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Rex; Idela Prospect, Green Monster Mountain, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
Latitude: 55°14'17"N
Longitude: 132°31'29"W
Longitude: 132°31'29"W
Geology: This prospect consists of three short caved adits and some pits and trenches that probably date from before WW I. All or most are on a large block of (14?) patented claims that extends northwest to the Green Monster Mine (CR153). The deposit consists of mineralized zones along faults in garnet-epidote-diopside skarn (Chapin, 1918; Herreid and others, 1978). The skarn is developed at the contact between Cretaceous granodiorite and Late Proterozoic or Cambrian marble of the Wales Group. The mineralized zones contain disseminations and irregular masses of magnetite, chalcopyrite, and sphalerite. One high-grade sample contained 16.0 percent copper, 2.0 percent zinc, 175 parts per million lead, and 5.1 ounces of silver per ton (Herreid and others, 1978). There is no record of production.
Workings: This prospect consists of three short caved adits and some pits and trenches that probably date from before WW I. All or most are on a large block of (14?) patented claims that extends northwest to the Green Monster Mine (CR153).
Age: Probably Cretaceous.
Alteration: Development of garnet-epidote-diopside skarn.
Commodities (Major) - Ag, Cu, Zn; (Minor) - Pb
Development Status: None
Deposit Model: Copper skarn (Cox and Singer, 1986; model 18b).
Mineral List
| Chalcopyrite Diopside | Epidote 'Garnet' | Magnetite Sphalerite |
6 entries listed. 5 valid minerals.
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References
Chapin, Theodore, 1918, Mining developments in the Ketchikan and Wrangell mining districts: U.S. Geological Survey Bulletin 662-B, p. 63-75. Herreid, Gordon, Bundtzen, T.K., and Turner, D.L., 1978, Geology and geochemistry of the Craig A-2 quadrangle, Prince of Wales Island, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 48, 49 p.
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