1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (west head of Hugh Miller Glacier)

Occurrence in Alaska, United States with commodities Copper, Silver, Gold, Iron, Manganese
Map
XML
JSON
KML
C

Geologic information

Identification information

Deposit ID 10002260
MRDS ID A013163
Record type Site
Current site name Unnamed (west head of Hugh Miller Glacier)

Geographic coordinates

Geographic coordinates: -136.76711, 58.78472 (WGS84)
Relative position The occurrence is on a ridge west of the head of Hugh Miller Glacier at an elevation of about 4100 feet. It is about 0.75 mile east of Reid Glacier at a point about 4 miles above the terminous of the glacier at Reid Inlet. The location is accurate within 0.1 mile. The site of the occurrence is location number 50 of Kimball and others (1978).
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Gold Secondary
Iron Secondary
Manganese Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Pyrite Ore
Epidote Gangue
Garnet Gangue

Alteration

  • (Local) Marble has been converted to pyritic garnet-epidote skarn.

Mineral occurrence model information

Model code 58
USGS model code 18a
Deposit model name Porphyry Cu, skarn-related
Mark3 model number 9
Model code 62
USGS model code 18d
Deposit model name Skarn Fe

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Marble

Nearby scientific data

(1) -136.76711, 58.78472
ListMap

Comments on the geologic information

  • Geologic Description = The occurrence is in the middle Geickie province of Brew and others (1978). Rocks are mainly hornfels, phyllite, semischist and marble of Paleozoic age which are cut and locally contact metamorphosed by granitic bodies of Cretaceous age. At the mineral locality, pyrite-rich epidote-garnet skarn layers are as much as 3 feet thick. Locally, chalcopyrite and arsenopyrite are present in the skarn. Massive pyrite skarn contains as much as 1100 ppm copper, 1.5 ppm silver, 0.15 ppm gold, 5000 ppm manganese and greater than 20 percent iron (Kimball and others, 1978, p. C248, location 50).
  • Age = Cretaceous.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau

Comments on the workings information

  • Workings / Exploration = There are no mine workings; exposures limited to surface outcrops. Chip samples of pyrite-rich sulfide layers showed > 20 percent iron, from 730 to 1100 ppm copper and trace amounts of silver and gold (Kimball and others, 1978).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013163
USGS Alaska Resource Data File ARDF MF052

Bibliographic references

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Kimball and others, 1978

General comments

Subject category Comment text
Deposit Model Name = Iron-copper skarn somewhat similar to Cu skarn and Fe skarn (Cox and Singer, 1986; model 18b and 18d).
Deposit Other Comments = Cretaceous-aged mineralization of a terrane of Paleozoic age. The area is in Glacier Bay National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 09-APR-99 Hawley, C.C. Hawley Resource Group