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The article doesn’t list Mponeng’s exact depth; however, according to Wikipedia, it extends over 3.8 kilometers below the surface. With so much dirt between its bottom and the outside world, many wonder just how the legions of miners that work its depths disappear and emerge into and out of its abysmal depths. The answer is, of course, dependable mine cages.

The mine cage has been around for quite some time, having evolved from simple human-powered, pulley-driven wooden boxes used to ferry miners in mine shafts of the days of old. With each evolution, the development of superior mine personnel cages has increased the depths at which man can safely mine.
http://www.wabicorp.com/better-mine-cages-enable-development-deeper-mines/

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