Unnamed (Ferndale Creek)

Prospect in Alaska, United States with commodities Silver, Lead, Zinc, Copper, Tin

Geologic information

Identification information

Deposit ID 10307270
Record type Site
Current site name Unnamed (Ferndale Creek)

Geographic coordinates

Geographic coordinates: -164.54342, 65.82933 (WGS84)
Relative position This occurrence is on a flat ridge crest at an elevation of 2,220 feet; it overlooks the headwaters of Hot Springs Creek and Ferndale Creek (a tributary to Humbolt Creek, Hudson, 1979, Plate 1). It is one mile north of the continental divide and 2,000 feet east of outcrops of the Oonatut Granite Complex (Hudson, 1979).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Lead Primary
Zinc Primary
Copper Secondary
Tin Secondary

Comments on the commodity information

  • Gangue = iron oxides

Materials information

Materials Type of material
Clay Gangue
Quartz Gangue

Alteration

  • (Local) Iron-oxide staining and bleached discoloration are common; some clay development is probably present.

Nearby scientific data

(1) -164.54342, 65.82933

Comments on the geologic information

  • Geologic Description = A very fine-grained granite dike trends N 80 W west and intrudes hornfels in the country rocks to the Oonatut Granite Complex here (Hudson, 1979). This dike and adacent country rocks have been altered and rust-stained soils, rock fragments, and small gossan fragments are localized along the trend of the dike. The presence of slickensided rock fragments in the soils suggests that the dike was emplaced along a fault that has had recurring movement. Twelve composite grab samples of soil, altered rocks, and gossan fragments collected across the altered zone contain up to 150 ppm Ag, 10,000 ppm As, 200 ppm Cd, 500 ppm Cu, greater than 20,000 ppm Pb, greater than 10,000 ppm Zn, and 700 ppm Sn. Gold was not determined (Hudson, 1979, p. 26). The length of the altered zone that was sampled is about 1,000 feet. This altered zone is interpreted to have developed above buried parts of the Oonatut Granite Complex and to be related to its crystallization. The Oonatut Granite is part of the western Seward Peninsula tin granite suite (Hudson and Arth, 1983) and the polymetallic character of this mineralization may be reflective of the lead-zinc zone in tin deposit systems (Hudson, 1979).
  • Age = Probably Late Cretaceous; this occurrence is thought to be related to emplacement and crystallization of the Oonatut Granite Complex. K/Ar ages for the Oonatut Granite Complex are about 70 my (Hudson, 1979).

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Fairhaven

Comments on the workings information

  • Workings / Exploration = Shallow hand-dug prospect pits may be present.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF BN050

Bibliographic references

  • Deposit

    Hudson, T.L., 1979, Igneous and metamorphic rocks of the Serpentine Hot Springs area, Alaska: U.S. Geological Survey Professional paper 1079, 27 p.

  • Deposit

    Hudson, T.L., and Arth, J. G., 1983, Tin-granites of Seward Peninsula, Alaska: Geological Society of America Bulletin, v. 94, p. 768-790.

  • Deposit

    Sainsbury, C.L., Hudson, T.L., Kachadoorian, Reuben, Smith, T.E., Richards, T.R., and Todd, W.C., 1970, Geology, mineral deposits, and geochemical and radiometric anomalies, Serpentine Hot Springs area, Seward Peninsula, Alaska: U.S. Geological Survey Bulletin 1312-H, p. H1-H19.

Comments on the references

  • Primary Reference = Hudson, 1979

General comments

Subject category Comment text
Deposit Model Name = Sulfide veining or impregnations in hornfels and granite dike

Reporter information

Type Date Name Affiliation Comment
Reporter 15-MAR-99 Travis L. Hudson Applied Geology