Para las labores subterráneas clasificadas en la Categoría I, excepto minas que no sean de carbón, se debe hacer un control de metano, por lo menos, una vez por semana o cuando haya indicio de la existencia o presencia del mismo.
Decreto 1335 de 1987 →In force
Article 35
Decreto 1335 de 1987 · mediante el cual se expide el reglamento de seguridad de las labores subterráneas.
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