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Entry Category: Mining - Starting with G

Gypsum Mining

Gypsum is a mineral (CaSO4·2H2O) that occurs in nature as both a mineral and, when in massive form, a rock. Massive deposits are present as sedimentary beds of varying thickness in the subsurface within the Trinity Group in southwest Arkansas. Gypsum beds dip gently to the south, being part of the Early Cretaceous Gulf Coast series of sedimentary deposits. The gypsum-bearing De Queen limestone member of the Trinity Group is exposed in a narrow belt extending from the Little Missouri River in Pike County westward through Howard and Sevier counties, and dips gently to the south. The thickest single gypsum bed (at twelve feet) is at Plaster Bluff (Pike County). A significant operation near Briar (Howard County) mines five beds …