BEIJING (AFP) - Around 40 people were missing in China on Wednesday after a landslide buried the living quarters of a mining company under one million cubic metres of earth, the local authorities and state media said.

The deluge shortly after midnight swallowed 15 employee dormitories and three residential houses in Shanyang county, in the northern province of Shaanxi, an official at the county's propaganda office told AFP.

Around 40 people were missing, said the official, who declined to be named.

The state-run Xinhua news agency said four people had been rescued by mid-morning and rushed to hospital. Another 10 at the site had avoided being trapped when the landslide hit, it added.

Police, firefighters, mining rescuers and medical staff had been sent to the scene and residents in the area evacuated, the county government said in a statement.

The mine's operator was identified by Xinhua as Wuzhou mining company, which according to its parent company is mainly a vanadium producer.

Separately, an accident at a coal and gas mine on Tuesday night in the southwestern province of Guizhou killed 10 people, provincial work safety authorities said in a statement.

Rescue efforts were under way, the statement on Wednesday said.

Xinhua reported on Wednesday that 56 miners left the shaft safely after the accident, with five injured and three more still missing.

China - the world's largest producer of coal - is grappling to improve standards in the sector, where regulations are often flouted and corruption enables bosses to pursue profits at the cost of worker safety.

Accidents in Chinese coal mines killed 931 people last year, a top work safety official said in March.

The official number of mining fatalities is declining but some rights groups argue the actual figures are significantly higher due to under-reporting.

The country is also prone to landslides, often caused by floods but with lax management of industrial sites sometimes also a factor.

In 2008, 277 people died in a mudslide in the northern province of Shanxi after an illegal mining waste reservoir burst its banks following heavy rain.

A total of 58 government and company officials were convicted over the disaster and sentenced to prison terms, some to life.

In 2013, a vast volume of rock crashed down a mountainside east of the Tibetan capital Lhasa, burying 83 people in a mineworkers' camp.