Gold Mountain: Annie

The Gold Mountain: Annie 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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Site Name

Primary: Gold Mountain: Annie
Secondary: Mountain Top
Secondary: Starry Banner
Secondary: Fannie
Secondary: Gold Dollar
Secondary: Jewel
Secondary: Gertrude
Secondary: Annex no. 1
Secondary: Lone Jack (Gold Mountain)

Commodity

Primary: Gold
Secondary: Lead
Secondary: Copper

Location

State: Alaska
District: Ketchikan

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: Locally, the wallrock next to the veins are bleached and pyritized.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Gold
Ore: Galena
Ore: Chalcopyrite
Gangue: Quartz
Gangue: Epidote
Gangue: Calcite

Comments

Comment (Geology): Age = Late Cretaceous.

Comment (Reference): Primary Reference = Brooks, 1902; Maas and others, 1995

Comment (Workings): Workings / Exploration = The Gold Mountain deposits were explored in the early 1900s by various underground workings accumulating more than 600 feet (Wright and Wright, 1908, p. 156). On the Annie claim, a 20-foot shaft was sunk on an ore pocket around 1900, and a 450-foot tunnel with a 50-foot winze and drift was completed by about 1906. The Mountain Top claim was explored by shallow shafts and opencuts; and the Starry Banner was explored by a 225-foot tunnel. Maas and others (1995, table 26) describe the following workings on several of the properties. Annie: two adits, 380 and 360 feet long, and two shafts; Lone Jack (Gold Mountain): two adits, 36 and 72 feet long; Mountain Top: two flooded shafts; Jewel: one 160-foot adit.? Assays reported by the owners in the early 1900s ranged in gold values from $4 to several thousand dollars per ton (Au at $20.67/oz.) (Brooks, 1902, p. 58-59). Maas and others (1995, table 25) report the following average metal contents in their samples from several of the properties at this site. Annie: 4.92 ppm Au, 0.92 ppm Ag, 82 ppm Cu, 10.4 ppm Pb, and 88 ppm Zn. Lone Jack (Gold Mountain): 1.0 ppm Au, 0.27 ppm Ag, 125 ppm Cu, 8.1 ppm Pb, and 78 ppm Zn. Mountain Top: 0.45 ppm Au, 0.2 ppm Ag, 45 ppm Cu, 5.0 ppm Pb, and 57 ppm Zn. Jewel: 6.73 ppm Au, 0.97 ppm Ag, 73 ppm Cu, 6.0 ppm Pb, and 61 ppm Zn.

Comment (Deposit): Model Name = Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a)

Comment (Production): Production Notes = Maas and others (1995, table 26) report production in the early 1900s of 7.9 kg of gold from the Annie lode.

Comment (Geology): Geologic Description = The country rocks in the area of Gold Mountain are marine, andesitic and basaltic metavolcanic rocks that are gradationally interbedded with flyschlike metasedimentary rocks (Berg and others, 1988, p. 18). The strata were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time (Brew, 1996, p. 27). The depositional age of the strata is uncertain. Berg and others (1998, p. 17) report that they closely resemble Upper Jurassic to mid-Cretaceous marine strata nearby on Gravina Island. ? the deposits at this site are in basaltic or andesitic metavolcanic rocks (greenschist), and consist of quartz-calcite fissure veins and stringer lodes that contain pyrite, chalcopyrite, galena, and free gold, locally in pockets of bonanza ore (Brooks, 1902, p. 58-59; Wright and Wright, 1908, p. 156). Telluride minerals have also been reported. The sulfides, along with some gold, also are disseminated in the country rocks adjacent to the veins. The deposits vary in width and structural attitude. A quartz stringer lode on the Annie claim is 10.5-20 feet wide and strikes N30W, parallel to the foliation of the greenschist hostrock; some veins in this lode are as much as one foot thick. Maas and others (1995, p. 184) report that the ore at the Annie mine is concentrated in distinct shoots controlled by vertical warps in the faults that carry the veins, rather than evenly distributed in the veins. An 8-inch quartz vein on the Starry Banner claim also strikes northeast, parallel to the foliation. On the Mountain Top claim, an 8-inch vein that strikes N25W and dips 25 NE crosscuts the foliation of the greenschist. The country rocks near this vein contain calcite and epidote veinlets, and, near the surface, the sulfide minerals are oxidized. Maas and others (1995, p. 183) report that the wallrock near some of the veins are bleached and pyritized.? Fluid inclusion studies of quartz vein material from several of the Helm Bay lodes suggest that the veins formed at temperatures and pressures consistent with conditions during the Late Cretaceous greenschist-grade regional metamorphism (Maas and others, 1995, p. 184).

References

Reference (Deposit): Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000.

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): Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map MF-1807,27 p., scale 1:250,000.

Reference (Deposit): Cobb, E.H., and Elliott, R.L., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-1053, 154 p.

Reference (Deposit): Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

Reference (Deposit): Brooks, A.H., 1902, Preliminary report on the Ketchikan mining district, Alaska, with an introductory sketch of the geology of southeastern Alaska: U.S. Geological Survey Professional Paper 1, 120 p.

Reference (Deposit): Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.

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