Goethite

specimen number:
2102317

location:
Orient Mine, Saguache Co., Colorado, USA

description:
Lustrous black botryoidal goethite across the top of matrix. In good condition. Very choice for the species in this Colorado locality.

The Orient Mine, located in the northern San Luis Valley of Saguache County, Colorado, is situated along the western flank of the Sangre de Cristo Mountains. Geologically, the deposit consists of iron-rich replacement bodies within the Mississippian-age Leadville Limestone, where primary carbonate minerals were oxidized and replaced by secondary iron oxides. The mine is a classic locality for goethite, which occurs as dark, lustrous botryoidal (grape-like) masses, velvety coatings, and occasional stalactitic formations within the cavernous ore zones. Historically, the Orient Mine was the largest producer of iron ore in Colorado during its peak years, with industrial mining and quarrying operations beginning in 1880 to supply the Colorado Fuel and Iron Company (CF and I) steel mills in Pueblo. Underground and open-pit extraction continued steadily through the late 19th century until the mine was officially closed in 1932 due to the depletion of easily accessible high-grade ore and the economic pressures of the Great Depression. Today, the site is managed as part of a grizzly bat trailhead and is well-known to mineralogists for its abundant iron oxide specimens and its significant contribution to the early industrial development of the Rocky Mountain region.

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