Jerry Creek (BT claim group)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals actinolite; calcite; epidote; garnet; quartz

Geographic location

Quadrangle map, 1:250,000-scale SP
Quadrangle map, 1:63,360-scale A-6
Latitude 67.125
Longitude -155.957
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Jerry Creek (BT) prospect is at an elevation of about 3100 feet on a ridge northwest of Avaraart Lake. It is in the N1/2 of sec. 23, T. 20 N., R. 13 E., of the Kateel River Meridian. The location is accurate to within 1000 ft. The site corresponds to locality 58 of Grybeck and Nelson (1981).

Geologic setting

Geologic description

The Jerry Creek (BT) deposit consists of stratiform, fine-grained, weakly disseminated pyrite, sphalerite, and chalcopyrite that occur over a strike distance of at least 3600 ft. The BT claim group covers three fault-bounded blocks of pelitic, volcanic, and carbonate strata which have under gone two major folding events accompanied by synkinematic metamorphism. The northern fault block consists of pelitic schist that grades upward to calcareous schist and marble; it contains a of 30-60-foot-thick horizon of intercalated feldspathic, calcareous, and graphitic pelitic schist, along with compositionally banded layers of quartz, actinolite, epidote, garnet, calcite, apatite, and actinolite. The sulfides are disseminated in the feldspathic schists and in the compositionally banded rock (Hitzman, 1978). Selected samples contain up to 0.72 percent Cu, 2.15 percent Zn, and 0.40 oz Ag/ton. BT is one of several volcanogenic deposits in the Ambler schist belt along the south flank of the Brooks Range. These deposits may be part of a rifted continental margin (Schmidt, 1981).
Geologic map unit (-155.959731813166, 67.1244685444485)
Mineral deposit model Kuroko massive sulfide (Cox and Singer, 1986; model 28a)
Mineral deposit model number 28a
Age of mineralization Host rock is Devonian-Mississippian in age.

Production and reserves

Workings or exploration Some unpublished detailed mapping and surface sampling by industry.
Indication of production None

References

MRDS Number AO11915

References

Hitzman, M.W., 1978, Geology of the BT claim group, southwestern Brooks Range, Alaska: Seattle, University of Washington, M.Sc. thesis, 80 p.
Schmidt, J.M., 1981, Volcanogenic massive sulfide deposition in a rifted continental margin--The Arctic Camp deposit, southwestern Brooks Range, Alaska [abs.]: Geological Society of America Annual Meeting, Program with Abstracts, v. 13, no. 7, p. 548.
Reporters S.W. Nelson (Anchorage, Alaska)
Last report date 9/22/1999