The Tibbit is a zinc and copper 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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Tibbit MRDS details
Site Name
Primary: Tibbit
Commodity
Primary: Zinc
Primary: Copper
Secondary: Silver
Secondary: Gold
Location
State: Alaska
District: Copper River
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Massive sulfide, Cyprus
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrrhotite
Ore: Pyrite
Ore: Chalcopyrite
Comments
Comment (Workings): Workings / Exploration = The deposit was explored in the early 1900s by four adits and by open cuts (Cobb, 1979: MF-392). However, in the 1980s only one 20 ft. adit could be found (Jansons and others, 1984). Jansons and others (1984) report that two grab samples contained 0.59% and 2% Cu, and 1.8 ppm and 6.4 ppm Ag, and that two chip samples contained 430 ppm and 0.93% Cu, 240 ppm and 0.13% Zn, and 3.4 ppm and 12.7 ppm Ag. Cobb (1979: OFR 79-973) reported one assay value of 1.9 oz Au/ton.
Comment (Deposit): Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Comment (Deposit): Other Comments = Nelson and others (1985) interpret the country rocks as accreted ocean crust. Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area.. Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.
Comment (Exploration): Status = Inactive
Comment (Reserve-Resource): Reserves = Inferred reserves of 500 tons @ 0.72% Cu.
Comment (Geology): Age = Probably Tertiary based on the age of the host rocks.
Comment (Reference): Primary Reference = Jansons and others, 1984
Comment (Geology): Geologic Description = The country rocks at this prospect are mafic volcanic rocks and sedimentary rocks of the Tertiary Orca Group (Nelson and others, 1985). The deposit consists of chalcopyrite, pyrite, and pyrrhotite in one- to eight- foot wide shear zones (Cobb, 1979: MF-392). Jansons and others (1984) report that two grab samples contained 0.59% and 2% Cu, and 1.8 ppm and 6.4 ppm Ag; two chip samples contained 430 ppm and 0.93% Cu, 240 ppm and 0.13% Zn, and 3.4 ppm and 12.7 ppm Ag. Cobb (1979: OFR 79-973) reported one assay value of 1.9 oz Au/ton.
References
Reference (Deposit): Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Cordova quadragle, Alaska: U.S. Geological Survey Open-file Report OF 79-973, 73 p.
Reference (Deposit): Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Reference (Deposit): Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, Southcentral Alaska: U.S. Bureau of Mines Open-File Report 5-84, 218 p., 2 sheets, scale 1:250,000.
Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Cordova quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-392, 1 sheet, scale 1:250,000.
Reference (Deposit): Crowe, D.E., Nelson, S.W., Brown, P.E., Shanks III, W.C., and Valley, J.W., 1992, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska: Economic Geology, v. 87, p. 1722-1746.
Reference (Deposit): Crowe, D.E., Nelson, S.W., Brown, P.E., Shanks III, W.C., and Valley, J.W., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska-A reply: Economic Geology, v. 88, p. 1285-1288.
Reference (Deposit): Sainsbury, C.L., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska, A discussion: Economic Geology, v. 88, p. 1284-1285.
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