Mobile Anti-Disturbance Squad (ESMAD). Armed police prepare to close illegal gold mines by force. Police operation to close mines operated by small traditional miners. The Colombian government says it wants to control illegal mining and is giving licenses to big multinationals. Colombia is poised this year to pass from rank 16 to 7 in the worlds biggest gold exporters list and there is huge interest among foreign companies, as extractions cost are still relatively low.