Posted by Richard from SE AZ on March 31, 2011 at 21:48:35 from (206.169.89.203):
In Reply to: coal miners posted by onedeere37 on March 31, 2011 at 08:57:04:
I am a retired underground miner having worked in hard rock mines all over the West ,Alaska and a few foreigh countries.As has been mentioned before, the rock bolts ,as they are called, are used to hold up ground that may loosen if not kept tight against itself. There are different types. the old style are expansion bolts that have a threaded wedge in the center of the shell that is pulled into two ridged metal wings that tighten against the ground. More common now are split set bolts that work like a roll pin and tighten when they are driven into a hole of smaller diameter. There are also support bolts that are concreted in and some that use epoxy cartridges that mix when the bolt is rotated into the hole. All have a plate on the end that bears against the ground. It is illegle to EVER remove a bolt that has been installed. That is an MSHA infraction of the highest magnitude.
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