NZ miners

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Article #980

#980

From: DonH
Date: Mon, 22 Nov 2010 19:20

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With advent of a fifth day, hope of trapped coal miners being still alive 
may be fading.
  Toxic gases are as bad a danger as rock fall, if not worse, and many 
people in domestic fires are killed by fumes from burning synthetic curtains 
and carpets.
  The old means of gas detection was "the canary in the coal mine", and when 
the canary dropped dead you knew you were in trouble.
  In the past, mine owners were notoriously indifferent - when labour was 
plentiful, and life was cheap.
  Today, more care may be taken, but mining has always been a hazardous 
occupation.
  Can risk be minimised?
   It is BUILD-UP of toxic gases which is cause of explosion or fire-storm; 
hence, constant ventilation seems indicated - the pumping in of air down one 
shaft, and extraction at another (at opposite ends of mine).  Passive 
ventilation being insufficient, though maybe adequate in non-coal mines.
   Might be expensive, but gases extracted could offset this, if put to some 
use.

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From: "DonH" <donlhumphries@bigpond.com>
Newsgroups: aus.science
Subject: NZ miners
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