Quadrangle map, 1:250,000-scale | CA |
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Quadrangle map, 1:63,360-scale | C-5 |
Latitude | 65.51 |
Longitude | -161.33 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | The Jack placer mine is at an elevation of about 850 feet on a west-flowing tributary to the south fork of Quartz Creek. The map site is in section 11, T. 1 N., R. 13 W., of the Kateel River Meridian, and the coordinates are for the approximate midpoint of the placer ground. Cobb, 1972 (MF-389), location 32. |
Geologic descriptionQuartz Creek heads in syenite of the Late Cretaceous, Granite Mountain pluton. Bedrock at the Jack placer mine is syenite and Jurassic-Cretaceous andesite. Fragments of narrow quartz veins and pegmatites occur in the placer. Placer gold is concentrated in the stream for approximately 1 mile. Some platinum has been recovered with the gold. Heavy minerals collected from stream gravels over syenite bedrock contained sphene, melanite, magnetite, hornblende, zircon, thorite and uranothorite. Samples collected over andesite bedrock contained hornblende, magnetite, ilmenite, spinel, and hematite (Gault and others, 1953). | |
Geologic map unit | (-161.332645084061, 65.5093279624569) |
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Mineral deposit model | Placer Au-PGE (Cox and Singer, 1986; model 39a). |
Mineral deposit model number | 39a |
Age of mineralization | Quaternary. |
Indication of production | Yes; small |
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Additional commentsStream gradient approximately 100 feet per mile. |