Crazy photo of conditions at Mt Isa
Luckily however this side of the world (ie NOT South Africa), temperatures aren't that extreme. Mt Isa (I assume its a Mt Isa mine?) is one of the few mines in Australia that are so hot that it requires the air to pass through a giant regrigerator prior to being sent underground.
I'll add my thoughts to this thread properly when I get time maybe later in the week. Like alot of these guys I'm a professional in the industry, but we've seen enough unskilled workers come into the fold.
Ps. I like throwing bolts for a jumbo - I'd love a job that doesn't require a high level of thought every day (note that just because it doesn't require thinking doesn't mean you can totally switch off. Its quite a dangerous job too I'd argue).