Dolomite with Chalcopyrite

specimen number:
2062031

location:
Groveland Mine, Dickinson Co., Michigan, USA

description:
Colorless rhombohedral crystals of dolomite measuring to 0.4 cm in size across the front of matrix with micro chalcopyrite. The matrix is very rich and hematite. In good condition, collected in 1998.

The Groveland Mine in Dickinson County, Michigan was part of the Menominee Iron Range in the Upper Peninsula, a major iron mining district developed in the late 19th century. The mine worked iron ore from Precambrian banded iron formation using underground mining methods typical of the region. Production supplied ore to iron and steel industries around the Great Lakes during the peak years of iron mining. Like many mines in the district, operations eventually declined as ore reserves were depleted and mining shifted to other deposits.

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