2-D and 3-D Trend Analysis - Geomathematics: Theoretical Foundations, Applications and Future Developments - page 245

0 50 100

13500N

FEET

13400N

1.0

0.25

13300N

13200N

14000E 14200E 14400E 14600E

Fig. 7.8 Mosaic of exponential quadratic trend surfaces for copper concentration value on the 425-ft. level of Whalesback Mine; based on underground borehole
data; drill-holes were north-south oriented, approximately 50 ft. apart; western boundary coincides with drill-hole No. 2 (Source: Agterberg 1974 , Fig. 48)