Laguna del Maule (volcano) about fourteen shield volcanoes and stratovolcanoes that have been degraded by glaciation. The Laguna del Maule volcanic field covers a surface area of and contains cones, lava domes, lava flows, and shield volcanoes. There are 130 volcanic vents at Laguna del Maule. The lake is surrounded by 36 silicic coulees and lava domes. Over of the field is covered by these rocks, and volcanic ash and pumice produced by the eruptions has been found in Argentina. Presently some summits around Laguna del Maule reach altitudes of . The volcanic field lies at an average height of . Among the various
Coal in South Africa American plc, South32's "South Africa Energy Coal", Sasol Mining, Glencore Xstrata, and Exxaro . Open-pit mining account for roughly half of South African coal mining operations, the other half being sub-surface. Electricity generation accounts for 43% of all coal consumed in South Africa (1997 estimate). Many of the country's coal-fired power station are located in close proximity to a coal mine and are supplied with fuel directly from the mine. The Grootegeluk open cast mine on the Waterberg Coalfield in Limpopo is one of the largest in the country and feeds the Matimba Power Station with about 14.6 million tons