Titlebook: Statistical Evaluations in Exploration for Mineral Deposits; Friedrich-Wilhelm Wellmer Textbook 1998 Springer-Verlag Berlin Heidelberg 199

Kidnap

Skewed distributions Thus, higher grades occur in addition to the average grade tenor, and they extend beyond the range considered as the normal distribution. These irregularly high values or enrichments frequently convert mineralisation into orebodies.

Observe

Repatriate

披肩

Geostatistical Calculationsfrom drill holes or channel sample values, are statistically independent of each other. This condition is satisfied by, for example, the throwing of a die; if a six is thrown, then the chance of the next throw being another six is exactly the same as if a one, or any other number between a one and a

arrhythmic

Further Statistical Considerations for Evaluating Mineral Depositsve established a number of statistical factors derived over years of experience, and these factors should be taken into consideration. It is naturally assumed that “our” mining company would do a better job of mining the deposit as compared to the current owner, but that is rarely the case during th

水獺

Bias in Reserve Calculationse incorporated into the computations. One is often unaware that this might have happened. In the example of a lateritic nickel deposit, as described in Chapter 4.1 (Economic Evaluations in Exploration), a bias to higher nickel grades was caused by incorrect weighting.

LUMEN

PSA-velocity

Defining an Exploration Gridations in Exploration, Chap. 10). The definition of the grid for the subsequent geochemical and geophysical exploration represents the first step into exploration statistics. Initially, however, before any statistics are taken into consideration, all the geological information must be fully compiled

thwart

Determining Anomalies from Geochemical Exploration Datad statistically by the lognormal distribution (Chap. 9). As already mentioned, the high and therefore potentially anomalous values are usually the objectives of exploration geochemistry. These values contrast clearly compared to the remainder, and can therefore provide the first indications for the

JOT

Other Methods for Defining Anomaliesefined and obvious anomalies but also those anomalies that are relatively weak with respect to the background noise. In addition, filter techniques can be, and are, used for geochemical exploration since the geochemical analytical data are usually spatially interdependent, or regionalised variables