Safety wise, removing coal this way can prevent many injuries around the area, and it is a lot safer than doing it underground.
There is pretty much no chance of gas or roof falls that would kill any miners.
It is a LOT cheaper than doing it the traditional way.
It's easier for everyone all around
http://tpmdc.talkingpointsmemo.com/2010/07/rand-paul-mountain-top-removal-mining-enhances-the-land.php
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