The Cliff Mine, discovered in 1844, is located on the Keweenaw Peninsula of Upper Michigan in the heart of the “Copper Country.” The huge masses of native copper, up to 100 tons, that were encountered turned the Cliff into a successful mining operation and made it the first mine on the “Keweenaw” to pay dividends to stockholders. Throughout its history, the mine also produced spectacular specimens of crystallized native silver and copper that now enrich museums and private collections the world over.