The Monarch No. 1 and No. 2 is a gold 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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Monarch No. 1 and No. 2 MRDS details
Site Name
Primary: Monarch No. 1 and No. 2
Commodity
Primary: Gold
Secondary: Lead
Secondary: REE
Secondary: Silver
Location
State: Alaska
District: Juneau
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Low-sulfide Au-quartz vein
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Oligoclase replaces original plagioclase; chlorite, epidote, and calcite are other alteration products (MacKevett and others, 1971, p. 61).
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Gold
Ore: Arsenopyrite
Ore: Chalcopyrite
Ore: Galena
Ore: Marcasite
Ore: Pyrite
Ore: Sphalerite
Ore: Allanite
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Deposit): Model Name = Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Late Cretaceous or younger.
Comment (Deposit): Other Comments = the Monarch structures are weakly mineralized but relatively strong shear zones. Possibly ore might be found on short segments of northeast- striking veins exposed on the Monarch trend to the south. No prospecting is expected in the near future, because the veins are in Glacier Bay National Park and Preserve.
Comment (Geology): Geologic Description = The Monarch veins occur in granodiorite of Cretaceous age (Brew and others, 1978). Rossman (1959, B 1058-B) found two phases of granodiorite within the intrusion, but the differences were too subtle to be mapped.? the Monarch vein-bearing structures belong to a steep fault set of north to north-northwest strike; faults of this are relatively continuous. (Another member of the same set is the Incas vein-fault--MF023). A quartz-vein segment developed in the Monarch No. 1 crops out for 400 feet between 1875 and 2050 feet elevation. It is 1-5 feet thick and was explored for 225 feet in the Monarch No. 1 adit. The vein outcrop locally contained about 1 oz/ton gold (Reed, 1938, p. 63), but assays from underground mostly range from 0.01 to 0.03 ounce per ton gold. There has been little stoping in either Monarch No. 1 or No. 2 underground workings. ? Quartz veins or lenses at the Monarch deposits locally contain pyrite, arsenopyrite, galena and minor free gold. The maximum arsenic detected in 11 vein samples was 7000 ppm (MacKevett and others, 1971, table 11; also Kimball and others, 1978, table C42). Arsenic is much less abundant than in the Le Roy mine (MF022) where the arsenic content is occasionally more than 10 percent. Allanite is apparently a characteristic mineral of the granodiorite near the Monarch.
Comment (Reference): Primary Reference = Rossman, 1959 (B 1058-B); MacKevett and others, 1971
Comment (Commodity): Ore Material = Gold (native)
Comment (Workings): Workings / Exploration = The Monarch lodes were discovered in 1924 by Joe Ibach, while the National Monument was closed to mining. After the Monument was opened to mining in 1936, Monarch claims were staked by Ibach and Rex Beach. The adit on Monarch No. 1 is 225 eet long, mostly as a drift. Monarch No. 2 was developed with a 140-foot adit with two short drifts. Minor production came from surface cuts and possibly from a small overhand stope at 70 feet in the No. 1 adit. Reed (1938) sampled a surface exposure in the original Monarch five-claim area located by Joseph Ibach and Rex Beach; an exposed vein contained 0.97 ounce per ton gold, 0.50 ounce per ton silver and 1.08 percent zinc. Rossman (1959, p. 50) reported rich veins near the Monarch No. 1; he thought they were too narrow to be significant.
Comment (Production): Production Notes = A small production of gold, probably from surface cuts.
References
Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.
Reference (Deposit): Reed, J.C., 1938, Some mineral deposits of Glacier Bay and vicinity, Alaska: Economic Geology, v. 33, p. 52-80.
Reference (Deposit): Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.
Reference (Deposit): Rossman, Darwin, 1959, Geology and ore deposits in the Reid Inlet area, Glacier Bay, Alaska: U.S. Geological Survey Bulletin 1058-B, p. 33-58.
Reference (Deposit): Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.
Reference (Deposit): MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.
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