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Economic significance of revised age relations of rocks in the Cornucopia mining district, Elko County, Nevada

Circular 549

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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.

Additional Publication Details

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
Edition:
-
Year Published:
1967
Language:
ENGLISH
Publisher:
U.S. Dept. of the Interior,
Description:
iii, 4 p. :maps. ;27 cm.