Sumdum North Copper-Zinc Prospect

The Sumdum North Copper-Zinc Prospect is a zinc and copper mine located in Alaska at an elevation of 4,501 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Sumdum North Copper-Zinc Prospect
Secondary: Areas No. 1
Secondary: And 3

Commodity

Primary: Zinc
Primary: Copper
Tertiary: Lead
Tertiary: Silver
Tertiary: Gold

Location

State: Alaska
District: Petersburg

Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Cities Service Minerals Corp.
Home Office: P.O. Box 300, Tulsa, OK 74102
Years: 1974 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Discovery Year: 1958
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Form: LENS, TABULAR

Structure

Type: L
Description: Foliation Follows Folds, Strikes N 20 Degrees-45 Degrees W, Dips Steeply Ne. Faults Strike Nw

Alterations

Not available

Rocks

Not available

Analytical Data

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

Materials

Ore: Chalcopyrite
Ore: Malachite
Ore: Sphalerite
Ore: Gold
Ore: Galena
Ore: Chalcocite
Ore: Bornite
Gangue: Quartz
Gangue: Pyrrhotite
Gangue: Pyrite

Comments

Comment (Reserve-Resource): 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..

Comment (Reserve-Resource): INFERRED RESERVES OVER 9,000 FT. STRIKE LENGTH (ASSUMING DEPOSIT IS CONTINUOUS UNDER GLACIER BETWEEN AREAS NO. 3 AND 5), AVERAGE WIDTH OF 3

Comment (Location): 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).

Comment (Development): 62 LODE CLAIMS LOCATED IN 1958-1959. DIAMOND DRILLING AND SAMPLING CONDUCTED IN 1959. NO PRODUCTION.

Comment (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

Comment (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.

Comment (Workings): 14 DIAMOND DRILL HOLES TOTALLING 5,400 FT., AND 300 FT. OF OPEN CUTS.

Comment (Geology): 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.

References

Reference (Reserve-Resource): USGS B 1525, P. 185

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

Reference (Deposit): USGS B 1108-E (1964)

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

Reference (Deposit): USGS MF-425, LOC. 5 (1972)

Reference (Other Database): BAG-B-1525-FIG-68-4K199

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