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The Triangular Plan was implemented in Bolivia by the governments of the United States and the Federal Republic of Germany, with financing from the Inter-American Development Bank, during the Cold War. Its objective was to confront the communist threat in Bolivia and its spread in Latin America. The United States promoted a strategy to guide the development process in Bolivia, first through the Alliance for Progress and then through the Triangular Plan, which sought rehabilitation, but whose covert policy was to denationalize state mining. 

Melvin Burke, USAID economist in the Triangular Plan, denounces that "it was a Trojan horse, which had no economic basis except to destroy the communist trade union...". For its execution, they created the Advisory Group, dependent on the IDB, with prerogatives above COMIBOL and the Bolivian Government. The Plan achieved the strangulation of Bolivian state mining, to favour private mining. 

In May 1965, mine workers were laid off massively and partially rehired with half their salaries. To this end, the military government of Rene Barrientos declared the mining centers military zones, ordered persecution, selective assassinations, and the exile of mining union leaders. This documentary corpus is made up of: a) Report on the mining companies integrated into the Bolivian Mining Corporation, which will serve as the basis for the application of the Triangular Plan of Salzgitter Industriebau Gesellschaft, GMBH; b) Correspondence about the Triangular Plan of the Presidency of the Mining Corporation of Bolivia; and c) Correspondence of the Advisory Group of the Triangular Plan of the Mining Corporation of Bolivia.