Encyclopedia Americana, Količina 19Americana Corporation, 1965 |
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Zadetki 1–3 od 85
Stran 163
... rock contains one or more phos- phates , usually calcium phosphate , in sufficient quantity to permit manufacture into soluble phos- phate fertilizers and other phosphatic products . The rock occurs in a variety of forms , including ...
... rock contains one or more phos- phates , usually calcium phosphate , in sufficient quantity to permit manufacture into soluble phos- phate fertilizers and other phosphatic products . The rock occurs in a variety of forms , including ...
Stran 174
... rock such as limestone , marble , or slate . The Anaconda Company A typical open - pit mine is terraced with shelves , or benches , to permit ease of working and ore removal . Open - Pit Mining . - Open - pit mining is begun by breaking ...
... rock such as limestone , marble , or slate . The Anaconda Company A typical open - pit mine is terraced with shelves , or benches , to permit ease of working and ore removal . Open - Pit Mining . - Open - pit mining is begun by breaking ...
Stran 175
... rock from falling , various types of supports such as timber and rock bolts are required . To protect him , the miner needs special clothing and equipment . Only after these things are provided , can the miner proceed to the stope to ...
... rock from falling , various types of supports such as timber and rock bolts are required . To protect him , the miner needs special clothing and equipment . Only after these things are provided , can the miner proceed to the stope to ...
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