State-owned China Energy Investment Corp is ramping up efforts to dispatch coal from production hubs such as Shaanxi and Gansu provinces to Sichuan province and Chongqing.

The upgrades, targeted to promote clean production and improve efficiency, have brought about both environmental and economic benefits.

The industry has also stepped up efforts ensuring safe mining in recent years, Sun said.

As a large coal supply base, Xinjiang aims to achieve coal output of more than 400 million tons by 2025.

Steel, magnesium and its products, and coal are among the major exported commodities.

An executive of the company said such a practice has multiple benefits in both economic and environmental terms.

China's State Administration for Market Regulation has conducted investigations on activities of bidding up coal prices, the administration said Friday.

According to the administration, China saw 190 mining accidents in the January-July period, down 14 percent year on year.