<Tr> <Td_colspan="7"> Source: President Evo Morales Ayma, Informe de Gestión 2013, p. 122, 138 . </Td> </Tr> <P> Corporación Minera de Bolivia (Comibol), created in 1952 by the nationalization of the country's tin mines, was a huge multi-mineral corporation controlled by organized labor and the second largest tin enterprise in the world, until it was decentralized into five semi-autonomous mining enterprises in 1986 . In addition to operating twenty - one mining companies, several spare - parts factories, various electricity plants, farms, a railroad, and other agencies, Comibol also provided schooling for over 60,000 children, housing for mining families, health clinics, and popular subsidized commissaries called pulperías . By 1986 Comibol employed more non-miners than miners . </P> <P> Observers severely criticized Comibol's mining policies . Comibol took fifteen years to bring tin production to its prerevolutionary levels . In addition, Comibol failed to invest sufficiently in mining technology and existing mines, and it proved unable to open new mines . Indeed, except for the mid-1960s Comibol did not engage in exploration . In terms of administration, worker control eclipsed even technical and detailed administrative decisions . </P> <P> The decentralization of Comibol under the Rehabilitation Plan reduced the company's payroll from 27,000 employees to under 7,000 in less than a year . All of Comibol's mines, previously responsible for the bulk of mining output, were shut down from September 1986 to May 1987 to examine the economic feasibility of each mine; some never reopened . Comibol's mining and service companies were restructured into five autonomous mining subsidiaries (in Oruro, La Paz, Potosí, Quechusa and Oriente), and two autonomous smelting companies (the Vinto Smelting Company and the still unopened Karachipampa smelter in Potosí), or they were transferred to ministries such as the Ministry of Social Services and Public Health or the Ministry of Education and Culture . The bureaucracy also underwent major administrative changes . </P>

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