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such as carbon monoxide and carbon dioxide, which form as byproducts of an explosion. The presence of these gases suggested there may still be some form of combustion occurring in the tunnel, Professor Hebblewhite said.

Gavin Mudd, an environmental engineer, said the mining industry's emphasis on safety made these sorts of accidents very unusual in developed countries.

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The explosion could have been caused by a pocket of methane that had built up in fractures of the rock.

He said an investigation would hopefully show the explosion was caused by a sequence of events that could not have been planned for, or whether the mine's operator may have cut corners.

''And there needed to be a source of ignition. But we don't know what either of those Burberry Purse Material

''It is a very dynamic situation,'' he said. ''There is still potentially a source of ignition which may come into contact with any other air gas mixture down there.''

''If they had all the [safety] systems in place it shouldn't have happened,'' Dr Mudd, from Monash University, said. ''The question at the moment is whether they did have that high standard in place.''

Methane gas explosions are the most common cause Burberry Crossbody Bag Black

The rescue teams were also monitoring the levels of other gases in the tunnel, Burberry Large Leather Duffle Bag

of accidents in coalmining, Dr Mudd said.

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''Chile was copper and Beaconsfield was gold. They were metalliferous minerals which generally don't contain these types of gases.

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The New Zealand disaster was different to the mining accidents that occurred at Beaconsfield and, more recently, in Chile, he said.

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A mining engineer, Bruce Hebblewhite, said ventilation systems were used to insert fresh air into coalmines Prada Sunglasses Ladies to dilute methane. For an explosion to have occurred the concentration of methane would have needed to reach a certain explosive level, he said.

Safety standards should have guarded against accident

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THE mining disaster in New Zealand was the result of something incredibly rare if all the correct safety standards were in place, an Australian engineer has said.

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''Both those accidents weren't explosions but falls of ground which trapped people on the other side,'' he said.

The explosion at the Pike River coalmine was caused by a build up of highly flammable methane gas, which is continually released from coal deposits.

''We don't know if there was one emission or whether there are continuing high levels of methane,'' Professor Hebblewhite said.

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were,'' Professor Hebblewhite, from the University of NSW, said.

THE mining disaster in New Zealand was the result of something incredibly rare if all the correct safety standards were in place, an Australian engineer has said.

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