Saturday's accident in the central province of Henan was the first major incident in China's notoriously dangerous mines since the dramatic rescue last week of 33 miners trapped for more than two months in Chile, which was watched worldwide.

State media joined Chinese Internet users in condemning the country's existing safety procedures, saying more needed to be done to reduce the massive mining death toll, which last year topped 2,600.

At the mine in the city of Yuzhou in Henan, rescuers pulled more bodies out of the dank coal pit, bringing the death toll to 31, with six still unaccounted for, the State Administration for Work Safety said.

Rescuers said Sunday there was little hope of finding any more survivors.

China National Radio said the "rescue and clean-up work was expected to be finished" by Wednesday. It added the air was still thick with gas in the accident zone, hampering relief efforts.

Du Bo, the deputy director of the rescue operation, said the missing miners were likely to have been buried in more than 2,500 tonnes of coal dust that smothered the pit after the gas burst.

A total of 276 miners were at work below ground when the disaster happened, of whom 239 made it to the surface, the national work safety agency said.

Independent labour groups say the actual number of mine deaths in China last year was probably much higher than the seven people a day estimated by the government.

Authorities have repeatedly vowed to shut dangerous mines and increase safety, but accidents continue with regularity as mines rush to pump out the coal on which China relies for about 70 percent of its energy.

On the Internet reaction has been swift and bitter -- with many making unfavourable comparisons to the situation in Chile.

"The Chilean miracle has signed the death warrant of the mine safety system in China," one user with the screen name Xiaodaoren wrote on sina.com's popular Twitter-like microblogging service. "If we don't fundamentally resolve these mine security issues, the accidents will not stop and we will be unable to avoid the deaths and injuries."

Another, named Cheng Jing, 33, wrote: "The difference with Chile is enormous. The mines here are not inspected enough and poorly managed."

Chilean President Sebastian Pinera offered to help China, saying during a visit to London that his country had learned from the San Jose mine disaster.

But the large majority of mining accidents in China occur in collieries, which present different risks to Chile's copper and gold mines such as the San Jose pit.

Survivor Chen Jiaguo told the Beijing News that safety zones in the mine were mostly filled with debris -- not survival equipment and basic necessities.

"There was no rescue equipment in the tunnels, no food or water and most of the time the safety zones were filled with scrap metal and debris," the paper cited Chen as saying. "Other than that, the ventilation fans were not strong enough and did not ventilate the air enough."

In an editorial, the state-run newspaper said China's efforts were not good enough.

"If we cannot in the shortest amount of time possible build emergency rescue systems in our mines and give miners a chance to live... then more and more miners are going to be placed in harm's way," it said.

In July, Premier Wen Jiabao lamented China's "serious" work safety situation and ordered mining bosses to work side-by-side with workers in the pits to ensure companies observed safety rules.

To satisfy that requirement, a deputy chief engineer was in the Yuzhou mine at the time of the gas outburst and helped evacuate miners, the China News Service reported.

China had its own "miracle" mine rescue in April when 115 miners were rescued after more than a week trapped underground in a flooded mine shaft in the northern province of Shanxi.

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