Boer Creek

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale NM
Quadrangle map, 1:63,360-scale D-1
Latitude 64.8644
Longitude -165.2988
Nearby scientific data Find additional scientific data near this location
Location and accuracy Boer Creek is a south tributary of the Hudson River, a headwater tributary of Nome River. The mine is about 1.25 miles west-southwest of where Dickens Creek crosses the Nome-Taylor road. The mine is in Boer Creek at an approximate elevation of 850 feet. The location is accurate within about 1,000 feet. Boer Creek is locality 81 of Cobb (1972 [MF 468], 1978 [OFR 78-93]).

Geologic setting

Geologic description

Placer gold mining took place on Boer Creek in 1901-02 when about 135 ounces of gold were produced (Collier and others, 1908). The recovered gold was of two types: one valued at about 16 dollars per ounce and one valued at 18 dollars per ounce (gold at 20.67 dollars per ounce). The pay streak was narrow and nearly confined to the creek bed; gravel in the creek was from 18 inches to 8 feet thick. The upper part of the creek contained a iron-cemented ferricrete gravel which also contained placer gold. When the placer was visited by Moffit in 1905-06, it was producing gold from a small hydraulic plant operated on a residual placer on weathered graphitic schist, which Moffit believed furnished all or most of the placer gold (Moffit, 1913, p. 76, 100).
Boer Creek is underlain by the graphitic, calcareous schist unit of Hummel (1962 [MF 248]) that consists predominantly of slightly graphitic, calcareous quartz schist. Regional mapping suggests that these schists have been upgraded to lower amphibolite facies and are biotite-bearing (Sainsbury, Hummel, and Hudson, 1972; Bundzten and others, 1994). According to Collier and others (1908, p. 182), the bedrock at the mine was a chloritic schist cut by numerous glassy quartz veins. The bedrock could be part of the Nome Group derived from Precambrian to early Paleozoic protoliths (Till and Dumoulin, 1994). The Nome Group underwent regional blueschist facies metamorphism in the Late Jurassic or Early Cretaceous (Sainsbury, Coleman, and Kachadoorian, 1970; Forbes and others, 1984; Thurston, 1985; Armstrong and others, 1986; Hannula and McWilliams, 1995). The blueschist facies rocks were recrystallized to greenschist facies or higher metamorphic grades in conjunction with regional extension, crustal melting, and magmatism in the mid-Cretaceous (Hudson and Arth, 1983; Miller and Hudson, 1991; Miller and others, 1992; Dumitru and others, 1995; Hannula and others, 1995; Hudson, 1994; Amato and others, 1994; Amato and Wright, 1997, 1998). Lode gold mineralization on Seward Peninsula is mostly related to the higher temperature metamorphism in the mid-Cretaceous (Apodoca, 1994; Ford, 1993 [thesis]; Ford and Snee, 1996; Goldfarb and others, 1997).
Geologic map unit (-165.301426378361, 64.8636420586136)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration The deposit was mined on a small scale in 1901 and 1902 when it produced about 135 ounces of gold of 770 and 870 fineness. It was shut down in 1903 pending the completion of the Campion Ditch, but it was again operated as a small hydraulic mine in 1906. It has been inactive for many years.
Indication of production Yes; small
Production notes About 135 ounces of gold of 770 and 870 fineness were produced in 1901-02 (Collier and others, 1908).

References

MRDS Number A012879

References

Apodoca, L.E., 1994, Genesis of lode gold deposits of the Rock Creek area, Nome mining district, Seward Peninsula, Alaska: Boulder, Colorado, University of Colorado, Ph.D. dissertation, 208 p.
Armstrong, R.L., Harakal, J.E., Forbes, R.B., Evans, B.W., and Thurston, S.P., 1986, Rb-Sr and K-Ar study of metamorphic rocks of the Seward Peninsula and southern Brooks Range, Alaska, in Evans, B.W., and Brown, E.H., eds., Blueschists and eclogites: Geological Society of America Memoir 164, p. 184-203.
Ford, R.C., 1993, Geology, geochemistry, and age of gold lodes at Bluff and Mt. Distin, Seward Peninsula, Alaska: Golden, Colorado School of Mines, Ph.D. dissertation, 302 p.
Ford, R.C., and Snee, L.W., 1996, 40Ar/39Ar thermochronology of white mica from the Nome district, Alaska--The first ages of lode sources to placer gold deposits in the Seward Peninsula: Economic Geology, v. 91, p. 213-220.
Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 151-190.
Hannula, K.A., and McWilliams, M.O., 1995, Reconsideration of the age of blueschist facies metamorphism on the Seward Peninusla, Alaska, based on phengite 40Ar/39Ar results: Journal of Metamorphic Geology, v. 13, p. 125-139.
Hannula, K.A., Miller, E.L., Dumitru, T.A., Lee, Jeffrey, and Rubin, C.M., 1995, Structural and metamorphic relations in the southwest Seward Peninsula, Alaska; Crustal extension and the unroofing of blueschists: Geological Society of America Bulletin, v. 107, p. 536-553.
Hudson, T.L., 1994, Crustal melting events in Alaska, in Plafker, G., and Berg, H. C., eds., The Geology of Alaska: Geological Society of America, DNAG, The Geology of North America, Vol. G-1, p. 657-670.
Hudson, T.L., and Arth, J. G., 1983, Tin granites of Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 94, p. 768-790.
Miller, E.L., Calvert, A.T., and Little, T.A., 1992, Strain-collapsed metamorphic isograds in a sillimanite gneiss dome, Seward Peninsula, Alaska: Geology, v. 20, p. 487-490.
Thurston, S.P., 1985, Structure, petrology, and metamorphic history of the Nome Group blueschist terrane, Salmon Lake area, Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 96, p. 600-617.
Till, A.B., and Dumoulin, J.A, 1994, Geology of Seward Peninsula and St. Lawrence Island, in Plafker, G., and Berg, H.C., eds., The Geology of Alaska: Geological Society of America, DNAG, The Geology of North America, v. G-1, p. 141-152.
Reporters C.C. Hawley and Travis L. Hudson
Last report date 10/22/1999