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Iron No. 1-4

Prospect in Alaska, United States with commodities Silver, Gold, Copper
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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. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10308521
Record type Site
Current site name Iron No. 1-4
Alternate or previous names Shaft Creek Copper

Geographic coordinates

Geographic coordinates: -130.03975, 56.00577 (WGS84)
Relative position This site consists of a 0.6-mile-long, north-northeast-trending line of prospects in Section 1 between elevations 2600-3250 feet on the divide between Skookum and Fish Creeks (Maas and others, 1995, p. 252 and fig. 66). The above coordinates are for the approximate center of this line of prospects, all of which are within a half-mile of the map location.

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

Bradfield Canal A-1(quadrangle 1:63,360 scale)

Bradfield Canal SE(quadrangle 1:100,000 scale)

Bradfield Canal(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

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
Silver Primary
Gold Primary
Copper Primary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Galena Ore
Pyrrhotite Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • Volcanic (greenstone) hostrocks are impregnated with sulfide minerals.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -130.03975, 56.00577
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the general area of this site are pelitic metasedimentary and subordinate andesitic metavolcanic (greenstone) strata of the Jurassic or older Mesozoic Hazelton Group; the Triassic Texas Creek Granodiorite, which underlies and locally intrudes the Hazelton; the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks; and still-younger Tertiary lamprophyre dikes, which cut all the other rocks (Smith 1973, 1977; Koch, 1996). Maas and others (1995, p. 252, 260) describe the deposits as veins, disseminations, and masses of gold-bearing pyrrhotite with associated chalcopyrite and arsenopyrite, and local sphalerite and galena. Individual mineralized zones range from about 60-450 feet wide and are located near or in shears in Hazelton volcanic rocks (greenstone). The prospects roughly align with the contact between Hazelton volcanics and Texas Creek Granodiorite, and are never more than about 1300 feet in lateral distance from the surface exposure of that contact. Maas and others (p. 252) suggest that the age of the deposits is Jurassic, based on similarities in mineralogy, structural setting, and hostrock, with isotopically-dated Jurassic deposits nearby in the Hyder district (for example, see BC065, 067), and at the Scottie gold mine nearby in British Columbia (Alldrick, 1993). If so, the deposits are contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).
  • Age = Maas and others (1995, p. 252) suggest that the age of the deposits is Jurassic, based on similarities in mineralogy, structural setting, and hostrock, with isotopically-dated Jurassic deposits nearby in the Hyder district (for example, see BC065, 067), and at the Scottie gold mine nearby in British Columbia (Alldrick, 1993). If so, the deposits are contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Hyder

Comments on the production information

  • Production Notes = Small amount of ore stored at Shaft Creek Copper prospect.

Comments on the workings information

  • Workings / Exploration = The prospects have been explored by small pits and trenches; there is a flooded shaft on Shaft Creek Copper prospect. Various samples of the deposits collected by the U. S. Bureau of Mines in 1992 or 1993 (Maas and others, 1995. p. 260) contain up to 14.74 ppm Au (Iron No. 2), 64.11 ppm Ag (Iron No. 4), 17.3% Cu (Shaft Creek Copper), 6370 ppm Pb (Iron No. 4), and 6840 ppm Zn (Iron No. 4).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Maas and others, 1995

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins

Reporter information

Type Date Name Affiliation Comment
Reporter 17-MAY-1998 H. C. Berg 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.