Prf methannb
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Prf methannb






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  • Sources Russes
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Prf methannb Prf methannb Presentation Transcript

  • Parameters of mining method evaluation What we are looking for choosing the mining method This objectives are contradictory Maximum recovery of reserves recovery characteristics Maximum daily tonnage for productivity characteristics minimum stopes in operation Minimum cost consumption and economic characteristics Under good security conditions
  • Recovery characteristics : sources of dilution and loss Loss in pillars Loss and dilution on irregular ore/waste contacts Dilution when stope opening is larger then ore thickness Loss on irregular footwall Loss and dilution on the working surface during the loading Loss and dilution during extraction under caving waste minerai remblai
  • Recovery characteristics : dilution and losses ore waste waste Recoverable reserve R dilution S losses P
  • Direct calculation of dilution and loss R - recoverable reserve, t R =10000 t P - loss, t P = 900 t S - dilution with waste, t S = 1600 t TV - run of mine tonnage, t TV = R - P + S = 10000 - 900 + 1600 = 10700 t t R - average grade of metal in recoverable reserve, t R = 0,08 t P - average grade of metal in loss, t P = 0,11 t S - average grade of metal in waste (dilution), t S = 0,015 t TV - average grade of metal in run of mine, t TV = (R * t R - P * t P + S * t S )/TV= (10000*0,08 - 900*0,11 + 1600*0,015)/10700 = 0,068 metal ore
  • Indirect calculation of dilution and loss Loss of ore Dilution Loss of metal
  • Dilution and loss optimisation
  • Dilution
  • Losses
  • Productivity characteristics Stope output : tonnes per stope and per month Relative weight of development : metrage of drifts par 1000 t of recoverable ore percentage of development in cost of a tonne of ore Productivity of personnel : tonnes per man and per shift tonnes per man and per year Level of mechanization : percentage of labor in costs
  • Stope output
  • Relative weight of development
  • Productivity of personnel Mine personnel : totale, underground, stope
  • Productivity of underground personnel
  • Level of mechanization
  • Powder consumption
  • Relative operating cost of mining methods compared with room and pillar mining Operating cost of room and pillar mining vary between 2 et 27 $/t with country, it’s 14,5 in average