ocr: The Philippines is the world's biggest supplier of refractory chrome. Copper is also a signiticant export. Many areas ofthe country have yet to be surveyed and estimates suggest 90% of: mineral potential remains undeveloped. Oil production off Palawan began in 1979. The Philippines is the world's second biggest user of geothermal power after the USA. Almost 25%0 of electricity on Luzon is providedby this method. In 1989, timber exports were halted. However, illegal logging and slash-and-burn farming still cause deforestation.
