Deer Creek

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au; Mo; Pb; W; Zn
Ore minerals bornite; chalcopyrite; molybdenite; powellite; scheelite
Gangue minerals calc-silicates; garnet; pyroxene

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale D-3
Latitude 64.8526
Longitude -142.124
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Deer Creek prospect is at an elevation of about 4,700 feet on the ridge at the head of Deer Creek, about 0.8 mile north of hill 4886. The coordinates are the approximate center of the samples collected by the U.S. Bureau of Mines (1995), in section 4, T. 1 S., R. 28 E., of the Fairbanks Meridian. The location is accurate. The Deer Creek prospect is located within Doyon, Ltd. selected or conveyed land.

Geologic setting

Geologic description

The Deer Creek prospect consists of several, small, copper-rich, garnet-pyroxene skarn bodies in marble. The marble is interlayered within Paleozoic quartzite, argillite, and minor felsic meta-tuff (U.S. Bureau of Mines, 1995). A small Tertiary to Cretaceous granite and granodiorite body crops out about 2 miles north of the prospect. The deposit consists primarily of chalcopyrite and bornite and minor scheelite, powellite, and molybdenite. Samples collected by the U.S. Bureau of Mines (1995) contain as much as 9.81 percent copper, 0.02 percent lead, 0.23 percent zinc, 0.18 percent bismuth, 240 ppm silver, and 460 ppb gold. Near the skarns, sparse, massive, coarse-grained galena is found within silicified metatuff and quartzite; samples of this galena contain 69 to 97 ppm silver and 15 to 52 ppb gold.
There is conflicting evidence for the age of the Deer Creek prospect. Galena from the Deer Creek prospect has lead isotope ratios nearly identical to those of the Devonian Delta district massive sulfide deposits in the Alaska Range (Church and others, 1987). This suggests that the galena in the Deer Creek deposit is Devonian. However, the proximity of the deposit to Tertiary to Cretaceous plutons, the mineralogy (scheelite, powellite, molybdenite), and the trace metals (gold and bismuth) strongly suggest the Deep Creek prospect is a pluton-related Tertiary to Cretaceous skarn.
Exploration by WGM Inc. from 1975 to 1977 of the Deer Creek prospect area consisted of stream-sediment sampling, reconnaissance mapping, soil sampling on a grid, and EM, REM, CEM, and magnetic surveys (Dashevsky and others, 1986). In the early 1990s, the Deer Creek prospect was examined by the U.S. Bureau of Mines (1995).
Geologic map unit (-142.1263338082, 64.852267878448)
Mineral deposit model Cu skarn (Cox and Singer, 1986; model 18b).
Mineral deposit model number 18b
Age of mineralization Galena from the Deer Creek prospect has lead isotope ratios nearly identical to those of the Devonian Delta district massive sulfide deposits in the Alaska Range, suggesting the galena at the Deer Creek prospect is Devonian (Church and others, 1987; U.S. Bureau of Mines, 1995). However, the proximity of the deposit to Tertiary to Cretaceous plutons, the mineralogy (scheelite, powellite, molybdenite), and the trace metals (gold-bismuth) strongly suggest the Deep Creek prospect is a pluton-related Tertiary to Cretaceous skarn.

Production and reserves

Workings or exploration Exploration by WGM Inc. from 1975 to 1977 of the Deer Creek prospect area consisted of stream-sediment sampling, reconnaissance mapping, soil sampling on a grid, and EM, REM, CEM, and magnetic surveys (Dashevsky and others, 1986). In the early 1990s, the Deer Creek prospect was examined by the U.S. Bureau of Mines (1995).
Indication of production None

Additional comments

The Deer Creek prospect is located within Doyon, Ltd. selected or conveyed land. For more information contact Doyon, Ltd., Fairbanks, Alaska.

References

References

Dashevsky, S.S., Nicol, D.L., and Bond, J., 1986, Mines, prospects, and geochemical anomalies on Doyon Limited regional overselection lands, Alaska, Blocks 1-8: Doyon, Ltd. Report 86-01a, 300 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).
WGM Inc., 1977, Doyon Project, 1976 annual progress report, volume 1a, Blocks 1, 4, 5, 7, 8: Doyon, Ltd. Report 77-02a. (Report held by Doyon, Ltd., Fairbanks, Alaska).
Reporters R.L. Flynn; M.B. Werdon
Last report date 5/1/2002