|Quadrangle map, 1:250,000-scale||SO|
|Quadrangle map, 1:63,360-scale||D-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Sweetcake Creek is a north tributary to Ophir Creek (SO053). The mouth of Sweetcake Creek (not named on current USGS topographic maps) is about 0.8 miles upstream of the confluence of Ophir Creek and the Niukluk River. Placer mining took place in the lower mile of Sweetcake Creek at elevations of about 150 feet. This is locality 119 of Cobb (1972, MF 445; 1978, OF 78-181).|
Geologic descriptionThe first placer mining in the Ophir Creek area occurred on Sweetcake Creek soon after gold was discovered here in 1898 (Collier and others, 1908). A stratigraphic section near the mouth of Sweetcake Creek included, from top to bottom: 5 feet of fine micaceous sand, 2 feet of gravel and sand, and 1 foot of angular schist, pay gravel on bedrock (Collier and others, 1908). The gravels of Sweetcake Creek contained abundant mineralized quartz and calcite fragments. It is reported that gold worth $36,000 (about 1,800 ounces) was recovered in 1898 from one claim (Collier and others, 1908) and total production from the creek is probably a few thousand ounces (Cobb, 1978, OF 78-181). The lower part of Sweetcake Creek crosses a low bench as it nears Ophir Creek but early mining was on a narrow pay streak along the active drainage. Bedrock in the area is part of a lower Paleozoic metasedimentary assemblage (Till and others, 1986).
|Geologic map unit||(-163.743617403295, 64.9312717868886)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Small-scale surface mining took place before WW I over the lower mile of the creek.|
|Indication of production||Yes; small|
|Production notes||It is reported that gold worth $36,000 (about 1,800 ounces) was recovered in 1898 from one claim (Collier and others, 1908) and total production from the creek is probably a few thousand ounces (Cobb, 1978, OF 78-181).|
Cobb, E.H., 1972, Metallic mineral resources map of the Solomon quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-445, 1 sheet, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Solomon quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-181, 185 p.
Collier, A.J., Hess, F.L., Smith, P.S., and Brooks, A.H., 1908, The gold placers of parts of Seward Peninsula, Alaska, including the Nome, Council, Kougarok, Port Clarence, and Goodhope precincts: U.S. Geological Survey Bulletin 328, 343 p.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||8/19/1999|