Croesus

Prospect, Undetermined

Commodities and mineralogy

Main commodities Au
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-1
Latitude 55.15317
Longitude -132.17583
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Croesus prospect is east of the head of Kitkun Bay at an elevation of about 900 feet. It is 0.3 mile west of hill 1305 and about 0.5 mile east-northeast of the center of section 32, T. 77 S., R. 88 E.

Geologic setting

Geologic description

The Croesus prospect was discovered prior to 1902 and by 1908, two tunnels, one 350 feet long and the other 135 feet long, had been driven on a quartz vein that strikes north and dips 85E (Brooks, 1902; Wright and Wright, 1908; Maas and others, 1991). The workings also include a 20-foot adit, a caved shaft, and at least one trench. Some rich ore was found but the ore streaks are small and faulted (Brooks, 1902; Wright and Wright, 1908; Smith, 1914; Bufvers, 1967). The rocks in the vicinity consist of greenschist and marble of the Wales Group of Late Proterozoic and Cambrian age (Eberlein and others, 1983; Brew, 1996). Apparently, there was no further exploration work after 1913. Maas and others (1991) collected 22 samples. Their highest gold value was 0.624 ounce per ton across 5.2 feet; there were a considerable number of assays above 0.3 ounce of gold per ton, but the other metal values were uniformly low. Based on extensive soil sampling, Hedderly-Smith (1999 [Inventory]) suggests that the veins may extend for about 1,000 feet along strike and that the mineralization is probably more extensive than previously recognized.
Geologic map unit (-132.17749278667, 55.1528150422723)
Mineral deposit model Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a
Age of mineralization Veins are younger than the Late Proterozoic or Cambrian host rocks.

Production and reserves

Workings or exploration One vein was explored by a 135-foot tunnel and a 350-foot tunnel. The workings also include a 20-foot adit, a caved shaft, and at least one trench. Sampled by government and industry geologists in the late 1980s.
Indication of production None

References

MRDS Number A010093

References

Hedderly-Smith, D.A., 1993, Report of the 1992 work in the Brennan Bay-Kitkun Bay area-Sealaska minerals reconnaissance project: Sealaska Corporation, 24 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1993, Report of the 1993 work in the Brennan Bay-Kitkun Bay area-Sealaska minerals reconnaissance project, Sealaska Corporation, 45 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1996, Report of the 1994 and 1995 work in the Kitkun Bay area-Sealaska minerals reconnaissance project: Sealaska Corporation, 83 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1997, Report of 1996 work in the Kitkun Bay area-Sealaska minerals reconnaissance project: Sealaska Corporation, 29 p. (Unpublished report held by the Sealaska Corporation, Juneau, Alaska.)
Hedderly-Smith, D.A., 1999, Inventory of metallic mineral prospects, showings and anomalies on Sealaska lands, 1988 through 1998: Sealaska Corporation, Juneau, Alaska, 217 p. (internal report held by Sealaska Corporation, Juneau, Alaska).
Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004