|Quadrangle map, 1:250,000-scale||SP|
|Quadrangle map, 1:63,360-scale||A-6|
|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 descriptionThe 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.|
|Workings or exploration||Some unpublished detailed mapping and surface sampling by industry.|
|Indication of production||None|
Grybeck, D.J., and Nelson, S.W., 1981, Mineral deposit map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-F, 1 sheet, scale 1:250,000.
Hitzman, M.W., 1978, Geology of the BT claim group, southwestern Brooks Range, Alaska: Seattle, University of Washington, M.Sc. thesis, 80 p.
Hitzman, M.W., 1980 (1981), Geology of the BT claim group, southwestern Brooks Range, Alaska, in Silberman, M.L., Field, C.W., and Berry, A.L., eds, Proceedings of the symposium on mineral deposits of the Pacific Northwest: U.S. Geological Survey Open-File Report 81-355, p. 17-28.
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|