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Spring Ridge Prospects, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types
Spring Ridge ProspectsGroup of Prospects
Yukon-Koyukuk Census AreaCensus Area
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
63° 27' 57'' North , 154° 7' 48'' West
Latitude & Longitude (decimal):
63.46583,-154.13000
GeoHash:
G#: be63h9tgq
GRN:
N43W52
Type:
Group of Prospects
Köppen climate type:
Dfc : Subarctic climate
Mindat Locality ID:
200111
Long-form identifier:
mindat:1:2:200111:4
GUID (UUID V4):
0


See Starship (MD043), Bermuda (MD045), and Bear Pass (MD044) Mississippi Valley Type occurrences in Medfra quadrangle. The Spring Ridge prospects are on land selected or conveyed to Doyon Ltd. For further infoemation, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.
Location: The Spring Ridge prospects consists of two areas of mineralization about 1,000 feet apart on northwest spurs at 1,900 feet in elevation (580 m) in Section 25, T. 23 S., R. 23 E., of the Kateel River Meridian. Location is accurate within 1,000 feet (304 m).
Geology: At the Spring Ridge prospects, smithsonite-bearing gossans occur on two adjacent ridge spurs about 1,000 feet (300 m) apart, and about 30 feet by 50 feet (9 m by 15 m) in size, in the lower part of the Whirlwind Creek Formation of Dutro and Patton (1982); this is unit 'Dda' of Andrews and Rishel (1982). Mineralization in both areas occur in well developed solution breccias in dolomite. Host rock is inferred to be Latest Silurian based on fossils; however, the age of the mineralization is unknown. A grab sample from surface exploration along the eastern spur yielded 2.72 percent zinc and 0.14 percent lead. Two grab samples from the western spur contained 9.07 percent zinc and 12.00 percent zinc respectively; no lead was detected in either sample (Andrews and Rishel, 1982).
Workings: The Spring Ridge prospects were found by WGM Inc. and Patino Ltd. during base metal exploration conducted in the 1970s on lands selected by Doyon Ltd. (Andrews and Rishel, 1982). A grab sample from surface exploration along the eastern spur yielded 2.72 percent zinc and 0.14 percent lead. Two grab samples from the western spur contained 9.07 percent zinc and 12.00 percent zinc respectively; no lead was detected in either sample.
Age: Host rock is inferred to be Latest Silurian based on fossils (Dutro and Patton, 1982); however, the age of the mineralization is unknown.
Alteration: Secondary dolomite in fractures.
Reserves: None.

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

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:MD047

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

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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