Bureau of Mines / Minerals yearbook: Area reports: domestic 1978-79
Year 1978-79, Volume 2 (1978-1979)
Pittman, Tom L.
Alaska, pp. 43-51 ff. PDF (952.3 KB)
Table 4.—Alaska: Placer production of gold Year ~ Mines producing ~ Material1 treated (thousand cubic yards) Gold recovered Troy ounces Value (thousands) A va~~ cubic yard 1975 23 1,751 14,980 $2,419 $1382 1976 1977 1978 1979 26 22 21 14 1,699 1,800 1,455 778 22,605 18,924 18,599 6,675 2,833 2,807 3,600 2,053 1.667 1.559 2.474 2.639 ' Excludes material treated primarily for the recoveryof platinum. THE MINERAL INDUSTRY OF ALASKA 47 often referred to as the Delta mineral belt. Major values are in zinc and lead, with minor amounts of copper and silver. Thirtyseven deposits have been reported in the district through 1979. They are described as stratiform sulfide deposits. There were extensive exploration and drilling programs in the Delong Mountains, a western part of the Brooks Range about 80 miles northwest of Kotzebue. A group composed of General Crude, Houston Oil and Minerals, and WGM Inc., operated two exploration camps on their properties in 1979. After the 1978 season, they announced having 19 million tons of evaluated reserves averaging 3.35% lead, 9.3% zinc, and 1.4 troy ounces of silver per ton in the Wulik River area. Cominco American, Inc., continued drillingits Lik and Su properties. Geologists of the Bureau of Mines discovered several mineral occurrences along the southern part of the National Petroleum Reserve of Alaska. They were engaged in mineral resource work on Reserve lands that are withdrawn from mineral entry. These occurrences are similar in mineralogy and character to the Red Dog - Wulik River deposits. Work by the Geological Survey suggests similarities in the respective host rocks. These discoveries may indicate a possible major mineral belt extending at least 120 miles easterly along the north side of the Brooks Range. This area is in the Misheguk Mountain and the Howard Pass Quadrangles, about 200 miles northeast of Kotzebue. Anaconda has located prospects near Mount Schwatka, northeast of Fairbanks. The deposit area was subsequently included in the Yukon Flats National Monument. Geologic trends favorable for zinc-leadcopper-silver deposits have been identified in southeast Alaska. One such trend on Admiralty Island, extends from north of Greens Creek southerly past Gambier and Pybus Bays. Pan Sound Joint Venture (Noranda) has identified several prospects north of Greens Creek, and the "Greens Creek" prospect just south of it. The Anaconda Co. has the Pyrola Group about 6 miles south of the Greens Creek deposit, and WGM Inc., and some associates have several prospects west of Gambier and Pybus Bays. Almost 1,000 claims have been located along a similar trend on Kupreanof Island to the south of Admiralty Island and west of Petersburg. Locators included Amoco Minerals Co., Mapco,and Resource Associates of Alaska. Geologic work and some drilling was done during 1978 and 1979. BP Alaska Exploration, Inc., explored a group of claims on Zarembo, the next island south of Kupreanof. The Riverside mine, north of Hyder, was examined and sampled by Nor-Quest Resources.Workings below the mill adit level were pumped out for the first time since 1927. The mine has produced lead, zinc, silver, gold, and tungsten. Molybdenum.—U.S. Borax & Chemical Corp. has been developing a world-class molybdenite deposit at Quartz Hill, about 45 miles east of Ketchikan. After the end of the 1979 field season, U.S. Borax reported that since discovery in 1974, it has drilled 100,000 feet of core hole which indicated inplace reserves of 1.3 billion tons grading 0.13% molybdenite at 0.05% cutoff. This is equivalent to 2 billion pounds of contained molybdenum and is a 20% increase in the estimated in-place reserves over that reported at the end of 1978. U.S. Borax has invested $14.5 million in its Quartz Hill project to date. The proposed budget for 1980 is over $5 million. A major portion of the budget will be for continuation of the
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