High REE and Y concentrations in Co-Cu-Au ores of the Blackbird district, Idaho
Economic Geology
By: J. F. Slack
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Abstract
Analysis of 11 samples of strata-bound Co-Cu-Au ore from the Blackbird district in Idaho shows previously unknown high concentrations of rare earth elements (REE) and Y, averaging 0.53 wt percent ???REE + Y oxides. Scanning electron microscopy indicates REE and Y residence in monazite, xenotime, and allanite that form complex intergrowths with cobaltite, suggesting coeval Co and REE + Y mineralization during the Mesoproterozoic. Occurrence of high REE and Y concentrations in the Blackbird ores, together with previously documented saline-rich fluid inclusions and Cl-rich biotite, suggest that these are not volcanogenic massive sulfide or sedimentary exhalative deposits but instead are iron oxide-copper-gold (IOCG) deposits. Other strata-bound Co deposits of Proterozoic age in the North American Cordillera and elsewhere in the world may have potential for REE and Y resources. IOCG deposits with abundant light REE should also be evaluated for possible unrecognized heavy REE and Y mineralization. ?? 2006 by Economic Geology.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | High REE and Y concentrations in Co-Cu-Au ores of the Blackbird district, Idaho |
| Series title | Economic Geology |
| DOI | 10.2113/gsecongeo.101.2.275 |
| Volume | 101 |
| Issue | 2 |
| Year Published | 2006 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Economic Geology |
| First page | 275 |
| Last page | 280 |
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