Corroded cog wheels are seen in an engine room of an old gold dredge anchored in the Atrato river in Quibdó, Colombia, 12 October 2019. A gold dredge is a mining machine employing an ancient artisan technique of placer gold mining (based on the different densities of gold and soil/sand) but applied by mechanical/industrial methods to increase the quantity of extracted gold. Today, advances in mining technology allowed the production of small dredges with high operation efficiency,...
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Corroded cog wheels are seen in an engine room of an old gold dredge anchored in the Atrato river in Quibdó, Colombia, 12 October 2019. A gold dredge is a mining machine employing an ancient artisan technique of placer gold mining (based on the different densities of gold and soil/sand) but applied by mechanical/industrial methods to increase the quantity of extracted gold. Today, advances in mining technology allowed the production of small dredges with high operation efficiency, carried easily to a remote location, and so the giant mining dredges are increasingly decommissioned and left to their fate.
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