Linda Creek

Mine, Active

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale C-6
Latitude 67.5177
Longitude -149.8187
Nearby scientific data Find additional scientific data near this location
Location and accuracy Linda Creek is a west-flowing tributary to the Middle Fork Koyukuk River. The mine is approximately 6 1/4 miles south-southwest of Sukakpak Mountain and 1/2 mile east of the Trans-Alaska Pipeline. The center of the mine is about 0.5 mile north-northeast of the center of section 17, T. 31 N., R. 10 W.

Geologic setting

Geologic description

Linda Creek was a consistent gold producer from 1901 to at least 2002 (Kurtak and others, 2002). Gold was discovered in 1901 and by 1903, 871 ounces of gold had been produced, mainly from the discovery claim near the sharp bend in the creek about 0.8 mile upstream from its mouth. Placer mining continued intermittently by simple hydraulic and hand methods until 1938. Mining took place in 1962 and 1975 using heavy equipment. Drift mining by drilling and blasting and diesel haulage began in 1978 and continued until at least 2002. The total production from 1902 to 1999 was 2,069 ounces of gold.
The early placer mining was along the modern stream channel for about 0.25 mile downstream from the sharp bend in Linda Creek at the airfield. There is little information about the early mining except that nearly all the gold was mined from the Discovery claim about 1/2 mile above the mouth. But only the upper half of this claim was productive. Reed (1938) described a 'shoveling in' surface-mining operation. Eight feet of gravel overlay bedrock; the gold was in the lower 3 feet of gravel and the upper two feet of bedrock. About a quarter of a mile downstream from the bend, the bedrock changes to phyllite and slopes down steeply to the west; no gold has been found downstream. Maddren (1913) and most miners since have thought that the source of the gold at the bend was not in the upper portion of Linda Creek but that the gold came from an ancestral channel of Gold Creek (CH080) that drained toward the mouth of modern Linda Creek.
East of the bend, early drift mining located a high channel that was probably the ancestral course of Gold Creek (Kurtak and others, 2002). From 1982 to at least 2002, the deep gravel east of the bend in Linda Creek was mined with drills and explosives to free the frozen gravel and diesel haulage to bring the gravel to the surface. The auriferous gravel is about 100 feet wide; the gold is in the lower 2.5 to 3.0 feet of the gravel and the upper 1.5 feet of the phyllite bedrock. The gold apparently is not confined to a single channel but is distributed across a series of braided channels. Most of the gold occurs as flattened to rounded nuggets. The largest nugget was 0.99 ounce and the pay zones have as much as 1.0 ounce of gold per cubic yard. Figure C-7 of Kurtak and others (2002) is a map of the drift mine.
Kurtak and others (2002) suggested the possibility of a large gold resource in the deep buried channel of Linda Creek, east of the bend. They estimated an 'inferred resource' of 2.4 million cubic yards of gravel of uncertain grade.
Geologic map unit (-149.821450332672, 67.517283650861)
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 Linda Creek was a consistent gold producer from 1901 to at least 2002 (Kurtak and others, 2002). Gold was discovered in 1901 and by 1903, 871 ounces of gold had been produced, mainly from the discovery claim near the sharp bend in the creek about 0.8 mile upstream from its mouth. Placer mining continued intermittently by simple hydraulic and hand methods until 1938. Mining took place in 1962 and 1975 using heavy equipment. Drift mining by drilling and blasting and diesel haulage began in 1978 and continued until at least 2000.
Indication of production Yes; small
Reserve estimates Kurtak and others (2002) suggested the possibility of a large gold resource in the deep buried channel of Linda Creek, east of the bend. They estimated an 'inferred resource' of 2.4 million cubic yards of gravel of uncertain grade.
Production notes The total production from 1902 to 1999 was 2,069 ounces of gold.

Additional comments

MAS No. 0020310003

References

MRDS Number A011035

References

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.
Reporters J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey)
Last report date 4/18/2010