Ostrava-Karviná Coalfield

in the North Moravian region, Czech Socialist Republic; the primary source of fuel in Czechoslovakia. Total area, 950 sq km. Reserves are about 11 billion tons to a depth of 1,800 m and 6–7 billion tons to a depth of 1,000–1,200 m. In a geological sense, the Ostrava-Karviná Coalfield is part of the Upper Silesian Coalfield. Coal seams occur comparatively close to the surface (800–1,000 m). Up to 80 percent of the coal is suitable for coking. The annual output is about 27 million tons.