Editing Mining (section)

=== High wall ===
[[File:Mega HIghwall Mining ADDCAR 16.jpg|thumb|Coalburg Seam highwall mining at ADDCAR 16 Logan County WV]]
High wall mining, which evolved from auger mining, is another form of surface mining. In high wall mining, the remaining part of a coal seam previously exploited by other surface-mining techniques has too much overburden to be removed but can still be profitably exploited from the side of the artificial cliff made by previous mining.<ref>{{Citation|url=https://oilprice.com/Energy/Coal/Coal-Mining-And-The-Highwall-Method.html|title=Coal Mining and the Highwall Method|last1=Drum|first1=The Oil|date=November 26, 2010|publisher=A Media Solutions|access-date=September 6, 2021|archive-date=September 6, 2021|archive-url=https://web.archive.org/web/20210906001207/https://oilprice.com/Energy/Coal/Coal-Mining-And-The-Highwall-Method.html|url-status=live}}</ref> A typical cycle alternates sumping, which undercuts the seam, and shearing, which raises and lowers the cutter-head boom to cut the entire height of the coal seam. As the coal recovery cycle continues, the cutter-head is progressively launched further into the coal seam. High wall mining can produce thousands of tons of coal in contour-strip operations with narrow benches, previously mined areas, trench mine applications and steep-dip seams.{{Citation needed|date=January 2021}}
[[File:Myslowice kopalnia Myslowice 07.jpg|thumb|upright|[[Mysłowice]] coal mine shaft tower, [[Upper Silesian Coal Basin]]]]