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Crystal

Prospect in Alaska, United States
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Nearby scientific data
  6. Economic information about the deposit and operations
  7. Mining district
  8. Links to other databases
  9. Bibliographic references
  10. Reporter information

Geologic information

Identification information

Deposit ID 10307645
Record type Site
Current site name Crystal

Geographic coordinates

Geographic coordinates: -131.64378, 55.52874 (WGS84)
Relative position This prospect is known only from U.S. Bureau of Mines (1977) claim records. Its approximate location is at an elevation of less than 100 feet, in or near the valley of an unnamed, north-northwest-flowing creek that empties into the tidal mud flat at the head of Moser Bay. The site is in section 19, T. 73 S., R. 91 E., of the Copper River Meridian. It corresponds to loc. 45 in Elliott and others (1978). The location is accurate within 0.2 mile.

Site location context

Political divisions (FIPS codes)

Ketchikan Gateway(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan C-5(quadrangle 1:63,360 scale)

Ketchikan NW(quadrangle 1:100,000 scale)

Ketchikan(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Ketchikan(hydrologic unit)

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

Nearby scientific data

(1) -131.64378, 55.52874
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks near this prospect consist mainly of flyschlike metasedimentary rocks, and subordinate andesitic and basaltic metavolcanic rocks that are intruded by Cretaceous stocks, sills, and dikes of feldspar-porphyritic granodiorite (Berg and others, 1988). There also are scattered, small, fault-bounded outcrops of Cretaceous ultramafic rocks. The strata were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time, and, near some of the granodiorite contacts, subsequently contact metamorphosed to hornblende hornfels (Brew, 1996, p. 27; Berg and others, 1988, p. 17). The premetamorphic age range of the strata is unknown. Berg and others (1988, p. 17) note that they closely resemble Upper Jurassic to mid-Cretaceous marine flysch and volcanic rocks nearby on Gravina Island. The prospect appears to be in metapelite that probably is intruded by granodiorite sills or dikes. No other information about it has been made public.

Economic information about the deposit and operations

Development status Prospect

Mining district

District name Ketchikan

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Elliott and others, 1978; Berg and others, 1988

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-99 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.