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Jumbo Mine

Past Producer in Alaska, United States with commodities Copper, Gold, Silver, Iron, Zinc, Molybdenum
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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. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Production statistics
  11. Reserves and resources
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10000496
MRDS ID A010683
Record type Site
Current site name Jumbo Mine
Alternate or previous names Magnetite Cliff, Copper Mountain
Related records 10234136

Geographic coordinates

Geographic coordinates: -132.62124, 55.25251 (WGS84)

Site location context

Political divisions (FIPS codes)

Prince of Wales-Hyder(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Craig B-2(quadrangle 1:63,360 scale)

Craig SE(quadrangle 1:100,000 scale)

Craig(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Prince of Wales(hydrologic unit)

Southern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Gold Primary
Silver Primary
Iron Tertiary
Zinc Critical Tertiary
Molybdenum Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Magnetite Ore
Molybdenite Ore
Specularite Ore
Sphalerite Ore
Epidote Gangue
Garnet Gangue
Pyrite Gangue
Pyrrhotite Gangue
Scapolite Gangue
Wollastonite Gangue

Analytical data

Result WEIGHTED AVERAGES OF CHANNEL SAMPLES ON MAGNETITE BODIES: 0.67% CU, 43.4% FE, 0.012 OZ/TON AU, 0.90 OZ/TON AG

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -132.62124, 55.25251
ListMap

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1903
Year of last production 1919

Production statistics

  • Year 1906
    Period 1903-1906
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Copper Copper 2wt-pct
    Major Ore Gold Gold 1g/mt
    Major Ore Silver Silver 51g/mt
  • Year 1919
    Period 1907-1919
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 20g/mt
    Major Ore Gold Gold 2g/mt
    Major Ore Copper Copper 4wt-pct

Comments on the production information

  • LINE 15 IS JUMBO MINE PRODUCTION; LINE 16 IS COPPER MOUNTAIN PRODUCTION

Reserves and resources

  • Type In-situ
    Estimate year 1953
    Total resources 167000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.73 wt-pct Copper Major 1953
    Gold Au 0.4115 g/mt Gold Major 1953
    Silver Ag 30.86 g/mt Silver Major 1953
    Iron Fe 45 wt-pct Iron Trace 1953

Comments on the workings information

  • MORE THAN 2 MILES OF UNDERGROUND WORKINGS AT MAIN SITE, AS WELL AS ADITS AND TRENCHES ON SEVERAL OF THE SMALLER BODIES

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit THERE ARE TWO TYPES OF SKARN RELATED DEPOSITS HERE. BOTH OCCUR ALONG THE CONTACT BETWEEN GRANODIORITE AND LIMESTONE. THE LIMESTONE IS OFTEN FRACTURED. THE FIRST DEPOSIT TYPE IS SULFIDE ORE WITH SOME GARNET-EPIDOTE GANGUE IN SEVERAL IRREGULAR BODIES. THE SECOND TYPE IS MASSIVE MAGNETITE BODIES (LENSES) WITH DISSEMINATED SULFIDES AND SOME GARNET-EPIDOTE GANGUE.
Deposit SULFIDE ORE BODIES AT JUMBO MINE HAVE BEEN MINED OUT. MAGNETITE BODIES HAVE ONLY BEEN EXPLORED. ORE BODIES AT COPPER MTN. 1 1/2 MI TO SE ARE SULFIDE TYPE AND HAVE BEEN MINED, AND IT IS UNKNOWN IF ORE REMAINS ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1984 Hirschmann, M. M. (Elliott, R. L.) U.S. Geological Survey

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.