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

Big Gate

Occurrence 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. Alteration
  7. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10307795
Record type Site
Current site name Big Gate

Geographic coordinates

Geographic coordinates: -154.15895, 63.4375 (WGS84)
Relative position The Big Gate zinc occurrence is located at an elevation of approximately 1,700 feet (518 m), east of the North Fork of Soda Creek in Section 1, T. 24 S., R. 24 E., of the Kateel River Meridian. Location is known to within 250 feet (76 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

Comments on the commodity information

  • Gangue = Mineralized gossan

Alteration

  • (Local) Secondary dolomite.

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) Silurian

Nearby scientific data

(1) -154.15895, 63.4375
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Big Gate iron-rich gossan occurs in the Beaver Dolomite of Andrews and Rishel (1982), the same unit hosting mineralization at the Hillside (MD0049), Beaver (MD048), and Bermuda (MD045) Mississippi Valley Type showings. The gossan occurs in an irregular zone with an approximate surface diameter of 200 feet (61 m). Host units are inferred to be Silurian from fossils (Dutro and Patton, 1982). The age of the mineralization is unknown. Grab samples contained up to 0.1 percent lead and 2.0 percent zinc (Andrews and Rishel, 1982).
  • Age = Host units are inferred to be Silurian from fossils (Dutro and Patton, 1982). The age of the mineralization is unknown.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The Big Gate gossan was discovered by WGM Inc. and Patino Ltd. during exploration for base metals in the late 1970s on lands selected by Doyon Ltd. (Andrews and Rishel, 1982). Surface grab samples contained up to 0.1 percent lead and 2.0 percent zinc.

Reference information

Bibliographic references

  • 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

    Blodgett, R.B., 1982, Stratigraphy of Reef Ridge project area: WGM Inc., Anchorage, Alaska, Reef Ridge Project area, Block 10, Doyon region: 34 pages.

  • 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.

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 Hillside (MD049), Beaver (MD048), and Bermuda (MD045) Mississippi Valley Type occurrences. The Big Gate occurrence is on land selected or conveyed to Doyon Ltd. For further information, 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.