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The Michigan Limestone and Chemical Company operated the world's largest limestone quarry (Michigan Limestone; a/k/a the "Calcite Quarry"; "Calcite Plant and Mill"; and "Carmeuse Lime and Stone"), which is located near Rogers City in Presque Isle County, Michigan. It was formed and organized in 1910; however, production did not begin until 1912.
The geology of the district consists of middle Precambrian rocks in the Animikie Group, which form a westward plunging syncline 33 miles (53 km) long and 3 to 6 miles (4.8 to 9.7 km) wide. The principal iron ore is found in the Negaunee Iron formation. This formation is 2,500 feet (760 m) thick near Negaunee. This is a magnetite or hematite chert.
Iron ore was mined from nine active mines and three reclamation operations in Michigan, Minnesota, and Utah. Most of the iron ore was mined in northern Minnesota's Mesabi Range. Net exports (exports minus imports) were 3.9 million tons. US iron ore made up 2.5 percent of the total mined worldwide in 2015.
This series of lava "is at least 15,000 feet thick in the Michigan copper district" and consists of "several hundred flood basalt flows." The district rocks are Precambrian in age and belong to the Keweenawan Series. The first six years of mining exploited the fissure deposits, then gave way to the amygdaloidal deposits.
Since the two ranges of hills are made up of dissimilar rock types, the rock formation containing the iron ore deposits is located exclusively within the southern (Gogebic) Range. The Gogebic Range experienced a speculative iron boom in the mid-1880s, and had recurring booms and busts from 1884 to 1967 as demand shifted.
The Detroit salt mine is a salt mine located 1,100 ft (340 m) below Detroit, Michigan. [1] The mine opened in 1910 and covers 1,500 acres (610 ha) underground. [2] In the beginning, the leather and food industries were the primary customers. Today, road deicing salt is the primary product. [3]
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