Deposit ID | 10097536 |
---|---|
MRDS ID | A013354 |
Record type | Site |
Current site name | Spruce Creek Placer |
Related records | 10185869 |
Geographic coordinates: | -133.33387, 57.59531 (WGS84) |
---|---|
Elevation | 30 |
Relative position | 750 FT. E OF HEAD OF WINDHAM BAY |
(click for info) |
Country | State |
---|---|
United States | Alaska |
Commodity | Importance |
---|---|
Gold | Primary |
Result | PANNED CONCENTRATE SAMPLES ASSAYED UP TO 0.017 OZ/CY AU, SAMPLE 4K143, USGS B 1525, P. 154-56. |
---|
Host or associated | Host | ||
---|---|---|---|
Rock type | Unconsolidated Deposit > Clay, Mud | ||
|
Host or associated | Host |
---|---|
Rock type | Unconsolidated Deposit > Silt |
Host or associated | Host |
---|---|
Rock type | Unconsolidated Deposit > Gravel |
(1) | -133.33387, 57.59531 |
---|
Thickness | 30.48M |
---|---|
Length | 3701.39M |
Development status | Past Producer |
---|---|
Commodity type | Metallic |
Deposit size | Small |
Significant | No |
Discovery year | 1869 |
Year of first production | 1869 |
Year of last production | 1911 |
District name | Petersburg |
---|
Ownership category | National Forest |
---|
Agency | Database name | Acronym | Record ID | Notes |
---|---|---|---|---|
USGS | Mineral Resources Data System | MRDS | A013354 |
USGS B 1525, P. 153-156, 192, FIG. 52, PLATES 1, 3 (1984)
USBM OFR 91-86, P. 4, 8, 9, 36 (1986)
BAG-B-1525-FIG-52
Subject category | Comment text |
---|---|
Deposit | PLACER DEPOSIT CONSISTS OF TWO BASINS. FIRST BASIN HAS GREENSTONE BARRIER AT LOWER END, ABOUT 750 FT. UPSTREAM FROM TIDEWATER. BASIN IS GLACIAL IN ORIGIN. CREEK NOW FLOWS THROUGH BEDROCK TUNNEL SEVERAL HUNDRED FT. LONG THROUGH BARRIER. BASIN FLOOR NEAR TUNNEL ENTRANCE IS AT LEAST 80 FT. BELOW ORIGINAL BEDROCK STREAM CHANNEL OVER BARRIER. BENCH GRAVELS ARE 15 FT. ABOVE BARRIER LEVEL. DEPOSITS CONSIST OF ABOUT 8 FT. OF FLAT-LYING BENCH GRAVEL, UNDERLAIN BY 70 FT. OF VERY COARSE GRAVEL AND BOULDERS AT 15 DEGREES DIP DOWNSTREAM, UNDERLAIN BY 20 FT. OF BLUE CLAY AND SILT WITH MARINE, FOSSILS, ALSO DIPPING DOWNSTREAM, WITH GRAVEL AND BOULDERS OF PRESENT STREAM BED EXPOSED BELOW. GOLD READILY PANNED FROM FLAT-LYING BENCH GRAVEL LAYER; A FEW COLORS COULD BE PANNED FROM JUST ABOVE BLUE CLAY LAYERS; LITTLE COULD BE PANNED FROM SLOPING GRAVEL LAYERS OR STREAM BOULDERS AND BARS. SECOND BASIN IS 1 MI. UPSTREAM FROM FIRST, AT 750 FT. ELEVATION. UPPER PART OF CREEK FROM 1,600-2,500 FT. |
Deposit | ELEVATION CONSISTS OF SHALLOW GRAVEL BEDS AND POT HOLES IN OR CLOSE TO BEDROCK, WELL SUITED FOR SMALL-SCALE HAND MINING METHODS. |
Deposit | SAMPLE RESULTS INDICATE THIS IS NOT AN ECONOMICALLY MINEABLE DEPOSIT. IT IS DOUBTFUL THAT CREEK CONTAINS UNDISCOVERED PLACERS OF ANY IMPORTANCE. STREAM GRADIENT IS OVER 1,000 FT./MI. ; INFO.SRC : 1 PUB LIT |
Deposit | THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE. |
Type | Date | Name | Affiliation | Comment |
---|---|---|---|---|
Reporter | 01-JUN-1987 | Niles, L.P. (Huber, D.F.) | U.S. Geological Survey |