About The Name
In geostatistical theory, the standard symbology adopted by the Centre of Geostatistics in Fontainebleau (École Nationale Supérieure des Mines de Paris) for denoting “grade” is the letter z. The lower case z denotes the grade of samples whereas upper case Z denotes the actual grade of a block. To distinguish the estimate of a block grade from the actual, a superscript star is added; Z*. In other words Z* denotes the estimated grade of a block. A core function of Z Star Mineral Resource Consultants (Pty) Ltd is the application of geostatistical techniques to estimate block grades, hence the choice of name.