Yet another foreign miner in the Democratic Republic of Congo is reviewing its future production plans after the government increased taxes and removed investor safeguards despite industry protests. MMG, the Chinese-owned copper producer, is considering whether to invest in more expensive methods of mining the metal when existing oxide resources are depleted. It’s grappling with the same quandary facing units of Glencore and Eurasian Resources Group, which have either downsized or suspended activities at copper-cobalt mines in the central African nation as they challenge the new mining code.