Re: what are these holes in these rocks?
Posted: Thu Sep 22, 2011 4:09 pm
Definitely blast holes, probably made by a portable rock drill as others have suggested. In the eastern Sierra back before 9/11 I frequently saw trail crews having more fun than on the 4th of July drilling rocks for blasting that 2 big guys ( or maybe 1) could have easily moved off the trail with digging bars; they had lots of military surplus tetrytol. A lot of these holes were never loaded, and are still to be seen. They also pinned rocks in place with sections of 1 inch rebar in drilled holes.