Unnamed (on Candle Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag; Cu; Hg; Sb
Ore minerals arsenopyrite; chalcopyrite; cinnabar
Gangue minerals quartz; dolomite

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale D-6
Latitude 62.863
Longitude -155.834
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is situated in the valley of the west fork of Candle Creek at an elevation of 950 feet (290 m) in the SW1/4 sec. 15, T. 32 N., R. 35 W., of the Seward Meridian. The reporter visited the site in 1978 and in 1990.

Geologic setting

Geologic description

The prospect consists of copper-gold-silver-arsenic-, and mercury-bearing, mineralized zones that occur in plutonic rocks of the Candle Hills volcanic-plutonic complex (Bundtzen and Miller, 1997). The Candle Hills pluton yielded a K-Ar biotite age of 69.7 Ma (Bundtzen and Laird, 1983). The lode prospect occurs upslope and upstream from the rich Candle Creek placer gold deposit, which produced about 4,304 kilograms (138,377 ounces) gold to 1997 (MG002).
According to Bundtzen and Miller (1997), an ankerite-bearing alteration zone ranging from 5 to 16 meters thick can be traced for about 350 meters along a faulted (?) contact between an augite-rich, olivine monzonite and biotite quartz monzonite pluton and basaltic andesite. Thin quartz veinlets containing anomalous gold, antimony, arsenic, and mercury occur in a larger, 600 meter by 45 meter , elliptically shaped area with anomalous gold (200 ppb) and mercury (5,000 ppb) in soils. Selected samples collected by ACNC Inc. during a regional trenching and drilling program yielded values of up to 3.76 grams/tonne gold in measured drill intercepts. Nearby copper-bearing volcanics have yielded values of up to 313 ppm copper in disseminated chalcopyrite-epidote clots and stockwork veins.
Geologic map unit (-155.836354253839, 62.8623690662342)
Mineral deposit model Porphyry copper-gold (Cox and Singer, 1986; model 20c).
Mineral deposit model number 20c
Age of mineralization Inferred to be 69.7 Ma, based on a sericite age from Candle pluton (Bundtzen and Miller, 1997).
Alteration of deposit Ankerite, epidote, and sericite.

Production and reserves

Workings or exploration Exploration work by ACNC Inc. in 1989 and 1990 discovered an elliptically shaped, 600 meter by 45 meter zone of anomalous gold (up to 200 ppb) and mercury (up to 5,000 ppb) values in soils. Selected samples collected by ACNC Inc. during a follow-up trenching and drill program (totaling about 700 meters of diamond core) yielded values of up to 3.76 g/tonne gold in measured drill intercepts. ASA Inc. completed additional drilling into the prospect in 1995, but specific exploration results of these efforts are unknown.
Indication of production None
Reserve estimates None known.

References

MRDS Number 10307822

References

Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting)
Last report date 11/25/1998