The methane blast occurred at around 1245 GMT at La Escondida mine in the central province of Cundinamarca, a spokesman from the state Institute of Geology and Mining told AFP.
It was not immediately clear if more casualties were feared.
President Juan Manuel Santos cut short a trip to Europe last week to be at the side of the victims of a blast last Wednesday that left 21 miners dead at a coal mine in the northeast of the country.
Mines Minister Carlos Rodado pointed last week to a glaring lack of resources and said the government needed to radically rethink its oversight of the industry.
Colombia is the world`s fifth largest coal exporter. (*)
Editor: Kunto Wibisono
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