E/MJ : engineering and mining journal . PIG l Area of face Area high Total length sampleTotal length highTotal length Average value by sample. $43 Error ?1: 1016 ENGINEERING AND MINING JOURNAL Vol. 102, No. 24. the entire area of the face is cut down—obviously quiteimpracticable. The next most dependable sample wouldbe one of the muck broken down by a round of holes cover-ing the entire face. A careful sample of the muck shouldbe more reliable than any ordinary cut sample. I think,as a general rule, where both muck samples and cutsamples are taken, more reliance is likely to be placed,u
E/MJ : engineering and mining journal . PIG l Area of face Area high Total length sampleTotal length highTotal length Average value by sample. $43 Error ?1: 1016 ENGINEERING AND MINING JOURNAL Vol. 102, No. 24. the entire area of the face is cut down—obviously quiteimpracticable. The next most dependable sample wouldbe one of the muck broken down by a round of holes cover-ing the entire face. A careful sample of the muck shouldbe more reliable than any ordinary cut sample. I think,as a general rule, where both muck samples and cutsamples are taken, more reliance is likely to be placed,unjustly, on the cut sample. Fig. 2 is another example illustrating the same the shaded portion is high-grade ore running $100per ton, while the light area A is ore of $10 grade. In thiscase the actualaverage value of Ythe face is $ the sample ?gives $, an :error of $, or From acasual inspectionof Fig. 2 thesampling looksquite fair ultimate de-gree of accuracyobtained in sam-pling along ad rift in thismanner dependsupon the law ofaverages; somesamples will betoo high, otherstoo low. Thereis a probability that the sampler will oversample ratherthan un
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
