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Sumdum North Copper-Zinc Prospect

Prospect in Alaska, United States with commodities Copper, Zinc, Lead, Silver, Gold
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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. Geologic structures
  10. Ore body information
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Ownership information
  16. Reserves and resources
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10002411
MRDS ID A013330
Record type Site
Current site name Sumdum North Copper-Zinc Prospect
Alternate or previous names Areas No. 1, And 3

Geographic coordinates

Geographic coordinates: -133.45917, 57.79197 (WGS84)
Elevation 1372
Relative position 1.3 MI. SW OF MT. SUMDUM

Site location context

Political divisions (FIPS codes)

Hoonah-Angoon(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sumdum D-5(quadrangle 1:63,360 scale)

Sumdum N(quadrangle 1:100,000 scale)

Sumdum(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central 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)

Tracy Arm-Fords Terror Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS B 1525, FIG. 68, SAMPLE NO. 4K199; USGS MF-425, LOC. 5. LOCATION IS IN AREA NO. 3; AREAS 1, 2, 3 ARE NORTH OF SUMDUM GLACIER, MAY BE CONTINUOUS WITH AREAS 4 AND 5 TO THE SOUTH OF THE GLACIER. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Copper Primary
Zinc Critical Primary
Lead Tertiary
Silver Tertiary
Gold Tertiary

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Galena Ore
Gold Ore
Malachite Ore
Sphalerite Ore
Pyrite Gangue
Pyrrhotite Gangue
Quartz Gangue

Analytical data

Result UP TO 1.2% CU, 6.5% ZN, 0.24% PB, 15 PPM AG, 1.5 PPM AU-USGS B 1525, TABLE 29, AREA

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Hornblendite
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -133.45917, 57.79197
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Foliation Follows Folds, Strikes N 20 Degrees-45 Degrees W, Dips Steeply Ne. Faults Strike Nw

Ore body information

  • General form LENS, TABULAR
    Strike N 25 DEGREES-50 DEGREES W
    Dip N 65 DEGREES E-VERTICAL
    Plunge 10 DEGREES-40 DEGREES
    Plunge direction SE
    Thickness 304.8M
    Length 3048M
    Width 15.24M

Controls for ore emplacement

  • Localized Along Crest Of Anticline And Parallel Folds, Follow Brecciated Fault Zones

Comments on the geologic information

  • LARGE ISOCLINAL ANTICLINE HAS SMALLER DRAG FOLDS ON LIMBS; SMALLER FOLDS OVERTURNED TO SW. BOUNDED BY HORNBLENDE SCHIST AND AMPHIBOLITE ON WEST, FOLIATED TONALITE ON EAST.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1958
Discoverer Alaska Helicopter Syndicate

Mining district

District name Petersburg

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Cities Service Minerals Corp.
    Home office P.O. Box 300, Tulsa, OK 74102
    First year 1974

Reserves and resources

  • Type In-situ
    Estimate year 1984
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.57 wt-pct Copper Major 1984
    Zinc Zn 0.37 wt-pct Zinc Major 1984
    Silver Ag 0.3 g/mt Silver Trace 1984

Comments on the reserve resource information

  • DRILL-INDICATED RESERVES OVER 1,500 FT. STRIKE LENGTH IN AREAS NO. 3 AND 5, WITH AVERAGE WIDTH OF 31.5 FT AND DOWN-DIP THICKNESS OF 1,000 FT..
  • INFERRED RESERVES OVER 9,000 FT. STRIKE LENGTH (ASSUMING DEPOSIT IS CONTINUOUS UNDER GLACIER BETWEEN AREAS NO. 3 AND 5), AVERAGE WIDTH OF 3

Comments on the workings information

  • 14 DIAMOND DRILL HOLES TOTALLING 5,400 FT., AND 300 FT. OF OPEN CUTS.

Comments on development

  • 62 LODE CLAIMS LOCATED IN 1958-1959. DIAMOND DRILLING AND SAMPLING CONDUCTED IN 1959. NO PRODUCTION.

Reference information

Bibliographic references

  • Deposit

    USGS B 1525, P. 180-85, FIG. 68, TABLE 29 (1984)

  • Deposit

    USGS B 1108-E (1964)

  • Deposit

    USGS OF 78-698, P. 28-29 (1978)

  • Deposit

    USGS MF-425, LOC. 5 (1972)

  • Other Database

    BAG-B-1525-FIG-68-4K199

  • Reserve-Resource

    USGS B 1525, P. 185

General comments

Subject category Comment text
Deposit MINERALIZED ZONES 1-50 FT. WIDE ALONG, CREST AND FLANKS OF LARGE NW-STRIKING, GENTLY SE PLUNGING, ISOCLINAL, ANTICLINAL FOLD IN INTERLAYERED BIOTITE-QUARTZ-PLAGIOCLASE AND HORNBLENDE-PLAGIOCLASE GNEISS. POTENTIAL ORE BODIES ON MINOR FOLDS ON LARGER FOLD LIMBS, PARALLET TO AXIS OF LARGE ANTICLINE. DISSEMINATED AND LOCALLY MASSIVE PYRRHOTITE AND PYRITE BODIES CONTAINING CHALCOPYRITE AND SPHALERITE WITH SMALL AMOUNTS OF BORNITE, CHALCOCITE, MALACHITE, AZURITE, AND GALENA ARE PARALLEL TO FOLIATION OF GNEISS, STRIKING N 25 DEGREES-50 DEGREES W. QUARTZ IS THE DOMINANT GANGUE MINERAL, AND FORMS VEINS AND LENSES. MASSIVE SULFIDE BODIES ARE UP TO 50 FT. LONG AND 15 FT. THICK. IF MINERALIZATION BETWEEN AREA 3 NORTH OF SUMDUM GLACIER AND AREAS 4 AND 5 SOUTH OF THE GLACIER IS CONTINUOUS, THE DEPOSIT WOULD HAVE A STRIKE LENGTH OF 10,000 FT., WITH 1,000 FT. OF DOWN-DIP MINERALIZATION EXPOSED. SOME ORE ZONES FOLLOW BRECCIATED FAULT ZONES.
Deposit DRILL DATA INDICATES THAT MINERALIZATION IS PROBABLY CONTINOUS UNDER SUMDUM GLACIER BETWEEN NORTHERN DEPOSIT (SD-13) AND SOUTHERN DEPOSIT (SD-14). ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1987 Leonard, Kenneth R. (Huber, Donald F.) U.S. Geological Survey
Editor 14-SEP-1994 Waller, Nichelle (Mosier, Dan) U.S. Geological Survey PARSED OUT HOST ROCK AND ASSOCIATED ROCK TYPES, AGES, UNIT NAMES, AND UNIT AGES.

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.