Magnetite from Polk County, Tennessee, USA

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USA
Tennessee Polk County ⓘ Burra Burra Mine (Tennessee Copper Company; Copperhill Operations)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Calloway Mine	(2005) Mineral Resources Data System (MRDS), US Geological Survey. Econ Geol (1980) 75:1010-1021
Cherokee open pit ⓘ North pit	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ South pit	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Copperhill ⓘ Cherokee Mine (School property; Old Tennessee Mine)	(2005) Mineral Resources Data System (MRDS), US Geological Survey. Econ Geol (1980) 75:1010-1021
ⓘ Copperhill Mine (Eureka Mine; Isabella Mine)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Ducktown Mining District	Ross, C.S. (1935) Origin of the copper deposits of the Ducktown type in the southern Appalachian region. Professional Paper 179. US Geological Survey doi:10.3133/pp179 USGS Professsional paper 179
Ducktown ⓘ Boyd Mine (Culchote vein)	(2005) Mineral Resources Data System (MRDS), US Geological Survey. Econ Geol (1980) 75:1010-1021
ⓘ Eureka Mine	USGS PP 179
ⓘ East Tennessee Mine (Ducktown Sulphur; Copper & Iron Company)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Isabella ⓘ Isabella Mine	Schaller, Waldemar T. (1938) An unusual form of thaumasite from the Ducktown district, Tennessee. American Mineralogist, 23 (12) 876-880 USGS PP 179
ⓘ London Mine (McPherson Mine; Tennessee Copper Company)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Mary Mine (Mary-Polk County Ore Body; Cities Service Company)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
ⓘ Mill Creek Valley Staurolite locality	van Horn, F. R., 1914, Notes on a New Occurrence of Pisanite and Arsenopyrite, and some Large Staurolite Crystals from the Ducktown District, Tennessee, American Journal of Science p. 40-47.
ⓘ Polk County Mine (Mary-Polk County ore body; Tennessee Copper Company; Old Polk County; Cities Service Company)	(2005) Mineral Resources Data System (MRDS), US Geological Survey.