Mitsubishi Corp. (8058.TO) said Wednesday it will double its natural-resources assets in the next eight years while accelerating its ongoing expansion of its customer base from Japan to other Asian countries.

Mitsubishi owns assets to produce 7 million metric tons of liquefied natural gas, 20 million ton of coking coal and 250,000 tons of copper per year, all of which it aims to double by around March 2021, the company said in a statement. It didn't say how much it plans to invest.

The company will be able to meet most of its target by fully developing its existing assets, said a spokesman. "We may also replace some assets," he added.

Mitsubishi will hold an investors meeting from 0700 GMT Thursday to explain the plan in detail.