Pit and Quarrynotes there are several things that can prove hazardous in mining that involves highwalls. Geological structures can influence highwall stability. Other factors include how strong the rock mass is. Weathering, water inflow, surface drainage, and erosion can make highwalls unstable. Unsafe drilling and …americanmineservices
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7.3.4: Highwall Mining | ABC 123: Testing Site / Course
03/07/2015· Highwall mining is very similar to auger mining in its concept, where the entry into the coal seam in made at the highwall of the ultimate pit limit. The difference lies in the use of a more sophisticated machine, known as a …