A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Blasting no-cut-hole raise rounds using millisecond delays
Report on experiments conducted at Mt Weather, Va, experimental mine during driving of 6 by 10-ft ventilation raise through hard rock; drill round patterns varied from 28 to 32 holes and from V-cut design to one having no cut holes; 60% ammonia gelatin dynamite used; raise rounds break equally well with V-cut design or with no cut holes; fragmentation excellent but millisecond delay may cause greater timber damage. (see also Min Congress J n 7 July 1953 p 18-22)
Blasting no-cut-hole raise rounds using millisecond delays
Report on experiments conducted at Mt Weather, Va, experimental mine during driving of 6 by 10-ft ventilation raise through hard rock; drill round patterns varied from 28 to 32 holes and from V-cut design to one having no cut holes; 60% ammonia gelatin dynamite used; raise rounds break equally well with V-cut design or with no cut holes; fragmentation excellent but millisecond delay may cause greater timber damage. (see also Min Congress J n 7 July 1953 p 18-22)
Blasting no-cut-hole raise rounds using millisecond delays
U S Bur Mines -- Report Investigations
Russell, P.L. (author) / Agnew, W.G. (author)
1953
9 pages
13 supp plates
Article (Journal)
English
© Metadata Copyright Elsevier B. V. All rights reserved.
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