by yetibob3 » Thu Sep 22, 2011 4:09 pm
by Marcsoltan » Thu Sep 22, 2011 7:46 pm
MoapaPk wrote:Marcsoltan wrote:These look like the kind of holes left behind after a large boulder is blasted into pieces by a dynamite. I have seen holes like these on canyon walls, rock formations next to a trail, and even on creek beds. If the explosive is not pushed all the way into the hole, what's left behind is a hole that doesn't go through the rock.
So far that seems most believable-- except it is odd that one is in a boulder with rounded edges...
by pdeangeli » Thu Oct 13, 2011 8:53 pm
by Gafoto » Sun Nov 20, 2011 12:12 pm
yetibob3 wrote: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.
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