Island Mountain

United States· CaliforniaUnknown
Contained Copper
—
Average Grade
—
Deposit Type
VMS — Bimodal-Mafic
Discovery Year
1897

Overview

Massive lenses, kidney shaped. Also brecciated and disseminated ores. Possible faulted extension to the northwest. Produced 112,000 t @ 3.3% Cu, 2.23 g/t Au, 37 g/t Ag. Pre-mined reserves 249,500 t ore.

Geological Context

Tectonic Setting: Pelite-mafic in mature oceanic backarc

Resources & Operations

Production Start: 1915

Data Provenance

Source: USGS MRDS

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