The Moghoweyik R. is a molybdenum 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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Moghoweyik R. MRDS details
Site Name
Primary: Moghoweyik R.
Secondary: Upper
Commodity
Primary: Molybdenum
Secondary: Copper
Location
State: Alaska
District: Bering Sea
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: Porphyry Mo, low-F
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: The biotite quartz monzonite is pyritized, cut by some quartz veins, and locally silicified. It is heavily oxidized and stained with limonite. Other alteration is probably present.
Rocks
Role: Host
Age Type: Host Rock
Age in Years: 108.000000+-3.200000
Age Young: Early Cretaceous
Analytical Data
Not available
Materials
Ore: Molybdenite
Gangue: Pyrite
Gangue: Quartz
Comments
Comment (Geology): Age = Mid-Cretaceous, the age of the host Sevuokuk pluton (108 +/- 3.2 Ma; Patton and Csejtey, 1980).
Comment (Exploration): Status = Inactive
Comment (Deposit): Model Name = Fracture fillings, veins, and disseminations of molybdenite in granitic rock. Deposit model 21b (?); porphyry Mo, low-F
Comment (Geology): Geologic Description = Molybdenite is sparsely distributed throughout a 1/2 mile wide zone in the eastern part of the Sevuokuk pluton near the contact with Cretaceous volcanic rocks. The Sevuokuk pluton is a mid-Cretaceous (108 +/- 3.2 Ma) composite body that includes biotite hornblende quartz monzonite and biotite quartz monzonite phases (Csejtey, Patton, and Miller, 1971; Patton and Csejtey, 1980). Here, pyritiferous and highly oxidized biotite quartz monzonite is cut by quartz veins and locally silicified. Molybdenite occurs as scales on fractures, in thin veinlets, and as large euhedral crystals in drusy quartz veins (Patton and Csejtey, 1971, p. C11). Three grab samples contained 500, 500, and 7 ppm molybdenum and 20, 150, and 1,000 ppm copper respectively (Patton and Csejtey, 1971, p. C8). Four stream sediment samples from the drainage headwatered in this mineralized area (Patton and Csejtey, 1972) contained only weakly anomalous concentrations of molybdenum (to 15 ppm) and copper (to 200 ppm).
Comment (Reference): Primary Reference = Patton and Csejtey, 1971 (PP 684-C)
Comment (Workings): Workings / Exploration = Three grab samples contained 500, 500, and 7 ppm molybdenum and 20, 150, and 1,000 ppm copper respectively (Patton and Csejtey, 1971, p. C8). Four stream sediment samples from the drainage headwatered in this mineralized area (Patton and Csejtey, 1972) contained only weakly anomalous concentrations of molybdenum (to 15 ppm) and copper (to 200 ppm).
Comment (Geology): Age = Chron age is for Host Rock.
References
Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1980, Geologic map of St. Lawrence Island, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1203, scale 1:250,000.
Reference (Deposit): Cobb, E.H., 1980, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File Report 80-909, 103 p.
Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Saint Lawrence quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-465, 1 sheet, scale 1:250,000.
Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1972, Analyses of stream sediment and rock samples from St. Lawrence Island, Alaska, 1966-1971: U.S. Geological Survey Open-File Report 72-293, 78 p.
Reference (Deposit): Csejtey, Bela, Jr., Patton, W.W., Jr., and Miller, T.P., 1971, Cretaceous plutonic rocks of St. Lawrence Island, Alaska, a preliminary report: U.S. Geological Survey Professional Paper 750-D, p. D68-D76.
Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1971, Preliminary geologic investigations of western St. Lawrence Island, Alaska: U.S. Geological Survey Professional Paper 684-C, p. C1-C15.
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