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Cap

Prospect in Alaska, United States with commodities Silver, Gold, Barium-Barite, Lead, Zinc, Antimony
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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. Host and associated rocks
  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 10002192
MRDS ID A013090
Record type Site
Current site name Cap
Related records 10136611

Geographic coordinates

Geographic coordinates: -136.42214, 59.37974 (WGS84)
Relative position This prospect is at the northern edge of Saksaia Glacier at an elevation of about 3,800 feet and approximately 2.1 miles due east of Mt. Henry Clay. It is shown in Figure 7 of Still (1984 [OF 118-84]).

Site location context

Political divisions (FIPS codes)

Haines(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Skagway B-4(quadrangle 1:63,360 scale)

Skagway SE(quadrangle 1:100,000 scale)

Skagway C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chilkat-Skagway Rivers(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Barium-Barite Critical Primary
Lead Primary
Zinc Critical Primary
Antimony Critical Secondary

Materials information

Materials Type of material
Barite Ore
Galena Ore
Pyrite Ore
Sphalerite Ore
Tetrahedrite Ore

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93
Model code 91
USGS model code 24b
Deposit model name Massive sulfide, Besshi (Japanese deposits)
Mark3 model number 30

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Schist > Greenschist
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Metamorphic Rock > Schist > Greenschist

Nearby scientific data

(1) g
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This prospect consists of barite-rich sulfide lenses up to 8 feet thick in a 50-foot-thick, 220-foot-long, iron-stained zone capped by volcanics that outcrop above the Saksaia glacier. The full extent of the prospect is hidden by glacier and cover. Pyrite, sphalerite, galena and tetrahedrite are found in the barite lenses. Samples contained up to 50% barium, 1.1% zinc, 0.33% lead, 277.7 ppm silver, 1.371 ppm gold, and 100 ppm cobalt. (Still, 1984 [OF 118-84], and Still and others, 1991). The mineralization is near a cupola of Cretaceous quartz diorite. It is mineralogically similar to the other barite-rich deposits lodes in the area such as the Main Zone/Palmer (SK066) and Nunatak (SK058) prospects (MacKevett and others, 1974).? Rubicon Minerals (1998) cites the results of work by Newmont Gold Company that includes a 43-foot channel sample that contained 247.6 ppm silver, 0.263 ppm gold, 2,753 ppm zinc, 1,803 ppm lead, and 174 ppm copper as well as a drill hole with a 76.3-foot-thick intercept that averaged 3.7 ounces of silver per ton. This prospect lies along a northwesterly mineral trend that includes the Nunatak (SK058), Cap, and Mt. Henry Clay (SK068) prospects. Rubicon Minerals considers these prospects to all occur at the same mineralized stratigraphic horizon and attributes their distribution to a northwest-trending, shallowly plunging antiform that brings the massive-sulfide horizon close to the surface (Rubicon Minerals, 1998). The Cap prospect and other similar prospects in the Mt. Henry Clay area are probably correlative with the Windy Craggy deposit in Canada and the Greens Creek deposit on Admiralty Island and are therefore Late Triassic (Still, 1984 [OF 118-84]; Newberry and others, 1997).
  • Age = The Cap prospect and other similar prospects in the Mt. Henry Clay area are probably correlative with the Windy Craggy deposit in Canada and the Greens Creek deposit on Admiralty Island and are therefore Late Triassic (Still, 1984 [OF 118-84]; Newberry and others, 1997).

Economic information about the deposit and operations

Development status Prospect
Commodity type Both

Comments on exploration

  • Status = Active

Mining district

District name Juneau (Skagway subdistrict)

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Still, 1984 (OF 118-84)

General comments

Subject category Comment text
Deposit Model Name = Probably a Kuroko- or Besshi-type volcanogenic massive sulfide (Cox and Singer, 1986; models 28a or 24b).

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-2001 T.C. Crafford T. Crafford & Associates

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.