28-6-071: altered gneiss - Cripple Creek District - Grassy Valley Mine

Details

Specimen Number28-6-071Alternate NumberJR-97-68Commentsfrom Crowe research collection; J. Rosdeutscher MS materialsIn Teaching CollectionNoMineral(s)kaoliniteplagioclasesericiteField Notesaltered biotite gneiss, strongly sericitizedRock Namealtered gneissDistrictCripple CreekMineGrassy ValleyGeo-LocationDDHGVC-8 310.5ft.Deposit TypeDiatremeGeo-Coords^[1]Reference MaterialRosdeutscher, J.A., 1999, Geology and Stable Isotope Geochemistry of the Grassy Valley Au Deposit, Cripple Creek District, Colorado: Evidence for Magmatic Fluids; University of Georgia MS thesis, 76 p.

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28-6-071: altered gneiss - Cripple Creek District - Grassy Valley Mine

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28-6-071: altered gneiss - Cripple Creek District - Grassy Valley Mine