The state-owned company, also called Panjiang coal, has ordered safety inspections at all of its mines.
Sixteen people were killed in a coal mine accident in Panzhou city in southern China's Guizhou province on Sunday, according to a filing by the mine's owner, Guizhou Panjiang Refined coal Co, with the Shanghai Stock Exchange on Monday.
All coal mines in Panzhou city have suspending production for a day, according to Shanghai-based commodities consultancy Mysteel. Guizhou's mine safety administration told Reuters it did not have information on the situation.
The area has a total production capacity of about 52.5 million metric tons per year of mostly coking coal, representing about 5% of China's coking coal production capacity, according to Mysteel.
The state-owned company, also called Panjiang coal, has ordered safety inspections at all of its mines and has taken measures to ensure safe production, the exchange filing added.
The company operates seven coal mines with a total capacity of about 17.3 million tons. The mine where the accident took place has an annual capacity of 3.1 million tons, according to Mysteel.
The accident follows a string of similar incidents in the country's coal mines, including a collapse at an open-pit mine in Inner Mongolia region in February that killed 53 people.
Authorities have announced a measures to improve safety in the sector, including restrictions on smaller mines and plans accelerate the use of automation underground.
The accident took place in the early hours of Sunday morning in Sandu county, around 170 km (105 miles) southeast of the provincial capital, Guiyang, police said. The bus was carrying 47 people and the 20 injured were being treated on Sunday, police added.
The bus, which was driving north, broke through a barrier dividing two lanes on a motorway and crashed into a truck carrying 3 people moving in the opposite direction, said police from the city of Yixing in Jiangsu province.
A conveyor belt caught fire in the early hours of the morning, state news agency Xinhua cited the government as saying, which produced dangerous levels of carbon monoxide.
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