Amazon Prospects, Paul Lake, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
Location: According to Maas and others (1995), the Amazon prospect is about 0.3 mile east-southeast of the mouth of Paul Lake and about 0.3 mile northeast of the center of section 6, T. 78 S., R. 89 E. Their location is used in this record. Wright and Wright (1908, figure 18) place it about 0.3 mile to the north, but that location is suspect in view of their somewhat generalized, small-scale map.
Geology: As described by Wright and Wright (1905, 1908), the Amazon prospect is a quartz-breccia vein 5 to 10 feet thick that is conformable with the bedding in calcareous schist. The workings consisted of an inclined shaft 125 feet deep with 30-foot drifts to each side of the 50-foot level. There is no record of work after 1916. Maas and others (1991) located a flooded shaft, a dump, and exposures of the vein at the surface. Three samples--dump material, rubble at the shaft, and an outcrop of the vein--contained 4,455 parts per billion gold to 0.272 ounce of gold per ton. Houston Oil and Minerals drilled at or near this prospect in the early 1980's (Oliver and Adams, 1984). The vein cuts rocks of the Wales Group of Late Proterozoic and Cambrian age (Herreid, 1967). The Wales Group rocks are folded into a large dome centered over the eastern third of Paul Lake, and consist of several marble layers 200 to 1300 feet thick, interbedded with calcareous chlorite schist and marble.
Workings: The workings consisted of an inclined shaft 125 feet deep with 30-foot drifts to each side of the 50-foot level. Houston Oil and Minerals drilled at or near this prospect in the early 1980's (Oliver and Adams, 1984).
Age: Vein is younger than the Late Proterozoic or Cambrian host rocks.
Commodities (Major) - Au
Development Status: None
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
1 entry listed. 1 valid mineral.
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Chapin, Theodore, 1916, Mining developments in southeastern Alaska: U.S. Geological Survey Bulletin 642-B, p. 73-104. Herreid, Gordon, 1967, Geology and mineral deposits of the Dolomi area, Prince of Wales Island, Alaska: Alaska Division of Mines and Minerals Geologic Report 27, 17 p. Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p. Maas, K.M., Still, J. C., and Bittenbender, P. E., 1992, Mineral investigations in the Ketchikan mining district, Alaska, 1991 - Prince of Wales Island and vicinity: U.S. Bureau of Mines Open-File Report 81-92, 69 p. Maas, K.M., Still, J. C., Clough, A. H., and Oliver, L. K., 1991, Mineral investigations in the Ketchikan mining district, Alaska, 1990: Southern Prince of Wales Island and vicinity--Preliminary sample location maps and descriptions: U.S. Bureau of Mines Open-File Report 33-91, 139 p. Oliver, D.H., and Adams, J.B., 1984, Dolomi gold project, progress report: Houston Oil and Minerals Exploration Company, 41 p. (Unpublished report held by the Bureau of Land Management, Mineral Information Center, Juneau, Alaska.) Wright, C.W., 1907, Lode mining in southeastern Alaska: U.S. Geological Survey Bulletin 314, p. 47-72. Wright, C.W., 1909, Mining in southeastern Alaska: U.S. Geological Survey Bulletin 379-B, p. 67-86. Wright, F.E., and Wright, C.W., 1905, Economic developments in southeastern Alaska: U.S. Geological Survey Bulletin 259, p. 47-68. Wright, F.E., and Wright, C.W., 1906, Lode mining in southeastern Alaska: U.S. Geological Survey Bulletin 284, p. 30-54. Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.
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Locality Updated: Cabeço de Medeiros Mine, Castrelos, Bragança, Bragança District, PortugalFrom Rui Nunes, 17th Sep 2014 11:35:02