Ole Creek

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities As; Ba; Bi; Pb; Sb; W; Zn
Ore minerals arsenopyrite; gold; pyrite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale D-4
Latitude 64.762
Longitude -142.5685
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Ole Creek prospect is in a saddle on the ridgeline between the headwaters of the west fork of Ole Creek and Granite Creek. The coordinates are the approximate center of the Ole Creek prospect ,at about the center of the boundary between sections 5 and 8, T. 2 S., R. 26 E., of the Fairbanks Meridian; the location is accurate. The Ole Creek prospect is located within Doyon, Ltd. selected or conveyed land.

Geologic setting

Geologic description

The Ole Creek prospect is in a quartz monzonite, granodiorite, and quartz syenite pluton (DiMarchi, 1993). Seven miles to the north, biotite from a similar granite on upper Granite Creek (see EA005) gives a 40Ar/39Ar plateau age of 93.3 +/- 0.5 Ma (Newberry and others, 1996). At the Ole Creek prospect, plutonic rocks in a saddle on the ridgeline between Granite Creek and Ole Creek exhibit chlorite, sericite, and calcite alteration. Limited prospecting and sampling has defined a zone more than 200 feet wide that is cut by east-northeast-trending quartz veins. There are numerous sulfide-bearing veins, which vary from thin stockwork stringers to massive quartz-calcite veins. Strong zones of alteration and quartz veining are associated with several generations of faulting (WGM Inc., 1998 [DLR 98-19]). Quartz veining is locally associated with secondary potassium feldspar and chlorite.
Stibnite, pyrite, and arsenopyrite occur in drusy quartz veins across a northeasterly trending zone 5 to 40 feet wide (DiMarchi, 1993). Numerous similar zones are present in the area. A 10- by 50-foot zone in the saddle contains iron- and arsenic-oxide stained quartz vein rubble with 0.5 percent disseminated pyrite and 1 to 2 percent disseminated arsenopyrite. Vein samples contain as much as 935 ppb gold, 53.6 ppm silver, greater than 10,000 ppm arsenic, and 1,095 ppm antimony. The veins shows multiple episodes of quartz deposition and contain gray bands of very fine grained sulfides and coarser grained pyrite and arsenopyrite. Altered quartz monzonite is anomalous in barium (250 ppm), tungsten (230 ppm), and zinc (430 ppm). Altered granodiorite contains 885 ppb gold, 30 ppm silver, 9,610 ppm lead, greater than 10,000 ppm arsenic, 16 ppm bismuth, and 1,075 ppm zinc. A yellow-gray massive quartz vein contains 335 ppb gold, 20 ppm silver, 646 ppm lead, 3,810 ppm arsenic, and 5.2 ppm bismuth (DiMarchi, 1993).
Stream sediment and panned heavy-mineral concentrate samples from the Ole Creek drainage contain as much as 410 ppm lead and 500 ppm zinc (DiMarchi, 1993). An iron-stained quartz vein without visible sulfides found in stream float contains 40 ppb gold, 20.2 ppm silver, 2,220 ppm lead, 5,460 ppm arsenic, 56 ppm bismuth, and 16 ppm molybdenum.
During reconnaissance field work in 1975, WGM Inc. identified tungsten and lead-zinc stream-sediment and heavy-mineral-concentrate anomalies in the Ole Creek drainage (WGM Inc., 1998 [DLR 98-19]). The area was revisited in 1977, and additional geochemically anomalous samples were collected. In 1993, ASA Inc. prospected and collected stream-sediment and heavy-mineral concentrate samples in the Ole Creek drainage to verify these anomalies, and to identify potential lode sources (DiMarchi, 1993). WGM Inc. conducted a short traverse on the ridge between Ole and Granite Creeks in 1996, and collected follow-up samples in the saddle area between Ole and Granite Creeks in 1997 (WGM Inc., 1998 [DLR 98-19]).
Geologic map unit (-142.570824979028, 64.7616623650663)
Mineral deposit model Possibly Comstock epithermal veins (Cox and Singer, 1986; model 25c?).
Mineral deposit model number 25c?
Age of mineralization Cretaceous or younger, on the basis of the age of host rocks.
Alteration of deposit At the Ole Creek prospect, plutonic rocks exhibit chlorite, sericite, and calcite alteration. Quartz veining is locally associated with secondary potassium feldspar and chlorite.

Production and reserves

Workings or exploration During reconnaissance field work in 1975, WGM Inc. identified tungsten and lead-zinc stream-sediment and heavy-mineral-concentrate anomalies in the Ole Creek drainage (WGM Inc., 1998 [DLR 98-19]). The area was revisited in 1977, and additional geochemically anomalous samples were collected. In 1993, ASA Inc. prospected and collected stream-sediment and heavy-mineral concentrate samples in the Ole Creek drainage to verify these anomalies and to identify potential lode sources (DiMarchi, 1993). WGM Inc. conducted a short traverse on the ridge between Ole and Granite Creeks in 1996 and collected follow-up samples in the saddle area between Ole and Granite Creeks in 1997 (WGM Inc., 1998 [DLR 98-19]).
Indication of production None

Additional comments

The Ole Creek prospect is located within Doyon, Ltd. selected or conveyed land. For more information contact Doyon, Ltd., Fairbanks, Alaska.

References

References

Dashevsky, S.S., and Nicol, D.L., 1985, Geologic field examinations in Doyon, Ltd. Regional Selection Blocks 1,6, 8, 9, 10, 12, 13, 18, 19, 20, 21, and Hughs and MTNT Village Lands, 1984: Doyon, Ltd. Report 85-07. (Report held by Doyon, Ltd., Fairbanks, Alaska).
Dashevsky, S.S., Nicol, D.L., and Bond, J., 1986, Mines, prospects, and geochemical anomalies on Doyon Limited regional overselection lands, Alaska, Blocks 1-8: Doyon, Ltd. Report 86-01a, 300 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).
DiMarchi, J.J., 1993, 1992 annual report, reconnaissance program, Doyon option lands, v. 1, ASA Inc. report, Doyon, Ltd. Reports 93-168A and 93-44A. (Reports held by Doyon, Ltd., Fairbanks, Alaska).
Rogers, Bob, and Bradley, Laura, 1998, Gold deposits of the Seventymile Belt: Extended Abstracts of the 16th Biennial Conference on Alaskan Mining, Second Rush of 98; Alaska Miners Association meeting March 2-7, 1998, Fairbanks, Alaska, p. 22.
WGM Inc., 1977, Doyon Project, 1976 annual progress report, volume 1a, Blocks 1, 4, 5, 7, 8: Doyon, Ltd. Report 77-02a. (Report held by Doyon, Ltd., Fairbanks, Alaska).
WGM Inc., 1998, Ventures Resource Alaska projects, 1997 progress report, Seventymile property exploration, volume 1: Doyon, Ltd. Report 98-19. (Report held by Doyon, Ltd., Fairbanks, Alaska).
Reporters M.B. Werdon; R.L. Flynn
Last report date 5/1/2002