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East Scrafford

Prospect in Alaska, United States with commodity 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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. Reporter information

Geologic information

Identification information

Deposit ID 10307445
Record type Site
Current site name East Scrafford

Geographic coordinates

Geographic coordinates: -147.74896, 64.99968 (WGS84)
Relative position The East Scrafford prospect is about 1,900 feet east of the Scrafford mine (FB077); it is located just north of Old Murphy Dome Road in the NE1/4 SE1/4 sec. 16, T. 2 N., R. 1 W., Fairbanks Meridian.

Site location context

Political divisions (FIPS codes)

Fairbanks North Star(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fairbanks D-2(quadrangle 1:63,360 scale)

Big Delta NW(quadrangle 1:100,000 scale)

Fairbanks(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Alteration

  • (Local) The intrusive at the surface is moderately to strongly silicified, locally bleached, and iron stained. The schist country rock is strongly silicified at the intrusive contact. Downhole, the sill is cut by sparse hairline quartz veinlets. In the shear zone, intrusive fragments are highly silicified and locally altered to clay (Dashevsky, 1993).

Nearby scientific data

(1) PzPxyqs
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The following geologic description is summarized from a report by Sam Dashevsky (1993) on work done by American Copper and Nickel Company on the Eagle Creek property in the early 1990's. In the shallow subsurface at this prospect, a 30-foot-thick, medium-grained, equigranular granite and quartz porphyry sill intrudes quarz-mica schist and micaceous quartzite. The intrusion is truncated by a major fault, believed to be the eastern extension of the Scrafford shear zone (see FB077). The Scrafford shear trends N. 80-85 E. and dips 55-60 S. (Robinson and Bundtzen,1982). The upper intrusive contact is irregular and sub-horizontal and lies under 10 feet of schist and 4 feet of loess. At the surface, chip samples across the 30-foot exposure of the intrusion, are enriched in gold and arsenic; the samples average 0.024 ounce of gold per ton and 2,060 to 6,490 ppm arsenic. No significant antimony values are reported. Schist in the wallrock is weakly to unmineralized. The Scrafford shear contains as much as 350 ppb gold, 2,480 ppm arsenic, and 102 ppm antimony. Drilling indicated that the quartz porphyry sill does not exceed 210 ppb gold. The deeper intersection of the sill and the shear, which is composed largely of intrusive and quartz clasts in gouge, averages 0.029 ounce of gold per ton over 35 feet and 0.1 to 1.0 percent arsenic. The intrusive at the surface is moderately to strongly silicified, locally bleached, and iron stained. The schist country rock is strongly silicified at the intrusive contact. Downhole, the sill is cut by sparse, hairine quartz veinlets. In the shear zone, intrusive fragments are highly silicified and locally altered to clay.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Fairbanks

Comments on the workings information

  • Workings / Exploration = In the 1970's, Cantu Minerals Association trenched at the East Scrafford site in pursuit of the eastern extension of the Scrafford shear (FB077). In 1991-93, American Copper and Nickel Company mapped the trench exposure, took soil samples, and drilled two reverse-circulation holes (Dashevsky, 1993). The gold assays of samples did not encourage them to continue.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Dashevsky, 1993

Reporter information

Type Date Name Affiliation Comment
Reporter 31-JUL-01 J.R. Guidetti Schaefer and C.J. Freeman Avalon Development Corporation

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.