Economic significance of revised age relations of rocks in the Cornucopia mining district, Elko County, Nevada
Circular
549
By: Robert Roy Coats
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Abstract
Recent geologic work in the Cornucopia mining district, a small silver-gold mining district in northwestern Elko County, Nev., has resulted in significant revision of the geological interpretation. Rocks formerly thought to be premineralization in age, but unmineralized, are now known to be postmineral extrusives, resting unconformably on the altered andesite in which the ore bodies are found. Extensions of the known productive veins may be expected at shallow depth beneath the younger volcanic rocks, and are separated from the mined part of the veins by postmineral high-angle faults that have brought the younger volcanic rocks into fault contact with the mineralized andesite. Some veins are apparently terminated against premineral faults.
Suggested Citation
Coats, R.R., 1967, Economic significance of revised age relations of rocks in the Cornucopia mining district, Elko County, Nevada: U.S. Geological Survey Circular 549, iii, 4 p. :maps. ;27 cm., https://doi.org/10.3133/cir549.
ISSN: 2330-5703 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Economic significance of revised age relations of rocks in the Cornucopia mining district, Elko County, Nevada |
| Series title | Circular |
| Series number | 549 |
| DOI | 10.3133/cir549 |
| Year Published | 1967 |
| Language | ENGLISH |
| Publisher | U.S. Dept. of the Interior, |
| Description | iii, 4 p. :maps. ;27 cm. |