Last week's accident, which briefly sent Glencore's shares tumbling 7%, underscored foreign investors' exposure to illegal mining activity on their properties.
Asian demand for the heating fuel is expected to top out this year, as large consuming countries, including China, turn to cleaner energy such as hydropower.
Congo's interior minister vowed to remove all illegal miners by Sunday from a copper and cobalt mine run by Glencore following a landslide this week that killed at least 43 of them.