Cuprite (var. Chalcotrichite)

Bright red aggregates cuprite (var. chalcotrichite) inclusions in clear euhedral calcite crystals.

The New Cornella deposit was discovered by the Spaniards in 1750. First produced copper in modern times in 1917. The working is a huge open-pit operation (about 3,000 feet (ca. 914 m) long and nearly 2,000 feet (ca. 610 m) wide) at 750 feet (ca. 229 m) deep. Haulage was by internal railroad installed in the pit. Total production from 1917 through 1972 amounts to some 350,000,000 tons of ore averaging about 0.8% Cu, 0.05 ounce (1.89 g) Ag/ton and 0.004 ounce (0.15 g) Au/ton. Higher grade ore was mined in the early years and lower grade ore in more recent years.*

*https://www.mindat.org/loc-3370.html