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Method used by Consolidated Coal Co (Ky) to hold roof in Elkhorn No 3 seam; roof is weak structure without definite flat laminations, and after exposure, loosens to heights where bars will not support it and it has to be taken down; supporting roof by bolts was started and resulted in greater safety, increased production and lower costs.
Method used by Consolidated Coal Co (Ky) to hold roof in Elkhorn No 3 seam; roof is weak structure without definite flat laminations, and after exposure, loosens to heights where bars will not support it and it has to be taken down; supporting roof by bolts was started and resulted in greater safety, increased production and lower costs.
Roof bolting in Elkhorn No. 3 seam
Coal Min
Siniff, L.D. (author)
Coal Mining ; 26
1949
Article (Journal)
English
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| Engineering Index Backfile | 1953
| Engineering Index Backfile | 1952
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| Engineering Index Backfile | 1950