|Quadrangle map, 1:250,000-scale||BT|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 1,100 feet on the ridge about 0.75 mile west-northwest of the outlet of Sithylemenkat Lake. The location is accurate to within one-half mile.|
Geologic descriptionThis occurrence consists of chromite as an accessory mineral in mafic and ultramafic rocks (Foley, 1992). The rocks are part of the Caribou Mountain-Melozitna ultramafic belt which hosts chromite occurrences elsewhere. The rocks that define the belt consist of serpentinized dunite, peridotite, and gabbro. A serpentinite sample from a frost boil contains 700 ppm cobalt, 3,000 ppm chromium, and 500 ppm copper (Foley, 1992). Kurtak and others (1999 and 2002) report that 3 samples of serpentinized dunite and/or gabbro contain as much as 0.74 percent chromium, 120 ppm cobalt, and 2,400 ppm nickel. Disseminated chromite was observed in the sample with the highest chromium value.
|Geologic map unit||(-151.451137884787, 66.1276111277059)|
|Mineral deposit model||Podiform chromite (Cox and Singer, 1986; model 8a).|
|Mineral deposit model number||8a|
|Alteration of deposit||Serpentinization.|
|Workings or exploration||Only surface sampling.|
|Indication of production||None|
Additional commentsSee also: Caribou Mountain (BT011).
|Reporters||J.M. Britton (Anchorage)|
|Last report date||8/1/2002|