Copper

specimen number:
8311560

location:
Champion Mine, Houghton Co., Michigan, USA

description:

Attractive branching grouping of twinned native copper crystals. In great condition.

The Champion mine, situated near Painesdale in Houghton County within the south range of the historic Keweenaw Peninsula copper district, Michigan, United States, was a highly successful and phenomenally productive underground native copper operation. Geologically, this major stratiform deposit is hosted within the Mesoproterozoic-age Portage Lake Volcanics of the Midcontinent Rift System, where hot, deep-seated hydrothermal fluids mineralized the exceptionally rich and uniform Baltic Amygdaloid Lode, a porous and highly fragmental top of a basaltic lava flow that precipitated abundant native copper and native silver alongside localized zones of rare copper-arsenide minerals like domeykite and algodonite within a primary matrix of quartz, calcite, and epidote. Historically, exploration along the south range located the rich lode in 1898, and the Champion Copper Company was formally organized in 1899 as a joint venture between the Copper Range Company and the St. Mary's Canal Mineral Land Company to rapidly develop the property. Under the brilliant leadership of mining executives and geologists like Lucius Lee Hubbard, the company sunk seven massive, steeply inclined shafts numbered one through seven, pioneering advanced underground backfilling techniques and constructing the sprawling Champion stamp mill at Freda to process the exceptionally high-grade rock. The mine operated with immense profitability and served as a backbone of the regional industrial economy for decades until the profound financial hardships of the Great Depression, declining ore grades at extreme depths, and escalating operational expenses finally forced the permanent cessation of all underground mining extraction in 1932, though localized reclamation of copper-bearing stamp sands continued for some years afterward.

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