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Marble Copper

Prospect in Alaska, United States with commodities Copper, Silver, Gold, Lead, Zinc
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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 10001554
MRDS ID A012301
Record type Site
Current site name Marble Copper

Geographic coordinates

Geographic coordinates: -130.86982, 55.72365 (WGS84)
Relative position The Marble Copper prospect is on the north shore of Walker Cove about 1.4 miles from its mouth. The site is in section 9, T. 71 S., R. 95 E., of the Copper River Meridian. It corresponds to loc. P-19 in Berg and others (1977, p. 120-121), and to loc. 24 in Elliott and others (1978). The location is accurate within 0.1 mile.

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-3(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

Misty Fiords National Monument Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Misty Fjords National Monument Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Gold Secondary
Lead Secondary
Zinc Critical Secondary

Comments on the commodity information

  • Gangue = calc-silicate minerals

Materials information

Materials Type of material
Chalcopyrite Ore
Malachite Ore
Calcite Gangue

Alteration

  • (Local) Local oxidation of copper minerals.

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Marble

Nearby scientific data

(1) -130.86982, 55.72365
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the area of the Marble Copper prospect are Tertiary or Cretaceous foliated granodiorite and quartz diorite of the Coast Range batholith, and paragneiss and minor marble that form metamorphic roof pendants, screens, and inclusions in the batholith (Berg and others, 1977, p. 120-121; Berg and others, 1988). The metamorphic rocks represent marine strata that underwent high-grade regional metamorphism in Cretaceous or Tertiary time. The premetamorphic age of the strata is uncertain, but they probably are mainly Paleozoic and may be as old as Precambrian (Berg and others, 1988, p. 26; Gehrels and others, 1990; Crawford and others, in press).? the deposit consists of chalcopyrite and malachite in a marble-skarn zone in a paragneiss roof pendant in gneissic diorite and quartz diorite (Berg and others, 1977, p. 120-121 and fig. 33). The marble-skarn zone is about 20 feet wide, and it adjoins a zone of paragneiss and subordinate marble and skarn about 60 feet wide. the calc-silicate minerals in the skarn are not described, but their green color (fig. 33, spl. no. 2K008) suggests that they include diopside. A 22-inch-long channel sample of the most heavily copper-stained part of the marble-skarn zone assayed up to 0.7% Cu, 150 ppm Pb, 300 ppm Zn, 30 ppm Ag, and 3.5 ppm Au (Berg and others, 1977, fig. 33, spl. no. 2K009). Adjacent channel samples showed much lower assay values, and a chip sample of a second band of marble northeast of the marble-skarn zone showed only traces of copper. The prospect was explored sometime before 1972 by a shallow opencut, but there was no evidence in 1973 that any claims had been staked.
  • Age = Probably Cretaceous or younger.

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 prospect was privately explored sometime before 1972 by a shallow opencut, but there was no evidence in 1973 that any claims had been staked. A 22-inch-long channel sample of the most heavily copper-stained part of the marble-skarn zone assayed up to 0.7% Cu, 150 ppm Pb, 300 ppm Zn, 30 ppm Ag, and 3.5 ppm Au (Berg and others, 1977, fig. 33, spl. no. 2K009). Adjacent channel samples showed much lower assay values, and a chip sample of a second band of marble northeast of the marble-skarn zone showed only traces of copper.

Reference information

Comments on the references

  • Primary Reference = Berg and others, 1977

General comments

Subject category Comment text
Deposit Model Name = Cu skarn (Cox and Singer, 1986; model 18b)
Deposit Other Comments = Prospect is in Misty Fiords National Monument Wilderness.

Reporter information

Type Date Name Affiliation Comment
Reporter 29-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.