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Sulphide Zinc-Lead-Silver Prospect

Prospect in Alaska, United States with commodities Zinc, Lead, Silver, Copper, 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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10002436
MRDS ID A013357
Record type Site
Current site name Sulphide Zinc-Lead-Silver Prospect
Related records 10258478

Geographic coordinates

Geographic coordinates: -133.26971, 57.61503 (WGS84)
Elevation 12
Relative position 8.9 MI. SE OF ROCK PT., ON W SHORE OF ENDICOTT ARM

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sumdum C-4 SW(quadrangle 1:24,000 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. 73, TRENCH NO. 1. LOCATION IS AT SITE OF HIGHEST COMBINED VALUES AT TRENCH NO. 1. TRENCH NOS. 2-5 EXTEND 800 FT. SE OF TRENCH NO. 1. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Sphalerite Ore
Feldspar Gangue
Marcasite Gangue
Pyrrhotite Gangue
Quartz Gangue

Alteration

  • (Local) Iron-Staining Of Gneiss

Analytical data

Result CHANNEL SAMPLE ASSAYS UP TO 1.9% ZN, 1.3% PB, 1.27 OZ/TON AG, 0.25% CU, 0.004 OZ/TON AU
Result HIGHEST COMBINED VALUE IN TRENCH NO. 1, SAMPLE 3P005: 1.75% ZN, 1.3% PB, 0.88 OZ/TON AG, 0.1% CU, TRACE AU. DATA FROM REF. 1, P. 192, 297, TABLE 32.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -133.26971, 57.61503
ListMap

Economic information

Ore body information

  • Strike FOLIATION: NW
    Dip FOLIATION: 67 DEGREES-75 DEGREES SW
    Thickness 0.12M
    Length 252.98M
    Width 4.57M

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1928

Workings at the site

  • Type of workings Surface
    Overall length 252.98M

Comments on the workings information

  • 5 OPEN CUTS OVER LENGTH OF 830 FT. ALONG NW STRIKE (TRENCHES NOS. 1-5)

Comments on development

  • STAKED IN 1928 AS 3 "IDAHO" CLAIMS, RESTAKED IN 1939 AS 40 PERCENT GROUP, TRENCHING DONE THEN, RELOCATED AS MAYBE GROUP IN 1955, SULPHIDE GROUP OF 16 CLAIMS 1969-70, 4 "ICEBERG" CLAIMS ACTIVE AS OF 1975.

Reference information

Bibliographic references

  • Deposit

    USGS B 1525, P. 190-92, 297, FIG. 73, TABLE 32, PLATE 1 (1984)

  • Other Database

    BAG-B-1525-FIG-73

General comments

Subject category Comment text
Deposit POORLY DEFINED BANDS OF DISSEMINATED AND MASSIVE SULFIDES UP TO 0.4 FT. THICK ROUGHLY PARALLEL FOLIATION OF RUSTY FELDSPATHIC GNEISS AND QUARTZITE. SPHALERITE, GALENA, CHALCOPYRITE, PYRRHOTITE, AND MARCASITE FOLLOW SELECTIVE HORIZONS IN MINOR FOLDS, AND ARE CONCENTRATED IN CREST OF SMALL FOLDS AND AS GRAINS AND STRINGERS PARALLEL TO FOLIATION. SULFIDES HAVE BEEN METAMORPHOSED. MINERALIZED ZONE RANGES FROM 5-15 FT. IN WIDTH, AND CRUDELY DEFINES SINGLE ZONE 830 FT. LONG.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1987 Niles, L.P. (Huber, D.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.