Seattle Creek

Mine, Undetermined

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-6
Latitude 60.8659
Longitude -149.162
Nearby scientific data Find additional scientific data near this location
Location and accuracy Seattle Creek is located in T. 9 N., R. 1 and 2 E., of the Seward Meridian. The map site is in the S1/2 section 18, T. 9 N., R. 2 E. The location is accurate to 300 feet. The placer workings are about one mile upstream from the mouth the creek. This is location 8 of MacKevett and Holloway (1977), location 8 of Cobb and Tysdal (1980), and location P-70 of Jansons and others (1984).

Geologic setting

Geologic description

The bedrock in this area has been mapped as sedimentary rock of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). Seattle Creek occupies a long, fairly narrow U-shaped valley and has a narrow bedrock canyon.
Gold occurs throughout the channel gravels, but it is mostly concentrated on bedrock. Some small areas of bench gravels exist in the lower part of the creek; these contain disseminated gold that occurs in sandy, boulder-rich gravel resting on a 6- to 12-inch-thick clay layer (Jansons and others, 1984). The gold in both the bench and channel deposits is fairly fine, although particles as long as three-sixteenths of an inch have been recovered.
The U.S. Bureau of Mines collected six suction-dredge samples of bench and channel gravels in 1979. These samples contained 0.0136 to 0.0316 ounce of gold per yard (Jansons and others, 1984).
Geologic map unit (-149.16416401267, 60.8653302305228)
Mineral deposit model Placer Au (alluvial) (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration A hydraulic pit is on the west side of the Seattle Creek about one mile south of Turnagain Arm along with a few hand workings and suction dredge pits scattered along the creek. The U.S. Bureau of Mines collected six suction dredge samples of bench and channel gravels in 1979. These samples contained 0.0136 to 0.0316 ounce of gold per yard (Jansons and others, 1984).
Indication of production Yes; small
Reserve estimates There are more than 250,000 cubic yards of gravel in the lower part of Seattle Creek that have moderate mineral potential (Jansons and others, 1984).

References

MRDS Number A010609

References

Reporters Jeff A. Huber (Anchorage)
Last report date 3/7/2000