Once hitting "blue ground" or unweathered kimberlite individual mining became more difficult, slower and less profitable due to encountering harder and harder rock.
Wealthy miners began buying up the claims from despondent individual and small operations around them and one or two large consolidated mining companies began to emerge.
Dynamite was used on the hard rock and shaft were sunk next to the pipe to begin mining the pipe from the side and below.
Some of the other mine buildings and other paraphernalia have been restored and preserved as part of the exhibit.
From this angle you can get a good view of the suspension apparatus installed for viewing the big hole.
The Big Hole. What is the big hole and where is it?
The Big Hole: Part of a greater whole
The Big Hole: Kimberlites, how do they form.
The Big Hole: Diamonds are a girls best friend...
The Big Hole: The other beauty in kimberlites and a wealth of information.
The Big Hole: Information capsules from the deep.
The Big Hole: Setting and Suspension - from busy.org
The Big Hole: Digging the hole.
The Big Hole: Digging back into time