Wanganui-based mine safety consultant David Feickert says New Zealand's mines should, in theory, be safer than China's, but Pike River has disproved that notion.
Last week, Mr Feickert returned to China, where he advises the Chinese Government on mining safety.
His current project addresses lung diseases caused by the inhalation of dust created by the mining process.
Mr Feickert said New Zealand's large mines should have been much safer than those in China, because it was a developing country.
"Sadly, the Pike River tragedy showed us all that our safety legislation and practice was ... very weak and must be changed."