Rhodo

Prospect in Alaska, United States with commodities Silver, Gold, Arsenic, Copper, Mercury, Lead, Zinc

Geologic information

Identification information

Deposit ID 10308161
Record type Site
Current site name Rhodo

Geographic coordinates

Geographic coordinates: -160.47172, 55.28954 (WGS84)
Relative position This prospect is at an elevation of about 300 feet, on a bluff overlooking Popov Strait west of Red Cove ( Wilson and others, 1988, locality 45). The map site is about 0.3 mile south of hill 545, in sec. 33, T. 56 S., R. 73 W., of the Seward Meridian. The location is accurate to within 500 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Arsenic Secondary
Copper Secondary
Mercury Secondary
Lead Secondary
Zinc Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Calcite Gangue
Quartz Gangue
Rhodonite Gangue
Siderite Gangue

Alteration

  • (Local) The wall rocks exhibit strong carbonate alteration accompanied by pyrite.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -160.47172, 55.28954

Comments on the geologic information

  • Geologic Description = The Rhodo vein system, exposed over a 400-foot vertical extent, cuts andesite of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). The system is 4 to 5 feet thick, and consists of quartz-carbonate veins containing chalcopyrite, galena, sphalerite, and pyrite. The veins are generally fine grained with very few vugs or open-growth features. The veins are unique for this area in containing the carbonate gangue minerals calcite, rhodonite, and siderite. There may be a vertical zonation marked by increased base metals at lower elevations (Peterson and others, 1982). Eight channel samples contained as much as 0.13 ppm gold, 1.3 ppm silver, 290 ppm copper, 1,830 ppm lead, 198 ppm zinc, 310 ppm arsenic, and 0.45 ppm mercury. Six grab samples contained as much as 5.46 ppm gold, 108 ppm silver, 2,200 ppm copper, 7.88 percent lead, 8.4 percent zinc, 140 ppm arsenic, and 1.5 ppm mercury (Peterson and others, 1982).
  • Age = Eocene or younger.

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = UNC Teton Exploration Drilling Company collected 14 samples of this deposit. Their channel samples contained as much as 0.13 ppm gold and 1.3 ppm silver; their grab samples contained as much as 5.46 ppm gold, 108 ppm silver, 2,200 ppm copper, 7.88 percent lead, 8.4 percent zinc, 140 ppm arsenic, and 1.5 ppm mercury. Earlier workers drove a short adit on the prospect (Wilson and others, 1988).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF PM100

Bibliographic references

  • Deposit

    Peterson, R.J., Lemmers, J., Handverger, P., Gallagher, J., Pilcher, R., East, J., Macleod, T., Bartels. E., 1982, Geology and precious metals potential Unga, Popof, and Korovin Islands, Shumagin Group, Aleutian Chain, Alaska: UNC Teton Exploration Drilling Company report, 127 p., 5 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., scale 1:250,000.

  • Deposit

    Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 map sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Peterson and others, 1982

General comments

Subject category Comment text
Deposit Model Name = Epithermal gold vein, Polymetallic veins (Cox and Singer, 1986; model 22c)
Deposit Other Comments = the site is located on land patented by, or interim-conveyed to, the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 16-JAN-01 S.H. Pilcher U.S. Geological Survey