The Unnamed (near headwaters of Midnight Creek) is a silver, gold, and lead mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
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Unnamed (near headwaters of Midnight Creek) MRDS details
Site Name
Primary: Unnamed (near headwaters of Midnight Creek)
Commodity
Primary: Silver
Primary: Gold
Primary: Lead
Secondary: Copper
Secondary: Zinc
Location
State: Alaska
District: Kougarok
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Quartz veining and iron-oxide fracture fillings and staining are common. There may have been some clay development. Unoxidized mineralization probably contains pyrite and base metal sulfides.
Rocks
Not available
Analytical Data
Not available
Materials
Gangue: Quartz
Comments
Comment (Exploration): Status = Inactive
Comment (Commodity): Gangue = Iron-oxides
Comment (Geology): Age = Probably Late Cretaceous; this occurrence may be associated with emplacement and crystallization of the Oonatut Granite Complex. K/Ar ages for the Oonatut Granite Complex are about 70 my (Hudson, 1979).
Comment (Reference): Primary Reference = Sainsbury and others, 1970
Comment (Workings): Workings / Exploration = Shallow hand-dug prospect pits may be present.
Comment (Geology): Geologic Description = A linear altered zone in polydeformed metapelitic schist of possible Precambrian age (Till and others, 1986) trends about N 55 W across this spur. Sainsbury and others (1970) indicate that rusty graphitic schist and quartz vein fragments are present over a length of 2,000 feet. A sample of iron-stained fracture fillings contained 0.8 ppm Au, 700 ppm Ag, 10,000 ppm As, 1,500 ppm Cu, greater than 10,000 ppm Pb, 150 ppm Sb, and 5,000 ppm Zn. A composite grab sample of surface float collected along 300 feet of the altered zone contained 0.02 ppm gold, 3 ppm Ag, 300 ppm As, 150 ppm Cu, 1,500 ppm Pb, and 500 ppm Zn (Sainsbury and others, 1970, Table 2). The altered zone is probably developed along a high-angle fault. This occurrence, and other nearby occurrences in the headwaters of Humbolt and Ferndale Creeks to the north (BN049-BN052), are interpreted to be structurally above subsurface extensions of the Oonatut Granite Complex (Hudson, 1979). The Oonatut Granite outcrops 2.5 miles to the northwest of this occurrence. This large exposed granite complex is part of the western Seward Peninsula tin-granite suite (Hudson and Arth, 1983). Sainsbury and others (1970, p. H8) suggest that the polymetallic character of the mineralization in this altered zone is similar to what is found in the peripheral silver zone of tin deposit systems. However, only pan concentrate samples from this occurrence had anomalous tin values (to 200 ppm, Sainsbury and others, 1970, Table 2).
Comment (Deposit): Model Name = Polymetallic veins developed peripheral to tin deposits
References
Reference (Deposit): Hudson, T.L., 1979, Igneous and metamorphic rocks of the Serpentine Hot Springs area, Alaska: U.S. Geological Survey Professional paper 1079, 27 p.
Reference (Deposit): Hudson, T.L., and Arth, J. G., 1983, Tin-granites of Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 94, p. 768-790.
Reference (Deposit): Sainsbury, C.L., Hudson, T.L., Kachadoorian, Reuben, Smith, T.E., Richards, T.R., and Todd, W.C., 1970, Geology, mineral deposits, and geochemical and radiometric anomalies, Serpentine Hot Springs area, Seward Peninsula, Alaska: U.S. Geological Survey Bulletin 1312-H, p. H1-H19.
Reference (Deposit): Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.
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