Preassessment of the Holy Cross quadrangle, west-central Alaska
- Geological Survey, Menlo Park, CO (United States)
- Geological Survey, Anchorage, AK (United States)
- Geological Survey, Denver, CO (United States)
The preassessment program of the US Geological Survey is a team effort to collect and integrate all available geoscience information on poorly known areas in order to determine what future investigations are needed to evaluate the mineral resource potential of those areas. Preassessment investigations of the Holy Cross quadrangle were undertaken because the area is one of many in Alaska that still lack adequate geoscience information for resource assessment. To start, a reconnaissance geologic map at 1:250,000 scale, the first ever for the quadrangle, was compiled from unpublished field notes of a number of Survey geologists. The map reveals that bedrock dominantly consists of Tertiary volcanic and some granitic rocks, Cretaceous volcanic and sedimentary rocks, and some ophiolitic rocks of late Paleozoic-early Mesozoic age. Synthesis of geophysical data from the quadrangle resulted in an isostatic residual gravity map, and from NURE data, a magnetic intensity grid map. No geochemical data are available, but some assumptions could be made by projecting the results of resource studies from nearby areas. On the basis of this newly-compiled information, the occurrence of five metallic mineral deposit types are considered possible in the quadrangle. These are: (1) Epithermal Hg-Sb[+-]Au[+-]Ag vein deposits; (2) Au-W vein deposits; (3) Cu-Zn and Cr-Cu-Ni-PGE deposits; (4) Cu-Ag-Sn polymetallic vein deposits; and (5) Skarn deposits.
- OSTI ID:
- 5451845
- Report Number(s):
- CONF-9305259-; CODEN: GAAPBC
- Journal Information:
- Geological Society of America, Abstracts with Programs; (United States), Vol. 25:5; Conference: 89. annual meeting of the Cordilleran Section and the 46th annual meeting of the Rocky Mountain Section of the Geological Society of America (GSA), Reno, NV (United States), 19-21 May 1993; ISSN 0016-7592
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
POLICY AND ECONOMY
58 GEOSCIENCES
ALASKA
MINERAL RESOURCES
MAPPING
RESOURCE ASSESSMENT
COMPILED DATA
DATA COMPILATION
ORES
RESOURCE POTENTIAL
DATA
DEVELOPED COUNTRIES
INFORMATION
NORTH AMERICA
NUMERICAL DATA
RESOURCES
USA
290400* - Energy Planning & Policy- Energy Resources
580000 - Geosciences