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High REE and Y concentrations in Co-Cu-Au ores of the Blackbird district, Idaho

Economic Geology

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DOI: 10.2113/gsecongeo.101.2.275

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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.

Additional Publication Details

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
Number of Pages:
6