|Quadrangle map, 1:250,000-scale||RB|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Willow Creek is a southwest-flowing headwater tributary of Basin Creek. A misprint on the USGS Ruby Quadrangle map (1952, limited revisions in 1984) renames Willow Creek as Swift Creek. Coordinates given correspond to the Willow Creek location 11 of Cobb (1972 [MF405]), and mark the center of tailings shown on the USGS Ruby (B-6) Quadrangle map (1952, minor revisions in 1973). The tailings are in the headwater section of the creek, in section 36, T. 12 S., R. 16 E. of the Kateel River meridian The location is accurate.|
The bedrock under the mined areas of Willow Creek is greenstone and argillite, although the creek apparently drains a contact zone between schist and greenstone (Mertie, 1936; Eberlein and others, 1977). The gravels in the creek contain a carbonaceous layer, sheared chert, greenstone, sandy phyllite and schist, and some vein quartz (Mertie and Harrington, 1916; Mertie, 1936).
The pay streak was in the present day creek bottom and is about 10 feet wide and ran 25 to 30 cents per square foot of bedrock (gold at $20.67 per ounce) (Mertie, 1936). The gold is present in the lower one foot of gravel before bedrock and within the top foot of bedrock. The gold is both fine and coarse; at least one nugget weighed about 2.4 ounces (Mertie and Harrington, 1916).In 1915, the upper part of the creek, where the ground was 5 to 6 feet deep, was worked using open-cut methods (Mertie and Harrington, 1916). Farther downstream in 1915, miners sluiced off 10 to 12 feet of muck and then mined 6 to 8 feet of gravel. Mining by these methods was nearly continuous until 1933 (Mertie, 1936).
|Geologic map unit||(-155.583862603569, 64.4095333736329)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||A few exploration holes were sunk about 1 mile from the mouth of Willow Creek, and gold was reported (Mertie and Harrington, 1916). In 1915, the upper part of the creek, where the ground was 5 to 6 feet deep, was worked using open-cut methods (Mertie and Harrington, 1916). Farther downstream in 1915, miners sluiced off 10 to 12 feet of muck and then mined 6 to 8 feet of gravel. Mining by these methods was nearly continuous until 1933 (Mertie, 1936).|
|Indication of production||Yes; small|
Additional commentsThe USGS Ruby quadrangle map (1952, with limited revisions in 1984) misnames Willow Creek as the neighboring Swift Creek.
Cobb, E.H., 1972, Metallic mineral resources map of the Ruby quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-405, 1 sheet, scale 1:250,000.
Cobb, E.H., and Chapman, R.M., 1981, Mineral occurrences (other than mineral fuels and construction materials) in the Kantishna River and Ruby quadrangles, Alaska: U.S. Geological Survey Open-File Report 81-170, 94 p.
Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000.
Mertie, J.B., Jr., 1936, Mineral deposits of the Ruby-Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 864-C, p. 115-245.
|Reporters||C.E. Cameron (Alaska Division of Geological and Geophysical Surveys)|
|Last report date||3/22/2000|