK SOURCE FOR MONTANA’S ALLUVIAL SAPPHIRE DEPOSITS

Aaron L. Berger; Richard B. Berg


Mine Water and The Environment | 2006

Summary of Deepwater Sediment/Pore Water Characterization for the Metal-laden Berkeley Pit Lake in Butte, Montana

Larry G. Twidwell; Christopher H. Gammons; Courtney Young; Richard B. Berg


GSA Annual Meeting in Denver, Colorado, USA - 2016 | 2016

SAPPHIRES FROM AN EOCENE SILL NEAR HELENA, MONTANA

Richard B. Berg; Aaron C. Palke


Open-File Report | 1998

Map showing areas with potential for talc deposits in the Gravelly, Greenhorn, and Ruby ranges and the Henrys Lake Mountains of southwestern Montana

Bradley S. Van Gosen; Richard B. Berg; Jane M. Hammarstrom


Archive | 1987

Geology of the Butte mining district, Montana

Lester G. Zeihen; Richard B. Berg; Henry G. McClernan


Gems & Gemology | 2018

Gemological Characterization of Sapphires from Yogo Gulch, Montana

Nathan D. Renfro; Aaron C. Palke; Richard B. Berg


Northwest Geology | 2007

Talc in southwestern Montana

M. T. Cerino; J. F. Childs; Richard B. Berg

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Aaron C. Palke

Gemological Institute of America

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Nathan D. Renfro

Gemological Institute of America

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Bradley S. Van Gosen

United States Geological Survey

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Jane M. Hammarstrom

United States Geological Survey

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Christopher H. Gammons

Montana Tech of the University of Montana

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Courtney Young

Montana Tech of the University of Montana

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Larry G. Twidwell

Montana Tech of the University of Montana

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