Roscoelite type locality; gold and vanadium near Coloma, El Dorado County, California

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Authors:Post, James L.; Burnett, John L.
Author Affiliations:Primary:
Calif. State Univ., Sacramento, CA, United States
Dep. Conserv., Div. Min. & Geol., United States
Volume Title:California Geology
Source:California Geology, 38(5), p.99-102. Publisher: California Division of Mines and Geology, San Francisco, CA, United States. ISSN: 0026-4555
Publication Date:1985
Note:In English. 26 refs.; illus. incl. 2 analys., 2 tables, geol. sketch map
Summary:Roscoelite, vanadium mica, was first described from the Stuckslager mine on Granite Creek, El Dorado County, by James Blake in 1876. At the type locality, bladed roscoelite = or <1 cm in length is associated with gold and pyrite. A smectite clay interlayered with the roscoelite carries 1.7 wt.% V2O3. XRF analyses are reported for bladed and massive roscoelite carrying 17.67 and 15.79% V2O3 respectively. The V2O3 content of the metamorphic host rock ranges from 0.018 to 0.04%, but the intruding quartz monzonite commonly has only 0.010% V2O3. [A.P.]
Subjects:Complexes; Contact metamorphism; Economic geology; Gold ores; Granites; Granodiorites; History; Igneous rocks; Intrusions; Metal ores; Metamorphic rocks; Metamorphism; Mica group; Mineral exploration; Mineralogy; Minerals; Plutonic rocks; Plutons; Sheet silicates; Silicates; Vanadium ores; California; El Dorado County California; United States; Big Red placer; Coloma; Coloma Mining District; Roscoelite; Stuckslager mine; Thompson Hill placer; Tip-Top mine; Wagner mine
Abstract Numbers:85M/4512
Record ID:1985058591
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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