88 Group

Occurrence in Alaska, United States with commodity Gold

Sections on this page

Identification information
Geographic coordinates
Site location context
Geographic areas
Commodities
Nearby scientific data
Ore body information
Economic information about the deposit and operations
Mining district
Links to other databases
Bibliographic references
General comments
Reporter information

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

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Circle B-2(quadrangle 1:63,360 scale)

Circle SE(quadrangle 1:100,000 scale)

Circle(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

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	ListMap

Economic information

Ore body information

General form SEE DEPOSIT DESCRIPTION COMMENTS

General form	SEE DEPOSIT DESCRIPTION COMMENTS

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).

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

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.