The total production was 193,112 tons (1,500 oz gold, 156,000 oz silver and 12,912,000 lb copper from 263,500 tons of ore) (Huntting, 1956).Ĭu 5FeS 4 - Occurs as disseminated crystals associated with other sulfides.Ĭu Fe S 2 - Occurs as disseminated crystals associated with other sulfidesĬu 2(CO 3)(OH) 2 - Occurs as secondary fibrous coatings along some fracture surfaces.ĭerkey, R. The Sunset Mine was in production from 1902 to 1905, 19 to 1930 with the years of most prolific production between 19. Chalcopyrite and bornite are the primary ore minerals. The shear zone occurs along a well-developed footwall and a diffuse hanging wall. Ore at the Sunset Mine occurs as lenses of chalcopyrite and bornite and pyrite with quartz gangue in a shear zone in graodiorite (Derkey et al., 1990, p. Intrusive rock types found within the Index Batholith range in composition from granodiorite to tonalite. Index Batholith (Oligocene) - Uplift and erosion of the Old Cascade Volcanic Arc exposed plutonic rock of the Index Batholith near Index, Washington. Minerals of the Sunset Mine, Snohomish County, Washington, USAīaring, Index District, Snohomish County, Washington, USA
0 Comments
Leave a Reply. |