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Subsidence and roof movement incident to coal extraction
Longwall mining with roof subsidence and roof caving; conveyors reduce gate roads required and lead to adoption of caving methods which eliminate pack walls altogether; discussion of roof action and types of supports.
Subsidence and roof movement incident to coal extraction
Longwall mining with roof subsidence and roof caving; conveyors reduce gate roads required and lead to adoption of caving methods which eliminate pack walls altogether; discussion of roof action and types of supports.
Subsidence and roof movement incident to coal extraction
Min. Congress Jl
Claghorn, C.R. (author)
1928
Article (Journal)
English
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