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Pilgrim

Prospect, Undetermined

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Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities Zn
Ore minerals chalcopyrite; pyrite; sphalerite
Gangue minerals actinolite; epidote; garnet

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale D-5
Latitude 67.7544
Longitude -149.0175
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Pilgrim prospect is about 5.8 miles at an azimuth of 20 degrees from the central (5425) peak of Horace Mountain and about 0.4 mile south-southwest of peak 5150. It about 0.5 mile south-southwest of the center of section 24, T. 34 N, R, 7 W. Kurtak and others (2002) include a map showing the regional geology of the area and the location of this and the other deposits of the Chandalar Copper Belt.

Geologic setting

Geologic description

The Pilgrim prospect was staked by Placid Oil Company in 1972 and explored by them until 1977 (Kurtak and others, 2002). It was also one of the prospects listed in a report by Ventures Resources Corp. (1999) about their exploration of the Chandalar Copper Belt.
The Pilgrim prospect is at the northeast end of the Chandalar Copper Belt. The rocks in the vicinity are mainly lower Paleozoic greenschist, calcareous schist, and marble, in thrust contact with Devonian Hunt Fork Shale and Silurian and Devonian, Skajit Limestone (Brosgé and Reiser, 1964). A sample with garnet, epidote, actinolite, pyrite, sphalerite, and chalcopyrite contained 12.4 percent copper, 0.24 percent zinc, and 71 parts per million silver (Newberry and others, 1986). WGM Inc. (1980) identified coarse-grained pyrite and chalcopyrite in quartz-sericite schist and chlorite schist; grab samples contained up to 3.8 percent copper. Kurtak and others (2002) found similar mineralization in sericite-quartz schist and as well small amounts of disseminated chalcopyrite, and pyrite in calc-silicate rocks. Newberry and others (1986) classified the Pilgrim prospect as a copper(-zinc-silver) skarn, and Newberry and others (1997) classified it as a calcic copper skarn.
Geologic map unit (-149.020260488673, 67.7540054432642)
Mineral deposit model Cu skarn deposit (Cox and Singer, 1986; model 18b).
Mineral deposit model number 18b
Age of mineralization Devonian(?) based on Early Devonian Pb/Pb zircon ages from the nearby Baby Creek batholith and Horace Mountain plutons (Dillon and others, 1996).
Alteration of deposit Local development of masses of skarn in calcareous rocks.

Production and reserves

Workings or exploration The Pilgrim prospect was staked by Placid Oil Company in 1972 and explored by them until 1977 (Kurtak and others, 2002). It was also one of the prospects listed in a report by Ventures Resources Corp. (1999) about their exploration of the Chandalar Copper Belt.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

This prospect is on Doyon Ltd. selected lands; for more information, contact Doyon Ltd., Fairbanks, Alaska.
MAS No. 0020310143

References

References

Dillon, J.T., Reifenstuhl, R.R., and, Harris, G.W., 1996, Geologic map of the Chandalar C-5 quadrangle, southeastern Brooks Range, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 104, 2 sheets, scale 1:63,360.
Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska, 2 vols.: Bureau of Land Management, Alaska Technical Report 50, 845 p.
Newberry, R.J., Allegro, G.L., Cutler, S.E., Hagen-Levelle, D.D., Adams, D.D., Nicholson, L.C., Weglarz, T.B., Bakke, A.A., Clautice, K.H., Coulter, G.A., Ford, M.J., Myers, G.L., and Szumigala, D.J., 1997, Skarn deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 355-395.
Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752.
Nicholson, L.M., 1990, Porphyry copper, copper skarn, and volcanogenic massive sulfide occurrences in the Chandalar copper district, Alaska: Fairbanks, University of Alaska, M.Sc. thesis, 164 p.
Ventures Resource Corp., 1999, 1999 Annual Report: Ventures Resource Corporation, 36 p.
WGM Inc., 1980, 1979 annual profess report, Block 5-Wiseman Chandalar Cop[er Belt: Unpublished report 80-06 for Doyon Ltd., 28 p. (on file at Doyon Ltd., Fairbanks, Alaska).
Reporters J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey)
Last report date 4/18/2010