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New Adit

Prospect in Alaska, United States with commodity Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10001562
MRDS ID A012310
Record type Site
Current site name New Adit
Related records 10136138, 10113116

Geographic coordinates

Geographic coordinates: -131.9829, 55.6078 (WGS84)
Relative position The New Adit prospect is at an elevation of about 350 feet, 0.3 mile east of Falls Creek and and about 0.7 mile north-northwest of the mouth of Falls Creek. The site is in section 19, T. 72 S., R. 88 E., of the Copper River Meridian. It corresponds to loc. 256 in Maas and others (1995, fig. 46). The location is accurate within 0.1 mile. ? Also see Additional comments.

Site location context

Political divisions (FIPS codes)

Prince of Wales-Hyder(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan C-6(quadrangle 1:63,360 scale)

Ketchikan NW(quadrangle 1:100,000 scale)

Ketchikan(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Southern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) The wallrock adjacent to the vein is bleached and pyritic.

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27
Model code 75
USGS model code 19c
Deposit model name Distal disseminated Ag-Au
Mark3 model number 18

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -131.9829, 55.6078
ListMap

Economic information

Comments on the geologic information

  • 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).
  • Age = The quartz fissure vein probably is Late Cretaceous.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Ketchikan

Comments on the workings information

  • 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).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Maas and others, 1995

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUN-1999 H.C. Berg U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.