Afterthought

United States· CaliforniaUnknown
Contained Copper
—
Average Grade
3.23%
Deposit Type
VMS — Bimodal-Felsic
Discovery Year
1862

Overview

Massive elongate lenses, 0.15 km thickness, stringers below 5 orebodies, dissemination, 18 orebodies.

Geological Context

Tectonic Setting: Siliciclastic-felsic in mature epicontinental arc

Resources & Operations

Operator: 0

Production Start: 1869

Data Provenance

Source: USGS MRDS