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 coal mined in South Africa is exported, most of which leaves the country via Richards Bay. Coal is South Africa's third largest source of foreign exchange; platinum being the largest and gold second. Around 15% of the country's GDP (2000 estimate) is spent on energy and 77% of that is derived from coal. In 2004, the coal and lignite mining industry generated a gross income of R39 billion and directly employed 50,000 people. The Witbank Coalfield accounts for 40% of South Africa's coal production. The five largest coal mining companies account for around 85% of all production. They are Anglo