88 Group

Occurrence in Alaska, United States with commodity Gold

Geologic information

Identification information

Deposit ID 10003672
MRDS ID A106443
Record type Site
Current site name 88 Group

Geographic coordinates

Geographic coordinates: -144.76486, 65.43252 (WGS84)
Relative position SEE LOCATION COMMENTS
(click for info)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • THE 88 GROUP CLAIMS CAN BE REACHED VIA AN 8 MILE LONG DIRT ROAD THAT STARTS IN CIRCLE HOT SPRINGS. THE CLAIMS ARE ON THE PORTAGE CREEK SIDE OF THE DIVIDE ALONG PORTAGE CREEK ROAD.

Commodities

Commodity Importance
Gold Primary

Nearby scientific data

(1) -144.76486, 65.43252

Ore body information

  • General form SEE DEPOSIT DESCRIPTION COMMENTS

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Comments on exploration

  • Status = Inactive

Mining district

District name Circle

Comments on the workings information

  • EXPLORATION WAS RESTRICTED TO SURFACE SAMPLING.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106443
USGS Alaska Resource Data File ARDF CI001

Bibliographic references

  • Deposit

    Bakke, 1991, Fairbanks gold in Vetter, 1995, Joker and 88 group property summary: 24 p.

  • Deposit

    Vetter, R., 1995, Joker and 88 group property summary: Vetter and Associates, 24 p.

  • Deposit

    Wiltse, M. A., Reger, R. D., Newberry, R. J, Pessel, G. H., Pinney, D. S., Robinson, M. S., and Solie, D. N., 1995, Bedrock geologic map of the Circle mining district, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 95-2b, 1 sheet, scale 1:63,360.

General comments

Subject category Comment text
Deposit THE 88 GROUP OCCURRENCE APPEARS TO BE A DARK MAFIC INTRUSIVE PHASE CONTACT WITH A COARSE PORPHYRITIC GRANITE. BOTH LODE AND PLACER GOLD IS FOUND AT THESE CLAIMS (VETTER, 1995). WILTSE AND OTHERS (1995) MAPPED THE BEDROCK IN THE AREA AND DESCRIBED THE CRETACEOUS GRANITE AS A CHLORITIZED PORPHYRITIC (HORNBLENDE) BIOTITE MONZOGRANITE TO SYENOGRANITE. THEY ALSO MAPPED A MAFIC DIKE IN THE AREA OF THE 88 GROUP CLAIMS WHICH IS DESCRIBED AS BLACK TO DARK GRAY, APHANITIC TO SLIGHTLY PORPHYRITIC WITH MAJOR PLAGIOCLASE, AUGITE, HORNBLENDE AND MAGNETITE. GOLD MINERALIZATION OCCURS WITHIN HEAVILY FE-OXIDE STAINED, QUARTZ-FILLED GREISEN ZONES (UP TO SIX FEET ACROSS), WITHIN FRACTURES, AND IN STOCKWORK VEINING. A SIGNIFICANT ASPECT OF THE PROSPECT IS THE LARGE AMOUNT OF GRUS DEVELOPMENT, 10 TO 20 FEET, THAT PANS CONSIDERABLE GOLD. OTHER HEAVY MINERALS CONCENTRATED IN THE PANS INCLUDE ABUNDANT SPHALERITE, AND SMALL AMOUNTS OF ARSENOPYRITE, CHALCOPYRITE, CASSITERITE (?), AND MONAZITE (?).
Deposit CONTINUOUS GOLD ANOMALIES OCCUR IN THE VICINITY OF THE 88 GROUP DISCOVERY OUTCROP ALONG APPROXIMATELY 2000 FEET OF DITCH EXPOSURE ALONG THE PORTAGE CREEK ROAD. THE MINERALIZATION OCCURS WITHIN HEAVILY FE-OXIDE STAINED, QUARTZ-FILLED GREISEN ZONES OF VARIABLE WIDTH (3 INCH AVERAGE). PHYLLIC AND ARGILLIC ALTERATION IS PRESENT ALONG VEIN MARGINS AND IS ALSO CONTROLLLED BY FRACTURES. STRONG ZINC ANOMALIES (UP TO 0.5 PERCENT) AND MODERATE ARSENIC VALUES ARE PRESENT. TIN WAS NOT DETECTED IN THE ROCK SAMPLES, HOWEVER, TWO PAN CONCENTRATES CONTAIN ANOMALOUS VALUES. THE DOMINANT TREND IN MINERALIZATION IS N 50 W WITH NEAR VERTICAL DIPS (BAKKE,1991).

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1998 C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements Avalon Development Corporation