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Thank you for your comment @enforcer48. Yes for some type of stones as granite or marble in other areas they use those diamond saws and excavators, but here in our region we have sandstone with each layer of stone underlying on different angle to the ground surface, so it is impossible to use any machinery equipment because you have to think how to get every single stone out of the mountain layer and you have to look for the best crack in that mountain to apply wedge into it and then hit the wedge with your hammer with a certain amount of power to have the best result in this very stone size. So taking every single stone is hard though quite creative job to do.