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Monarch

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

Geologic information

Identification information

Deposit ID 10308780
MRDS ID A010304
Record type Site
Current site name Monarch
Related records 10258389, 10000262

Geographic coordinates

Geographic coordinates: -130.05735, 56.00671 (WGS84)
Relative position The Monarch prospect, in Section 2 at an elevation of about 2350 feet, is on a west-facing mountainside about 0.6 mile east-northeast of the Riverside mine adit (Elliott and Koch, 1981, p. 19, loc. 79). The location is accurate within about 0.2 mile.

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
Lead Primary
Zinc Critical Primary
Tungsten Critical Secondary
Barium-Barite Critical Secondary

Materials information

Materials Type of material
Barite Ore
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Scheelite Ore
Sphalerite Ore
Tetrahedrite Ore
Quartz Gangue

Mineral occurrence model information

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

Nearby scientific data

(1) -130.05735, 56.00671
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the area of the Monarch prospect are the Triassic Texas Creek Granodiorite, which underlies and locally intrudes pelitic metasedimentary and subordinate andesitic (greenstone) metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group; 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). The deposit (Buddington, 1929, p. 74-75; Byers and Sainsbury, 1956, p. 139) consists of quartz-barite fissure veins in granodiorite that contain local shoots of galena, pyrite, tetrahedrite, sphalerite, and chalcopyrite, and sparse grains of scheelite. Samples of one vein assayed about 1-1.5 oz Au per ton, and a specimen of tetrahedrite reportedly contained 266 oz of Ag and about 1.0 oz of Au per ton. Barite is locally an abundant constituent of the veins. Byers and Sainsbury (1956, p. 139) report that a quartz veinlet four inches thick and exposed for most of the length of a 30-foot drift contains an estimated 0.5-3.0% WO3. The veinlet may be part of the Olympia Extension (BC078) vein that crops out 1000 feet to the southeast. Maas and others (1995, p. 254) suggest that the age of the Monarch deposit is Eocene, based on similarities in mineralogy, structural setting, and hostrock, to lead-isotope-dated Eocene deposits nearby in the Hyder district (see, for example, BC086). If so, the deposit is contemporaneous with emplacement of the Hyder Quartz Monzonite.
  • Age = Maas and others (1995, p. 254) suggest that the age of the Monarch deposit is Eocene, based on similarities in mineralogy, structural setting, and hostrock, to lead-isotope-dated Eocene deposits nearby in the Hyder district (see, for example, BC086). If so, the deposit is contemporaneous with emplacement of the Hyder Quartz Monzonite.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Hyder

Comments on the workings information

  • Workings / Exploration = The deposit was explored in the 1920's by opencuts, stripping, and a 30-foot adit. Early assays of samples of one vein showed about 1-1.5 oz Au per ton, and a specimen of tetrahedrite reportedly contained 266 oz of Ag and about 1.5 oz Au per ton. A quartz veinlet four inches thick and exposed for most of the length of a 30-foot drift contains an estimated 0.5-3.0% WO3 (Byers and Sainsbury, 1956).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Buddington, 1929

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.