The Chilean Exploration Company, a subsidiary of the Anaconda Copper Mining Company, had been operating the copper mines at Chuquicamata since 1905. Together with the Braden Copper Company and Anden Copper Mining, these three North American companies controlled 95 per cent of copper mining. As copper was the country’s most important source of foreign exchange, the nationalisation of the copper mines became one of the most important political tasks. In 1971, Salvador Allende nationalised the copper industry, a measure that even the military junta was unable to reverse following its coup. - Book: Picture 171 - Chile - 1976