Durham Mining Museum
Broadbent Thomas 03 Aug 1911 aged 53 Collier Fall of roof Deceased was engaged at the coal face of an upbrow when a fall occurred between two slips The fall was nine feet by four feet by three feet seven inches thick and broke down three bars The bars
open pit mining and strip mining
Apr 30 2020 Open pit mining is used when you have to dig deeper for the ore Strip mining is used when the ore is closer to the surface Mountaintop removal is used in coal mining in Appalachian mountains It is a type of strip mining that removes the top of a mountain and pushes the waste into surrounding valleys.