Hurricane-Diane

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au
Ore minerals chalcopyrite; magnetite; pyrite; pyrrhotite
Gangue minerals actinolite; epidote; garnet

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale C-5
Latitude 67.7223
Longitude -149.1827
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Hurricane-Diane prospect is on the ridge east of the head of Sheep Creek, about 0.3 mile north-northwest of peak 4452. It is about 0.5 mile south-southwest of the center of section 32, 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 Hurricane-Diane prospect was discovered by Bear Creek Mining Company in 1967 in what would would become known as the Chandalar Copper Belt. Bear Creek explored the property until 1970 and WGM Inc. continued the exploration to the 1980s in conjunction with their other work along the Copper Belt. The exploration at the Hurricane-Diane prospect included geologic mapping, geophysical and geochemical surveys, and sampling. (Kurtak and others, 2002).
The Hurricane-Diane prospect consists of a northeast-trending line of resistant knobs of garnet-epidote skarn, about 40 feet wide and 1.5 miles long (Kurtak and others, 2002). Most of the prospect is tundra covered but the rocks in the vicinity are Ordovician phyllite, marble, and calcareous schist (Dillon and others, 1996). A geochemical survey suggests that the skarn and the mineralization is probably continuous below the tundra (WGM, Inc. 1979). Several samples of epidote-calc-silicate skarn with pyrite, pyrrhotite, and chalcopyrite collected by Nicol (1983) contained up to 930 parts per billion gold (ppb), 8.3 parts per million (ppm) silver, 3.76 percent copper, and 200 ppm arsenic. Six skarn samples with pyrite, chalcopyrite, pyrrhotite, and magnetite collected by Kurtak and others (2002) averaged 2.54 percent copper and 20.15 ppm silver; two chip samples averaged 1,286 ppb gold.
The Hurricane-Diane prospect is one of a number of skarn deposits in the Chandalar area which have been described by Newberry and others (1986). These skarns are northwest of a belt of Devonian(?) granitic rocks informally named the Horace Mountain plutons that are probably genetically related to the skarns. Many of the skarns exhibit both prograde and retrograde mineral assemblages. Newberry and others (1986) stated that their mineralogy, mineralization, and alteration indicate that most of these skarn deposits are continental-margin, porphyry-related copper skarns. However, the association of epidote, garnet, and actinolite in the Hurricane-Diane skarn is a retrograde assemblage and the deposit is probably distal mineralization in the Chandalar Copper Belt. An analysis of a sample they collected contained 1.5 percent copper, 105 ppm silver, 0.2 percent zinc, and 0.07 lead. Because the zinc and lead values are low, they classified it as a calcic copper skarn.
Geologic map unit (-149.185461361223, 67.7219019628604)
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 Masses of skarn developed in limestone and calcareous rocks.

Production and reserves

Workings or exploration The Hurricane-Diane prospect was discovered by Bear Creek Mining Company in 1967 in what would would become known as the Chandalar Copper Belt. Bear Creek explored the property until 1970 and WGM Inc. continued the exploration to the 1980s in conjunction with their other work along the Copper Belt. The exploration at the Hurricane-Diane prospect included geologic mapping, geophysical and geochemical surveys, and sampling (Kurtak and others, 2002).
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. 0020310058

References

MRDS Number A012142

References

Dashevsky, S.S., 1986, Mines, prospects, and geochemical anomalies on Doyon Ltd. regional overselection lands, Alaska Blocks 1 - 8, v; I of II: Unpublished report 86-01A for Doyon Ltd., 42 p. (on file at Doyon Ltd., Fairbanks, Alaska).
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.
Nicol, D.L., 1983, Evaluation of the mineral potential of Doyon Ltd.'s Block 5 and 22 (unpublished report 83-04 for Doyon Ltd., (on file at Doyon Ltd., Fairbanks, Alaska).
WGM Inc., 1978, 1977 Annual progress report, Doyon Ltd. project, v. II, Luna area: Unpublished report 78-04 for Doyon Ltd., 15 p. (on file at Doyon Ltd., Fairbanks, Alaska).
WGM Inc., 1979, 1978 Doyon Ltd. annual progress report, Block 5 Luna volcanogenic massive sulfide and associated base-metal deposits and anomalies of the Chandalar Copper Belt: Unpublished report 79-21 for Doyon Ltd., 35 p. (on file at Doyon Ltd., Fairbanks, Alaska).
WGM Inc., 1980, 1979 annual progress report, Block 5-Wiseman Chandalar Copper 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