Here is a picture that Steve Boisen took at Mt. Carroll last year when he was up there making Rip Rap for us.  Steve runs one of our PC200 Komatsu backhoes.  And most of the time he has a hammer on it making Rip Rap throughout the whole company.

     The round dots on the floor are bore holes in a drilling pattern that have been previously shot years before.  It creates somewhat of a dimple in the solid rock floor, and then fills up with fines.  Moisture has darkened these spots to where there are very visible.  Thanks Steve for the pictures.