"The Colombian government is seeking ways to legalise the black market," he said.
He said mainly surface mining up to 15 metres underground has been widespread in the Choco region.
"In processing the ore, they often apply mercury and cyanids," Sourek said, referring to the situation he could see in Colombia last September.
In view of the turbulent security situation in Colombia, the Czech experts were accompanied there by an armed military unit provided by the local authority.
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