dterminacion de la ley general del mineral
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Publicado: 16 de mayo de 2015
6.4.4. Determination of Overall Stripping Ratio:
Is calculating the potential return on a surface mining venture, the overall stripping ratio is more important than the maximum stripping ratio. Wemust therefore also calculate the overall stripping ratio for a given cross section or for the entire mine. In our case, we may now want to determinate SR0 for a cross section where we have alreadycalculated SRmax .
Referring to the general case in figure 6.7, the total volume of overburden V in yd3 is found trigonometrically as:
V = (6.11)
Similarly, the total weight of ore W in tons(tonnes) is:
W = (6.12)
Therefore, the resulting expression for overall stripping ratio in yd3/ton is:
SR0 = = (6.13)
Note that Eqs. 6.11 thought 6.13 must be altered slightly toproduce answers in m3/tonne. Eq. 6.13 ignores the area (A) in Figure 6.7a. To correct the volume of ore removed, that area must be calculated trigonometrically and added to W.
FIGURE 6.7a: Geometricrelation of pits parameters and SRmax at pit limit. Cross section thought ore body and overburden.
The configuration of surface mines used here is simplified to illustrate the stripping ratioprinciples. In practice, the cross sections will not normally consist of simple geometric figures. Therefore, most of the cross sections must be analyzed using area determinations that are more sophisticatedthan those demonstrated here. For many years, engineers performed their volume calculations using polar planimeters (area measurement devices). Today they have software programs and digitizingequipment that perform the same function mathematically in less time and with more reliable results. These calculations are now routinely performed by computer systems that determine pit limits. Calculatereserves, perform pit planning, and estimate grades and costs.
6.4.4. DETERMINACIÓN DE LA LEY GENERAL DEL DESMONTE:
Es el cálculo del rendimiento potencial de una empresa de...
Is calculating the potential return on a surface mining venture, the overall stripping ratio is more important than the maximum stripping ratio. Wemust therefore also calculate the overall stripping ratio for a given cross section or for the entire mine. In our case, we may now want to determinate SR0 for a cross section where we have alreadycalculated SRmax .
Referring to the general case in figure 6.7, the total volume of overburden V in yd3 is found trigonometrically as:
V = (6.11)
Similarly, the total weight of ore W in tons(tonnes) is:
W = (6.12)
Therefore, the resulting expression for overall stripping ratio in yd3/ton is:
SR0 = = (6.13)
Note that Eqs. 6.11 thought 6.13 must be altered slightly toproduce answers in m3/tonne. Eq. 6.13 ignores the area (A) in Figure 6.7a. To correct the volume of ore removed, that area must be calculated trigonometrically and added to W.
FIGURE 6.7a: Geometricrelation of pits parameters and SRmax at pit limit. Cross section thought ore body and overburden.
The configuration of surface mines used here is simplified to illustrate the stripping ratioprinciples. In practice, the cross sections will not normally consist of simple geometric figures. Therefore, most of the cross sections must be analyzed using area determinations that are more sophisticatedthan those demonstrated here. For many years, engineers performed their volume calculations using polar planimeters (area measurement devices). Today they have software programs and digitizingequipment that perform the same function mathematically in less time and with more reliable results. These calculations are now routinely performed by computer systems that determine pit limits. Calculatereserves, perform pit planning, and estimate grades and costs.
6.4.4. DETERMINACIÓN DE LA LEY GENERAL DEL DESMONTE:
Es el cálculo del rendimiento potencial de una empresa de...
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