Maximum Likelihood, Lognormality and Compound Distributions - Geomathematics: Theoretical Foundations, Applications and Future Developments - page 98

Fig. 3.13 (a). Two frequency distributions that depart from the lognormal model plotted on logarithmic probability paper. Example of 1,000 from Merriespruit
gold mine is after Krige ( 1960 ). (b). Method of Fig. 3.12 resulted in two types of F ( x ), the one for the Merriespruit Mine is approximately a straight line that
would intersect the X -axis at a point with abscissa of about 55 (value used in Fig. 3.11 for the same data set). Function F ( x ) for Muskox copper values would

suggest a change in the generating process after 0.5 % Cu (Source: Agterberg 1974 , Fig. 34)