Dew Drop (ARDF #CR032) Ag, Au, Cu, Pb, Zn

Dew Drop

Prospect, Probably inactive

Alternative names

Rose

Commodities and mineralogy

Main commodities	Ag; Au; Cu; Pb; Zn
Ore minerals	chalcopyrite; galena; pyrite; sphalerite
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	CR
Quadrangle map, 1:63,360-scale	C-3
Latitude	55.51982
Longitude	-132.80543
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	The prospect on the Dew Drop and Rose claims is about 0.2 mile southeast of peak 2944 at an elevation of about 2,800 feet; it is about 0.4 mile south of the center of section 21, T. 73 S., R. 83 E.

Geologic setting

Geologic description The Dew Drop and Rose claims are on a quartz vein in metamorphosed volcanic rocks near the contact of the Luck Creek Breccia and the Descon Formation, both of Silurian and Ordovician age (Eberlein and others, 1983; Brew, 1996). The vein contains galena, pyrite, and chalcopyrite (Wright and Wright, 1905, 1908; Wright, 1906, 1907; Herreid and Rose, 1966) The vein is 6 to 14 inches thick; it strikes N60W and dips 85SW. Maas and others (1991) located a 21-foot adit on the prospect but found no sign of mineralization or quartz veins; the highest gold value in their samples was 477 parts per billion. They did, however, find a possible extension of the Lucky Nell vein (CR031) about 500 feet northwest of the Dew Drop prospect; it consists of a 0.5- to 1.0-foot-wide vein with about 70 percent pyrite, sphalerite, galena, and chalcopyrite. Three samples across 0.67 feet of vein averaged 1.25 ounces of gold per ton, 126.9 ounces of silver per ton, 5.22 percent lead, and 2.38 percent zinc.
Geologic map unit	(-132.807076067003, 55.5194616120163)
Mineral deposit model	Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number	22c
Age of mineralization	Unknown, other than that the vein is in Silurian or Ordovician volcanic rocks.

Production and reserves

Workings or exploration	Some prospecting and at least one short adit.
Indication of production	None
Additional comments The prospect is in the Karta River Wilderness, which is closed to prospecting and mining.

References

MRDS Number	A010037
References Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000. Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-869, 262 p. Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p. Herreid, Gordon, and Rose, A.W., 1966, Geology and geochemistry of the Hollis and Twelvemile Creek area, Prince of Wales Island southeastern Alaska: Alaska Division of Mines and Minerals Geologic Report 17, 32 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., 1 sheet, scale 1:20. 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: U.S. Bureau of Mines Open-File Report 33-91, 139 p., 12 sheets, scale 1:63,360. Wright, C.W., 1906, Lode mining in southeastern Alaska, in Brooks, A.H., Report on Progress of Investigations of Mineral Resources of Alaska in 1905: U.S. Geological Survey Bulletin 284, p. 30-54. Wright, C.W., 1907, Lode mining in southeastern Alaska, in Brooks, A.H., and others, Report on progress of investigations of mineral resources of Alaska in 1906: U.S. Geological Survey Bulletin 314, p. 47-72. Wright, F.E., and Wright, C.W., 1905, Economic developments in southeastern Alaska, in Brooks, A.H., Report on Progress of Investigations of Mineral Resources of Alaska in 1904: U.S. Geological Survey Bulletin 259, p. 47-68. Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.
Reporters	D.J. Grybeck (Applied Geology)
Last report date	5/1/2004