I think you might be underestimating the costs of doing it commercially.

Judging from the photos, The mountain looks like one big rock. You would surely need a hydraulic breaker on your backhoe, and the maintenance that would go with it for so much work. Also, it looks like it would be hard to get a backhoe on top of that steep mountain.

I would have thought for something like this, drilling deep holes and shoving in some TNT would be the way to go in order to reduce the solid rock to rubble.