2012年(124)
分类: IT业界
2012-03-28 09:36:06
The mining industry has dramatically improved its record of safety over the
last few decades, but the industry still faces many safety risks. Recent
disasters have once again forced mining companies to look at how their
techniques and technologies can reduce those risks, and the safety of
sub-surface mining remains a controversial issue.
"The mining industry has
dramatically improved its record of safety over the last few
decades."
Looking at the US coal mining industry, for instance, it is clear
that the issue has been taken seriously. According to National Mining
Association, from 1970 to 2007 the number of fatalities fell by 87%, while
production rose by 87%. Furthermore, the number of injuries is down 70% since
1990. Nevertheless, disasters do happen.
In 2002, for instance, the Quecreek
Mine rescue saw nine coal miners in Pennsylvania trapped. In 2007, six were
trapped in a mine collapse in the Crandall Canyon Mine in Utah, which
investigators later blamed on faulty design.
Around the world, more serious
incidents have hit the headlines. A mine blast in Siberia recently killed 87
miners after a rockslide caused a build up of methane gas, with roof collapses
and smoke hampering rescue efforts. Most recently, however, it is disasters in
China that have brought the safety issue to the fore.
China remains the
world's largest producer and consumer of hard coal, and is a key producer of
other minerals but its industry is dogged by safety concerns. In June this year
27 miners were killed after an explosion at a mine in Shanxi province, adding to
the nearly 4,000 workers killed in accidents in 2007. Poor safety standards have
been blamed.
Though the number of fatalities in China is lower than previous
years, safety has caused the public and the industry to be concerned over the
standards and techniques currently in place. In the coal industry the focus has
fallen on the mechanics of room and pillar mining, where rooms are cut into a
coal seam with up to 40% of the coal left in place as pillar to support the
roof, and longwall mining, where mechanical shears extract the coal and
hydraulic supports hold up the roof until it is allowed to collapse when mining
is complete.
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