Copper

specimen number:
8311507

location:
Bisbee, Cochise Co., Arizona, USA

description:
A set of three nicely crystallized native copper thumbnail specimens. All in good condition, size provided for the largest cluster.

The Bisbee mining district, centered around the Mule Mountains in Cochise County, Arizona, United States, is a historically monumental underground and open-pit mining center internationally celebrated for its massive production of copper, lead, zinc, silver, and gold, as well as classic secondary copper minerals like azurite and malachite. Geologically, this prolific district is defined by the Warren mining district porphyry copper system, where a Jurassic-age granitic intrusion known as the Sacramento Stock fractured and mineralized surrounding Paleozoic-age sedimentary formations, particularly the highly receptive Escabrosa and Martin Limestones. Intense, multi-stage hydrothermal replacement created immense primary sulfide bodies that subsequently underwent profound, deep supergene weathering, forming spectacular oxidation zones filled with rich carbonates, oxides, and native metals within cavernous underground voids. Historically, the first claims were staked in 1877, and the rapid influx of capital led to the formation of corporate giants like the Copper Queen Consolidated Mining Company and the Calumet and Arizona Mining Company, turning Bisbee into one of the largest cities in the American West by the turn of the century. Large-scale operations shifted from deep, complex underground networks to massive open-pit quarrying at the Sacramento Pit starting in 1917, and later at the Lavender Pit, which operated from 1950 until its closure in 1974. Due to the depletion of economically viable ore bodies, Phelps Dodge Corporation officially ceased all large-scale commercial mining operations in Bisbee in December 1975, ending nearly a century of continuous industrial production that yielded billions of pounds of copper. Through 2026, while industrial extraction remains inactive, the historic town preserves its legacy through the Copper Queen Mine tour, remaining a global geological benchmark for studying limestone-hosted porphyry copper replacement and oxidation phenomena.

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