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After I picked out the stones, I watched the turning of a 250 ton ledge of stone. A chainsaw with a ten foot long bar makes cuts down through the stone. It makes cuts about 50 feet long as it moves down a track. Then, that track is moved over by 4 feet to free the next ledge. The stone is then drilled at the base and wedges are hammered into the drill holes, this cracks the stone across at the base.
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The cables of the crane are attached through pulleys attached to the ledge and down to the bottom of the pit. The crane then takes in the cables so the ledge will fall over onto the stone rubble.
Halfway there...
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And suddenly, the ledge has turned, dropping onto the stone rubble. It is now ready to be drilled into manageable sized blocks and lifted out of the pit.