The plan will tighten Kinshasa's grip on the world's biggest cobalt producer and second-largest copper supplier, according to an official and seven industry sources, and could be even more significant than the country's policies that reshaped the global cobalt market, some analysts say.

The policy comes as competition intensifies between the United States and China for access to critical minerals.

The plan will tighten Kinshasa's grip on the world's biggest cobalt producer and second-largest copper supplier, according to an official and seven industry sources, and could be…