|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of 4,700 feet about 2.25 miles east of lower Eureka Glacier. It is in the eastern headwaters of locally named Landslide Creek, a south-flowing tributary of Eureka Creek, and about one-half mile south-southwest of the center of section 29, T. 18 S., R. 8 E., Fairbanks Meridian. The occurrence corresponds to locality 41 in table 2 of Nokleberg and others (1991) and to locality 6 in figure 3 of Rose (1966 [ADMM GR 20]).|
This occurrence is in an Upper Triassic sill-like body of serpentinized dunite that can be traced continuously for more than 5 miles (Rose, 1966 [ADMM GR 20, figure 3]). The body is the main unit of the informally named Eureka ultramafic complex that occupies strands of the Broxson Gulch thrust fault (Nokleberg and others, 1991; W.T. Ellis, unpublished data, 1996).The occurrence consists of veins and discontinuous lenses of opal, calcite, chrysotile, magnetite, chromite, and an unidentified green glassy mineral (Rose, 1966 [ADMM GR 20, p. 20]). Chromite is also disseminated in the dunite. No assay data are available.
|Geologic map unit||(-146.259865237542, 63.3182770897706)|
|Mineral deposit model||Disseminated and vein-like masses of chromite in a mafic-ultramafic sill-like body.|
|Age of mineralization||Late Triassic, the age of the host rock.|
|Alteration of deposit||All of the ultramafic rock units are moderately to strongly serpentinized.|
|Workings or exploration||The occurrence is on active MAN Resources claims.|
|Indication of production||None|
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
|Reporters||W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)|
|Last report date||6/18/2001|