Makushin Volcano Sulfur Prospect, Aleutian Islands Mining District, Aleutians West Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Makushin Volcano Sulfur Prospect | Prospect |
| Aleutian Islands Mining District | Mining District |
| Aleutians West Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
53° 53' 14'' North , 166° 55' 37'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Dutch Harbor | 4,376 (2018) | 25.2km |
| Unalaska | 4,491 (2017) | 25.6km |
Mindat Locality ID:
198719
Long-form identifier:
mindat:1:2:198719:8
GUID (UUID V4):
756b7dd3-73c2-41d1-90e2-3420df863a58
Extensive evaluation and drilling by State of Alaska for geothermal evaluation conducted in 1970's and 1980's (Motyka, 1983; Motyka and others, 1983; 1988; Nye and others, 1984; Queen, 1989; Reeder, 1982, AOF 163; 1982 in Watson; Republic Geothermal, Inc, 1983; 1984; 1985). Russian sulphur production prior to 1840.
Location: Location is in crater at summit of Makushin Volcano (Maddren, 1919, p. 285, fig. 3). Coordinates were derived from Drewes and others (1961, plate 75) and is thought to be accurate within about a 1.6 km radius.
Geology: Twenty to thirty acres of bare ground in summit crater icecap of Makushin Volcano contain several active fumaroles and vents. Decomposed basalt is altered to a gray-creamy white mantle more than 5 m thick. The richest sulfur deposits are within 2 feet (0.7 m) of surface, but some are present up to 16 feet (5 m) deep. Sulfur is most conspicuous along cracks and crevices, and as incrustations around fumarole vents. Probably not more than 5 acres of the area contain high grade deposits of sulfur (Maddren, 1919).
Workings: Some drilling up to 16 feet (5 m) deep during sampling by USGS (Maddren, 1919).
Alteration: Hydrothermal alteration of basalt(?).
Production: According to Veniaminov (1840), there was some production of sulphur during Russian occupation.
Reserves: Only about 5 acres contain high-grade ore; estimated at 1,800 tons per acre within 2 feet (0.7 m) of surface. Lower grade material or deeper may yield as much as 4,900 tons of sulfur per acre to a 16 foot (5 m) depth (Maddren, 1919).
Commodities (Major) - S
Development Status: Yes; small
Deposit Model: fumarolic sulfur, hydrothermal, volcanogenic
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| Link to USGS - Alaska: | UN003 |
|---|
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