	*(1933) Metalliferous deposits of the greater Helena mining region, Montana. Bulletin* Vol. 842. US Geological Survey doi:10.3133/b842**	Report (volume)
	Director Bulletin 842 OF THE GREATER HELENA MINING REGION MONTANA BY J. T. PARDEE and F. C. SCHRADER...______________________-__-_________--_------___-_ Ophir district.________________________________________________...__________---__--_-___ Austin district._.____..._..._._.____._____.____.___-.___._____ Marysville district.___________...___________________________________________ Gould district._______________________________________________ Stemple...._ Heddleston district.___________________________________________ Wolf Creek district.._..........__
	Tysdal, Russell G., Ludington, S.D., McCafferty, Anne E. (1996) Mineral and energy resource assessment of the Helena National Forest, west-central Montana. Open-File Report Vol. 1996 (96-683) US Geological Survey doi:10.3133/ofr96683a	Report (issue)
	was discovered in the region in Powell County in 1852. Mining began in the 1860's, and since then the...References cited F. Mineral resource geology of mining districts/areas Lincoln Region by R.G. Tysdal,...G. Tysdal, E.A. du Bray, and J.W. Whipple York district Geologic setting Mineral deposits Sediment-hosted...Exhalative, Au iii Vein, Au-bearing Confederate Gulch district and Southern Big Belt area Geologic setting Mineral...(Ogden Mountain) district McClellan Gulch district Stemple-Gould district Finn district Marysville (Silver
	*(1992) Area Reports: Domestic. Vol 2. Minerals Yearbook 1990, Bureau of Mines.*	Report (Issue volume)
	of nonfuel minerals and a chapter on trends in mining and quarrying in the metals and industrial mineral...State mineral production and mineral production by county were prepared in the Division of Statistics and...and Natural Resources of the State of Hawaii. Idaho: Idaho Geological Survey. Illinois: State Geological... . . . . . . . . . . . . . . . . . • . . . 155 Idaho, by Rodney J. Minarik and V. S. Gillerman . . ....which 329), which placed the collection of min- Mine Safety and Health Administration), eral statistics
	*O'Donoghue, Michael - Ed.* (1976) The Encyclopedia of Minerals and Gemstones. Orbis Publishing Ltd.**	Book
	protons symbolized here by an atomic nucleus keep to fixed orbits. Let Each into ‘shells’ cloud...in the electrical charges of their protons, which keep them comparatively far apart by mutual repulsion...and If we melt a mixture of allow the melt to cool, the crystals that form are no longer of forsterite...metal and sulphur in a variety frequently phides mining that of structures, covalent than will you...want to check this, you will have to visit a salt mine; halides are dissolved by groundwater if they are
	*Emsley, John (2001) Nature's Building Blocks* - An A-Z Guide to the Elements. Oxford University Press, Oxford.**	Book
	Illinois, for telling me about the Minesota copper mine in Michigan. Albert Cotton informed me of the further...but in the USA it is spelt aluminum; • caesium is the preferred spelling, but in the USA it is spelt...is formed from ^ This is the same as 154 pounds (USA) or 11 stone (UK). 6 INTRODUCTION calcium and...for the totals of the capitalist economies. World mining and production of the most important metals* Ranking...percentages (or frac¬ tions of a per cent). In the USA the common units of weight are ounces and pounds

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Boulangerite from Keep Cool Mine, Lakeview Mining District, Bonner County, Idaho, USA

Boulangerite from
Keep Cool Mine, Lakeview Mining District, Bonner County, Idaho, USA