New Adit

The New Adit 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: New Adit

Commodity

Primary: Gold

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: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Distal disseminated Ag-Au
Model Name: Low-sulfide Au-quartz vein

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The wallrock adjacent to the vein is bleached and pyritic.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Gold
Ore: Pyrite
Gangue: Quartz

Comments

Comment (Deposit): Model Number = 36a, 19c?

Comment (Geology): Age = The quartz fissure vein probably is Late Cretaceous.

Comment (Workings): Workings / Exploration = The vein was explored, probably in the early 1900s, by an adit of unknown length. Assays of samples taken across the vein show up to 26.9 ppm Au (Maas and others, 1995, table 26).

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

Comment (Geology): Geologic Description = Maas and others (1995, p. 183 and fig 46) describe the country rocks in the area of this site as felsic schist and metavolcanic rocks (greenstone). Berg and others (1988, p. 17-19) describe them as gray and green phyllite and semischist derived from intertonguing flysch and andesitic and basaltic volcanic rocks. The strata were regionally metamorphosed to greenschist grade in Late Cretaceous time (Brew, 1996, p. 27). Their premetamorphic age is uncertain. Berg and others (1988, p. 17) note that they closely resemble Upper Jurassic to mid-Cretaceous marine flysch and volcanic rocks nearby on Gravina Island.? the deposit is a 1.8-foot-thick auriferous quartz fissure vein in felsic schist (Maas and others, 1995, p. 183, table 26, and fig. 46). The mineralization is not described, but it probably consists of pyrite, which may also occur in bleached wallrock adjacent to the vein. The vein was explored, probably in the early 1900s, by an adit of unknown length. Assays of samples taken across the vein show up to 26.9 ppm Au (Maas and others, 1995, table 26).? Maas and others (1995, p. 184 and fig. 46) describe a unit of bleached, chlorite-sericite schist containing varying amounts of pyrite that crops out along the northeast shore of Smugglers Cove. An adjacent schist unit contains more chlorite than sericite. The cumulative width of the two units is up to 90 feet and they have been traced northward along strike for nearly 4200 feet. A gold-bearing horizon that includes the New Adit prospect occurs near the contact between these two units. Maas and others suggest that this gold-bearing pyritic belt of schists is of volcanic-exhalative origin. The age of the postulated exhalative deposits is unknown. The quartz fissure vein at the New Adit, which presumably crosscuts the foliation in the schist, probably is Late Cretaceous (also see KC028).

Comment (Deposit): Model Name = Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a); Distal disseminated Ag-Au? (Bliss, 1992; model 19c)

Comment (Deposit): Other Comments = This record is based mainly on a description of the New Adit prospect by Maas and others (1995, loc. 256 on fig. 46). Earlier reports (Brooks, 1902, p. 57: summarized in Elliott and others, 1978, loc. 35; and in Cobb and Elliott, 1980, p. 64) place the Last Chance prospect (KC033) at approximately the same location at the New Adit, but Maas and others indicate that the Last Chance instead is adjacent to the Old Glory mine (KC033).

References

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): 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): 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): 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): 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): 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.

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