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Old 15th Apr 2019, 11:17
  #135 (permalink)  
Join Date: Dec 2010
Location: Balikpapan, INDONESIA
Age: 66
Posts: 431
Originally Posted by G-CPTN View Post
I recently visited a 'heritage' site (Beamish Museum) and entered the drift mine.
Hard hats were issued to all visitors (to the mine) and I soon discovered why.
I am not tall, but nevertheless it wasn't long before my hat was striking the roof (even though I was stooping to avoid the obvious lack of clearance) - sometimes with enough impact to arrest my progress.
Apparently the height of the passageways was determined by the height of the ponies that pulled the trucks.
Very sensible in underground operations.
Many injuries and fatalities underground are from relatively small, individual rocks falling; much more common than cave-in type incidents.

Pretty much unheard of in open cast mines.

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