North Keystone

United States· CaliforniaUnknown
Contained Copper
—
Average Grade
2.20%
Deposit Type
VMS — Bimodal-Felsic
Discovery Year
1861

Overview

Massive elongate lenticular bodies, stringer zone of interconnected anastomosing veinlets, dissemination.

Geological Context

Tectonic Setting: Siliciclastic-felsic in mature epicontinental arc

Resources & Operations

Production Start: 1861

Data Provenance

Source: USGS MRDS

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