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Golden Zone Mine

Past Producer in Alaska, United States with commodities Gold, Silver, Copper, Lead, Zinc, Antimony, Tin
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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. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10100957
MRDS ID A011313
Record type Site
Current site name Golden Zone Mine

Geographic coordinates

Geographic coordinates: -149.65172, 63.21319 (WGS84)

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Healy A-6(quadrangle 1:63,360 scale)

Healy S(quadrangle 1:100,000 scale)

Healy(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chulitna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • MINERALIZED BRECCIA ZONE IN QUARTZ CLIORITE PORPHYRY STOCK, PLOTTED FROM USBM OFR 24-78, FIG. 4.2-A(1); INCLUDES GOLDEN ZONE EXTENSION LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Primary
Lead Secondary
Zinc Critical Tertiary
Antimony Critical Tertiary
Tin Critical Tertiary

Comments on the commodity information

  • DEPOSIT CONTAINS SIGNIFICANT AMOUNT OF MINERALIZED ROCK CARRYING ABOVE 0.05 OZ/TON IN AU

Materials information

Materials Type of material
Arsenopyrite Ore
Cassiterite Ore
Galena Ore
Malachite Ore
Pyrite Ore
Sphalerite Ore
Stibnite Ore
Epidote Gangue
Tourmaline Gangue

Alteration

  • (Local) Pervasive Sericitization, Quartz Flooding And Formation Of Fe Bearing Carbonate In Breccia Pipe

Analytical data

Result 100 FT LEVEL: 0.18 OZ/TON AU, 3.4 OZ/TON AG, 10.4% FE, 4.1% AS, 0.97% CU, 0.05% PB, 0.32% ZN
Result 200 FT LEVEL: 0.23 OZ/TON AU, 1.25 OZ/TON AG, 9.5% FE, 14.9% AS, 0.24% CU, 0.05% PB, 0.05% ZN, COMPOSITE CHANNEL SAMPLES USED IN MILL TESTS, USGS PP 758-B, P. B15
Result ATOMIC ABSORPTION ANALYSIS OF ARSENOPYRITE-RICH VEIN: 36.0 PPM AU, 30 PPM AG, GREATER THAN 10,000 PPM AS, 15 PPM BI
Result 10PPM CO, 2000 PPM CU, 15PPM NI, 500 PPM PB, 500 PPM SB, 15 PPM NI, 3 PPM FE
Result ARSENOPYRITE-RICH BRECCIA: 14.8 PPM AU, 105 PPM AG, GREATER THAN 10,000 PPM AS, 50PPM BI, TRACE CO, 5000 PPM CU, TRACE NI, 700 PPM PB, 500 PPM SB, 50PPM SN, 2000 PPM ZN, 15 PPM FE, (SEMIQUANTITATIVE DATA), USGS PP 758-B, P. B16 TABLE 4

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Stratigraphic age (youngest) Paleocene
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Golden Zone Stock
    Rock description Golden Zone Stock

Nearby scientific data

(1) -149.65172, 63.21319
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Bryn Mawr Fault Bounds The Eastern Extent Of Golden Zone Mineralization

Ore body information

  • General form PIPE
    Length 91.44M
    Width 60.96M
    Depth to bottom 457.2M

Controls for ore emplacement

  • High Grade Ore Concentrated In Outer Marginal Zone Of Breccia Pipe Approximately 60 Ft Wide

Comments on the geologic information

  • GOLDEN ZONE STOCK IS INTRUDED INTO PERMIAN AND TRIASSIC RED BEDS CONTAINING MINOR UNITS OF BASALT AND CRYSTALLINE TUFF, WHICH LIE UNCONFORMABLY OVER A PRE PERMIAN BASEMENT OF ARGILLITE AND INTERLAYERED ARGILLITE-GRAYWACKE; TERRANE IS FOLDED, LOCALLY OVERTURNED AND COMPLEXLY FAULTED, AND CUT BY TERTIARY INTRUSIVES RANGING IN COMPOSITION FROM ULTRAMATIC TO GRANITIC. BIOTITE QUARTZ DIORITE PORPHYRY AGE IS LCRET-TERT K/AR 68.0 + 2.0, ADGGS GR 55, P.27.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1909
Year of first production 1941
Year of last production 1942

Comments on the production information

  • AVERAGE GRADE OF 1480 OF THE 1730 TONS OF ORE PRODUCED WAS 0.99 OZ/TON AU, 4.5 OZ/TON AG, 1.4% CU., USGS CIRC 564. P.9

Comments on the reserve resource information

  • USGS CIRC 564, P.9

Workings at the site

  • Type of workings Surface/Underground
    Length 579.12M
    Overall depth 152.4M

Comments on the workings information

  • SURFACE TRENCHES, OPEN CUTS AND ADITS AT THE 100, 200 AND 500 FT LEVELS; 1900 FT OF WORKINGS (EXCLUDING 500 FT LEVEL); 500 FT LEVEL CROSSCUT WAS DRIVEN 1350 FT BUT WAS ABANDONED 900 FT SHORT OF THE DEPOSIT; 200 FT LEVEL PARTLY CAVED AND FILLED WITH WATER IN 1951; 500 FT LEVEL INACCESSIBLE

Comments on development

  • FAIRLY EXTENSIVE DRILLING DATA IS AVAILABLE IN USBM OFR 24-78, P.4-78 TO 4-85

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit BRECCIA PIPE IN BIOTITE QUARTZ DIORITE PORPHRY; RELATIVELY HIGH GRADE ORE IN OUTER MARGINAL ZONE COMPOSED OF SLIGHTLY ROTATED ANGULAR BLOCKS OF ALTERED PORPHYRY CEMENTED IN A MATRIX OF ARSENOPYRITE, QUARTZ AND CUT BY MANY SMALL QUARTZ SULFIDE VEINS; LEAN INNER CORE OF PIPE IS SHATTERED QUARTZ PORPHYRY CARRYING SULFIDES DISSEMINATED AND ON FRACTURE SURFACES; HALO OF SLIGHTLY MINERALIZED (0.04 OZ/TON AU) PORPHYRY SURROUNDS THE PIPE
Deposit MOST IMPORTANT MINE OF THE DISTRICT; ANOMALOUS AMOUNTS OF SN, MO, BI, CD, AND B REPORTED; DRILL CORE DATA AND MILL TESTS SUGGEST A PERIPHERAL AND UPWARD ENRICHMENT OF CU AND AU RELATIVE TO AS; IT APPEARS GEOLOGICALLY POSSIBLE, BASED ON THE SIZE OF AEROMAGNETIC AND GEOCHEMICAL ANOMALIES, THAT THE EXISTING BRECCIA PIPE IS A SURFACE EXPRESSION OF A DEPOSIT IN THE TENS OF MILLIONS OF TONS CLASS, USBM OFR 24-78, P. 4-85 ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1984 Leonard, Kenneth R. (Elliott, R. L.) U.S. Geological Survey
Editor 13-APR-1994 Mosier, Dan U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

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.