Yacko Creek

Mine, Inactive

Commodities and mineralogy

Main commodities Au; Pt
Other commodities Pd
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale B-1
Latitude 62.2635
Longitude -147.3616
Nearby scientific data Find additional scientific data near this location
Location and accuracy Placer claims extend for the length of Yacko Creek, about 6 miles. The center of these claims is near the center of sec. 11, T. 25 N., R. 11 E., Seward Meridian. The location is accurate.

Geologic setting

Geologic description

Yacko Creek drains an area of Jurassic sedimentary and volcanic rocks, and Tertiary fluviatile conglomerate, siltstone, shale, and cobble and boulder conglomerate (Csejtey and others, 1978). The creek valley is 100 to 600 feet wide and the alluvial gravel is 6 to 50 feet thick (Kurtak and others, 1992). Placer samples collected by the U.S. Bureau of Mines contain up to 0.0032 ounce of gold per cubic yard, 56 parts per billion palladium, and 9600 parts per billion platinum (Kurtak and others, 1992). Samples of glacial gravel on the ridge between Yacko and Walker Creeks have up to 0.001 ounce of gold per cubic yard.
There are several placer camps and numerous claim blocks along Yacko Creek. Chapin (1918) reported coarse gold in that was sufficient '...to encourage further work...' (Chapin, 1918). Churn drilling started in 1954 and suction dredging in 1976. Nelchina Mines operated in 1984. The total production is about 1000 ounces, with 3 ounces of platinum recovered for every 97 ounces of gold (Kurtak and others, 1992). As of January 1, 2000, a block of approximately 45 state claims covered this mine (Northern Associates Inc., written communication, 2001). An estimated 1,000 ounces of gold was produced during 1984 from material that contained about 0.003 ounce of gold per cubic yard (Kurtak and others, 1992).
Geologic map unit (-147.363814399752, 62.2630051878715)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Quaternary placer.

Production and reserves

Workings or exploration There are several placer camps and numerous claim blocks along Yacko Creek. Chapin (1918) reported coarse gold in that was sufficient '...to encourage further work...' (Chapin, 1918). Churn drilling started in 1954 and suction dredging in 1976. Nelchina Mines operated in 1984. The total production is about 1000 ounces, with 3 ounces of platinum recovered for every 97 ounces of gold (Kurtak and others, 1992). Placer samples were collected by the U.S. Bureau of Mines (Kurtak and others, 1992). As of January 1, 2000, a block of approximately 45 state claims covered this mine (Northern Associates Inc., written communication, 2001).
Indication of production Yes; small
Reserve estimates There are an estimated 12 million cubic yards of potentially auriferous, alluvial gravel in the creek.
Production notes An estimated 1,000 ounces of gold was produced during 1984 from material that contained about 0.003 ounce of gold per cubic yard (Kurtak and others, 1992).

Additional comments

MAS/MILS number 20760022.

References

MRDS Number A012187

References

Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 10/2/2002