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Businesses We own strategically located, proven, long-life reserves of high-quality industrial minerals. Great Lakes Minerals The largest and highest-quality limestone producer on the Great Lakes, with quarries, processing plants, docking facilities and the largest fleet of self-unloading U.S.-Flag vessels on the Lakes. Global Stone Operates 12 limestone quarries and lime and limestone processing facilities serving customers located primarily in the Mid-Atlantic and southeastern United States. Performance Minerals Mines and processes specialized industrial minerals, primarily high-purity silica sands and muscovite mica, with ten facilities in the southwestern United States, two in Ohio and one in North Carolina. |
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