The Iron No. 1-4 is a copper, gold, and silver 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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Iron No. 1-4 MRDS details
Site Name
Primary: Iron No. 1-4
Secondary: Shaft Creek Copper
Commodity
Primary: Copper
Primary: Gold
Primary: Silver
Location
State: Alaska
District: Hyder
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: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Alteration Text: Volcanic (greenstone) hostrocks are impregnated with sulfide minerals.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Arsenopyrite
Ore: Chalcopyrite
Ore: Galena
Ore: Pyrrhotite
Ore: Sphalerite
Gangue: Quartz
Comments
Comment (Deposit): Model Name = Polymetallic veins
Comment (Geology): Geologic Description = The country rocks in the general area of this site are pelitic metasedimentary and subordinate andesitic metavolcanic (greenstone) strata of the Jurassic or older Mesozoic Hazelton Group; the Triassic Texas Creek Granodiorite, which underlies and locally intrudes the Hazelton; the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks; and still-younger Tertiary lamprophyre dikes, which cut all the other rocks (Smith 1973, 1977; Koch, 1996). Maas and others (1995, p. 252, 260) describe the deposits as veins, disseminations, and masses of gold-bearing pyrrhotite with associated chalcopyrite and arsenopyrite, and local sphalerite and galena. Individual mineralized zones range from about 60-450 feet wide and are located near or in shears in Hazelton volcanic rocks (greenstone). The prospects roughly align with the contact between Hazelton volcanics and Texas Creek Granodiorite, and are never more than about 1300 feet in lateral distance from the surface exposure of that contact. Maas and others (p. 252) suggest that the age of the deposits is Jurassic, based on similarities in mineralogy, structural setting, and hostrock, with isotopically-dated Jurassic deposits nearby in the Hyder district (for example, see BC065, 067), and at the Scottie gold mine nearby in British Columbia (Alldrick, 1993). If so, the deposits are contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).
Comment (Workings): Workings / Exploration = The prospects have been explored by small pits and trenches; there is a flooded shaft on Shaft Creek Copper prospect. Various samples of the deposits collected by the U. S. Bureau of Mines in 1992 or 1993 (Maas and others, 1995. p. 260) contain up to 14.74 ppm Au (Iron No. 2), 64.11 ppm Ag (Iron No. 4), 17.3% Cu (Shaft Creek Copper), 6370 ppm Pb (Iron No. 4), and 6840 ppm Zn (Iron No. 4).
Comment (Geology): Age = Maas and others (1995, p. 252) suggest that the age of the deposits is Jurassic, based on similarities in mineralogy, structural setting, and hostrock, with isotopically-dated Jurassic deposits nearby in the Hyder district (for example, see BC065, 067), and at the Scottie gold mine nearby in British Columbia (Alldrick, 1993). If so, the deposits are contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).
Comment (Production): Production Notes = Small amount of ore stored at Shaft Creek Copper prospect.
Comment (Reference): Primary Reference = Maas and others, 1995
References
Reference (Deposit): Smith, J.G., 1973, A Tertiary lamprophyre dike province in southeastern Alaska: Canadian Journal of Earth Sciences, v. 10, p. 408-420.
Reference (Deposit): Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p.
Reference (Deposit): Alldrick, D.J., 1993, Geology and metallogeny of the Stewart mining camp, northwestern British Columbia: British Columbia Department of Mines and Petroleum Resources Bulletin 85, 105 p., 2 plates.
Reference (Deposit): Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.
Reference (Deposit): Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000.
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