A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
System consists of 224 barrier pillars that affect 60 mines, have total length of 171 mi, and confine 34 underground pools, which contain 21 billion gal of water; gravity drainage tunnel would extend life of basin up to 100 yr and allow recovery of 65 million tons of coal tied up in barrier pillars.
System consists of 224 barrier pillars that affect 60 mines, have total length of 171 mi, and confine 34 underground pools, which contain 21 billion gal of water; gravity drainage tunnel would extend life of basin up to 100 yr and allow recovery of 65 million tons of coal tied up in barrier pillars.
Barrier pillars in Wyoming basin, northern field
U S Bur Mines -- Bul
Ash, S.H. (author)
1954
250 pages
7 Maps in pocket
Report
English
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Barrier pillars in Lackawanna Basin, northern field, anthracite region of Pennsylvania
| Engineering Index Backfile | 1952
Barrier pillars in southern field, anthracite region of Pennsylvania
| Engineering Index Backfile | 1953