Ore Mining Methods: Comprising Descriptions of Methods of Support in Extraction of Ore, Detailed Descriptions of Methods of Stoping and Mining in Narrow and Wide Veins and Bedded and Massive Deposits Including Stull and Square-set Mining, Filling and Caving Methods, Open-cut Work and a Discussion of Costs of Stoping
J. Wiley, 1910 - 219 pagina's
Wat mensen zeggen - Een review schrijven
We hebben geen reviews gevonden op de gebruikelijke plaatsen.
Overige edities - Alles weergeven
advantage amount angle applicable arch beginning begun breaking broken carried cars caving chutes close comparatively connecting considerable considered cost cross-cuts danger deposits disadvantages distance district drawn drifts drills driven Elements employed Engineering especially extending extraction face falls feet filling floor foot foot-wall formed ground hand handling hard height inclined increased intervals labor lagging Large 12mo latter less levels limited loaded lode lower maintained Materials Mechanics method of mining milling mineral moderately narrow necessary opened operations output overhand stoping owing pillars placed Plan portion possible posts practically raises range reached readily removed resulting rock roof sets shaft shovel shown side similar space square-sets standing stoping strong stulls sub-drift subs surface thickness timber underhand stoping upper usually various vary veins vertical walls waste Water wide width winzes