Probability and Statistics - Geomathematics: Theoretical Foundations, Applications and Future Developments - page 69

Fig. 2.9 Schematic representation of channel sampling in Pulacayo Mine. Successive channel
samples along horizontal mining drift on 446-m level were 1.3-m long and 2-m apart. The Tajo
vein, which is 0.5-m wide on average, consists of massive sulphide (hatched pattern) but wall rock
on both sides of the vein contained disseminated sulphide and stringers of sulphide ore. Antici-
pated stoping width was 1.3-m but effective channel width was ( L ) was set equal to width of vein
(¼0.5 m). Lag distance ( h ) is 2 m or multiple of 2 m (Source: Agterberg 2012 , Fig. 4)

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0 40 80 120 160 200 240

Distance, m

Fig. 2.10 Pulacayo Mine zinc concentration values for 118 2-m channel samples along horizontal
drift samples (see Table 2.4 for original data from de Wijs 1951 ). Sampling interval is 2 m.
“Signal” retained after filtering out “Noise” (Source: Agterberg 2012 , Fig. 1)