https://e2energiaeficiente.com/clientes/cerrejon/cerrejon/
Cerrejon - E2 energía eficiente
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https://colombiareports.com/union-cerrejon-agree-on-wages-strike-prevented/
Union, Cerrejon agree on wages; strike prevented - Colombia News
Feb 6, 2011 - Workers of Cerrejon, Colombia’s largest coal mine, have reached a deal with the mine’s directors on an increase in wages and called off the planned strike....
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