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Atoll Prospect, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types
Atoll ProspectProspect
Yukon-Koyukuk Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
63° 25' 1'' North , 154° 22' 1'' West
Latitude & Longitude (decimal):
63.41694,-154.36694
GeoHash:
G#: be60z29qm
GRN:
N43W52
Type:
Prospect
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
196330
Long-form identifier:
mindat:1:2:196330:7
GUID (UUID V4):
0


See Reef Ridge (MD055), Midway (MD046), Beaver Creek (MD048),and other Mississippi Valley Type prospects in Medfra quadrangle. The Atoll prospect is on land selected or conveyed to Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.
Location: The Atoll prospect is situated at about 2,000 feet in elevation on the northwest slope of a ridge approximately 2.5 miles (4 km) northwest of Reef Ridge, in Section 11, T. 24 S., R. 23 E., of the Kateel River Meridian. Location is precisely known to within 100 feet (30 m).
Geology: At the Atoll prospect, smithsonite-bearing, iron-oxide gossan covers an area of 300 feet by 50 feet (91 m by 15 m) in tectonized dolomite and micritic limestone; unit probably equivalent to the Paradise Fork Formation of Dutro and Patton (1982). Mineralized rubble constitutes about one percent of float on the hillslope. Host unit is Late-Ordovician based on fossils (Dutro and Patton, 1982). Age of mineralization is not known. A large composite, chip-channel sample of 50 samples taken across the mineralized zone averaged 1.0 percent zinc and 395 ppm lead. A high-graded sample of 10 pieces of mineralized float contained 7.95 percent zinc but no lead. A strong zinc soil anomaly (1,900 to 4,000 ppm) covers a 1,000 feet by 4,000 feet (300 m by 122 m) area below the Atoll prospect (Andrews and Rishel, 1982).
Workings: The Atoll prospect was discovered by WGM Inc. and Patino Ltd. during exploration for base metals in the late 1970s on lands selected by Doyon Ltd. (Andrews and Rishel, 1982). A large composite, chip-channel sample of 50 samples taken across the mineralized zone averaged 1.0 percent zinc and 395 ppm lead. A high-graded sample of 10 pieces of mineralized float yielded 7.95 percent zinc but no lead. A strong zinc soil anomaly (1,900 to 4,000 ppm) covers a 1,000 feet by 4,00 feet (300 m by 122 m) area below the Atoll prospect.
Age: Host unit is Late-Ordovician based on fossils (Dutro and Patton, 1982). Age of mineralization is not known.
Alteration: Secondary dolomite.
Reserves: None.

Commodities (Major) - Zn; (Minor) - Pb
Development Status: No
Deposit Model: Southeast Missouri Pb-Zn, (Cox and Singer, 1986; model no. 32a)

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


2 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 5 - Nitrates and Carbonates
ⓘSmithsonite5.AB.05ZnCO3
ⓘDolomite5.AB.10CaMg(CO3)2

List of minerals for each chemical element

CCarbon
Cⓘ DolomiteCaMg(CO3)2
Cⓘ SmithsoniteZnCO3
OOxygen
Oⓘ DolomiteCaMg(CO3)2
Oⓘ SmithsoniteZnCO3
MgMagnesium
Mgⓘ DolomiteCaMg(CO3)2
CaCalcium
Caⓘ DolomiteCaMg(CO3)2
ZnZinc
Znⓘ SmithsoniteZnCO3

Other Databases

Link to USGS - Alaska:MD053

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

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References

Andrews, Tom, and Rishel, John, 1982, Annual Report for 1981, Reef Ridge I-to-XIII Project Areas, Kuskokwim Block, Alaska: Anchorage, Alaska, WGM Inc., Project Report 4, 45 p., 2 sheets, scales 1:63,360 and 1:20,000. (Report held by Doyon, Limited, Fairbanks, Alaska.) Dutro, J.T. Jr., and Patton,W.W. Jr., 1982, New Paleozoic formations in the northern Kuskokwim Mountains, west-central Alaska: U.S. Geological Survey Bulletin 1529-H, p. H13-H22. Patton, W.W. Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811, one sheet at 1:250,000 scale. Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.
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