The White Pine copper deposit, Ontonagon County, Michigan
网页Copper, largely in the mineral chalcocite, is found in the lowermost beds of the Nonesuch shale over many square miles near White Pine, Ontonagon County, Mich. The Nonesuch shale, of late Keweenawan age, is about 600 feet …
Age and genesis of the White Pine stratiform copper …
网页2013年3月15日 · At White Pine, the stratiform sedimentary copper (SSC) mineralization occurs mostly as chalcocite in gray-black shales in the basal approximately 6 m of the 1081 ± 9 Ma Nonesuch Formation of the Keweenawan Supergroup.
网页At the now-closed White Pine Mine, the chalcocite mineralizing event was fol-lowed by a second stage of native copper deposition that demonstrates a spatial and temporal overlap of these two world-class mining districts.
网页chalcocite during main-stage mineralization, native Cu also precipitated locally, with organic matter presumably acting as a direct reductant. Later compressional faulting at White Pine provided conduits for additional cupriferous fluids; …
网页At White Pine, the stratiform sedimentary copper (SSC) mineralization occurs mostly as chalcocite in gray-black shales in the basal approximately 6 m of the 1081 9 Ma Nonesuch Formation of the Keweenawan Super-group. Paleomagnetic analysis of 176 specimens (19 sites) isolated collinear characteristic remanent magnetization
Latent volcanic heat and further unique aspects of early diagenetic ...
网页2017年11月22日 · That anomalous footwall warming is employed here to explain other unique aspects of the White Pine-Presque Isle mineralization: the abrupt downward sulfide zoning from disseminated pyrite to chalcocite across the top of the cupriferous zone; the absence of bornite and chalcopyrite in the cupriferous zone …
22. Copper Deposits in the Nonesuch Shale, White Pine, Michigan
网页The copper deposit at White Pine, Michigan, from which a little more than 5 per cent of United States primary copper currently is produced, is a large stratiform orebody, 4 to 25 feet thick and several miles across.
网页Lake Superior, Michigan, USA . Mineralized rock at White Pine covers an area of at least 250 km2 and has a total vertical extent of up to 30 m (Brown, 1971) . The principal copper minerals are native copper and chalcocite, accounting for approximately 13% and 87%, respectively, of historic mine production (Brown, 2006).
Copper mining in Michigan - Wikipedia
网页In 1955 the Copper Range Company began large-scale mining at the White Pine mine, near the old Nonesuch mine. The deposit is a stratiform deposit in the lower 15 m of the Proterozoic Nonesuch Shale and the upper 2 m of the …
Some vein-wall rock relationships in the White Pine Mine, …
网页The distribution of fractures in the White Pine mine is controlled by the dominant White Pine fault. These fractures were mineralized with calcite, quartz and chalcocite during or shortly after faulting.
- 某些结果已被删除