Because of the ice cover over most of the continent, only a few sites are actually available at which bedrock is exposed at the surface. |
Blast-enhanced fracturing is a process used at sites with fractured bedrock formations. |
Big bare spots opened, where whalebacks of naked bedrock reared up and plunged into ponds. |
The bedrock is dolomite with pH of 7-8, which is 15-24 m below the surface. |
A shallow shaft was excavated to bedrock, followed by drilling and blasting. |
Exposed layering is steepest in the northern flanks of the dome where it parallels the outer slopes of the bedrock collar. |