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

Spring Ridge

Prospect in Alaska, United States with commodities Zinc, Lead
Map
XML
JSON
KML
C
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 10307794
Record type Site
Current site name Spring Ridge

Geographic coordinates

Geographic coordinates: -154.13296, 63.4655 (WGS84)
Relative position The Spring Ridge prospects consists of two areas of mineralization about 1,000 feet apart on northwest spurs at 1,900 feet in elevation (580 m) in Section 25, T. 23 S., R. 23 E., of the Kateel River Meridian. Location is accurate within 1,000 feet (304 m).

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Medfra B-3(quadrangle 1:63,360 scale)

Medfra S(quadrangle 1:100,000 scale)

Medfra C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

North Fork Kuskokwim River(hydrologic unit)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Doyon, Limited(ANCSA Region)

ANCSA Region NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Zinc Critical Primary
Lead Secondary

Materials information

Materials Type of material
Smithsonite Ore
Dolomite Gangue

Alteration

  • (Local) Secondary dolomite in fractures.

Mineral occurrence model information

Model code 224
USGS model code 32a
Deposit model name Mississippi Valley, S.E. Missouri Pb-Zn
Mark3 model number 42

Host and associated rocks

  • Host or associated Host
    Rock type
    Stratigraphic age (youngest) Late Silurian

Nearby scientific data

(1) -154.13296, 63.4655
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = At the Spring Ridge prospects, smithsonite-bearing gossans occur on two adjacent ridge spurs about 1,000 feet (300 m) apart, and about 30 feet by 50 feet (9 m by 15 m) in size, in the lower part of the Whirlwind Creek Formation of Dutro and Patton (1982); this is unit 'Dda' of Andrews and Rishel (1982). Mineralization in both areas occur in well developed solution breccias in dolomite. Host rock is inferred to be Latest Silurian based on fossils; however, the age of the mineralization is unknown. A grab sample from surface exploration along the eastern spur yielded 2.72 percent zinc and 0.14 percent lead. Two grab samples from the western spur contained 9.07 percent zinc and 12.00 percent zinc respectively; no lead was detected in either sample (Andrews and Rishel, 1982).
  • Age = Host rock is inferred to be Latest Silurian based on fossils (Dutro and Patton, 1982); however, the age of the mineralization is unknown.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The Spring Ridge prospects were found by WGM Inc. and Patino Ltd. during base metal exploration conducted in the 1970s on lands selected by Doyon Ltd. (Andrews and Rishel, 1982). A grab sample from surface exploration along the eastern spur yielded 2.72 percent zinc and 0.14 percent lead. Two grab samples from the western spur contained 9.07 percent zinc and 12.00 percent zinc respectively; no lead was detected in either sample.

Reference information

Bibliographic references

  • Deposit

    Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, 1 sheet, scale l:250,000.

  • Deposit

    Andrews, Tom, and Rishel, John, 1982, Annual Report for 198, Reef Ridge I-to-XIII Project Areas, Kuskokwim Block, Alaska: Anchorage, Alaska, WGM Inc., Project Report 4, 45 pages, two sheets at 1:63,360 and 1:20,000 scales. (Report held by Doyon, Limited, Fairbanks, Alaska.)

  • Deposit

    Dutro, T.T. Jr., and Patton,W.W. Jr., 1982, New Paleozoic Formations in the northern Kuskokwim Mountains, west-central Alaska: U.S. Geological Survey Bulletin 1529-H, p. H13-H22.

  • Deposit

    Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.

Comments on the references

  • Primary Reference = Andrews and Rishel, 1982

General comments

Subject category Comment text
Deposit Model Name = Southeast Missouri Pb-Zn (Cox and Singer, 1986; model no. 32a) or Mississippi Valley Type
Deposit Other Comments = See Starship (MD043), Bermuda (MD045), and Bear Pass (MD044) Mississippi Valley Type occurrences in Medfra quadrangle. The Spring Ridge prospects are on land selected or conveyed to Doyon Ltd. For further infoemation, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.

Reporter information

Type Date Name Affiliation Comment
Reporter 02-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting

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.