Big Creek

Mine, Probably inactive

Commodities and mineralogy

Main commodities Au
Other commodities Sn
Ore minerals cassiterite; gold

Geographic location

Quadrangle map, 1:250,000-scale RB
Quadrangle map, 1:63,360-scale C-5
Latitude 64.66257
Longitude -155.46221
Nearby scientific data Find additional scientific data near this location
Location and accuracy Big Creek is a curved stream with west-flowing headwaters that turn northward toward the Yukon River and curve southeast toward the flats of the Nowitna River before curling to flow northwest into the Yukon River. The Big Creek placer area, location 4 of Cobb (1972 [MF405]), stretches almost a mile on the headwaters of the creek, two miles northwest of Boston Dome and 5 air-miles south of the Yukon River. The coordinates above mark the center of the mined area, in section 33, T. 9 S., R. 17 E. of the Kateel River meridian. The location is accurate within 1/4 mile. Big Creek is located within Doyon, Ltd.'s Ruby Village Block.

Geologic setting

Geologic description

The bedrock underlying Big Creek consists of slate and granite, both cut by veins of quartz and tourmaline (Eberlein and others, 1977). Big Creek was prospected in 1910; miners sank 15 holes 15 to 60 feet down until they hit slaty bedrock (Maddren, 1910). A 1 to 7-foot-thick gravel layer on the bedrock was found to be auriferous (Maddren, 1910). Pyrite occurs in gravel and attached to large fragments of bedrock. Cassiterite is also abundant in the placer gravels. The pay streak is about 30 feet wide and 1 to 15 feet thick and may extend as much as 5,000 feet downstream from the mouth of Cox Pup (Chapman and others, 1963). In the upper valley, about 0.04 pound cassiterite and 0.0052 ounce of gold per cubic foot can be panned from dumps of prospect holes (Chapman and others, 1963). Sporadic mining took place along the creek between 1907 and the 1940s. Big Creek was also prospected during more recent years by several larger companies (Pete Haggland, oral communication, 2000).
Geologic map unit (-155.464663337352, 64.6619677171011)
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 Around 1910, miners sank 15 holes 15 to 60 feet down to slaty bedrock (Maddren, 1910). Most of the ground is not frozen and is difficult to work by drift mining. Sporadic mining took place along the creek between 1907 and the 1940s (Chapman and others, 1963). Big Creek was also prospected during more recent years by several larger companies (Pete Haggland, oral communication, 2000).
Indication of production Yes; small

Additional comments

See also Cox Pup (RB011).

References

MRDS Number A015526

References

Reporters C.E. Cameron (Alaska Division of Geological and Geophysical Surveys)
Last report date 3/22/2000