Download Economic evaluations in exploration by Friedrich-Wilhelm Wellmer PDF

By Friedrich-Wilhelm Wellmer

The textbook is meant for the commercial geologist who offers with the assessment of deposits at an early degree of improvement. It deals principles for fast and straightforward calculations in accordance with the appliance of approximate info. It presents either the coed and the geologist within the box with an entire algorithm and strategies allowing them to accomplish a brief preliminary evaluate of the deposit with no the aid of experts or pcs – whether he's left to his personal assets. To aid the "how to do"-approach all principles for calculations are illustrated with examples and in addition issues out error and pitfalls the authors encountered in the course of their careers. The case histories, workouts, steel costs and terminology, in particular touching on "reserves and resources", were totally up to date during this moment version. New chapters speak about themes together with the lifestyles time of deposits, derivation of rates of interest for the web current price (NPV) calculations, the effect of political hazard and the overview of mineral clients with no identified mineralization.

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Strictly speaking, uranium itself does not emit detectable amounts of gamma radiation. The gamma radiation is caused by the decay products of uranium, principally bismuth-214. In radiometric surveys, one assumes that the daughter products of the decay are in equilibrium. If this is not the case, one has to work with correction factors (see below Sect. 4 where correction factors are discussed). The procedure of determining uranium grades from gamma radiation cannot be used if other strong gamma emitters like thorium or potassium are present in significant amounts.

In this case, each individual component has to be weighted separately as shown in Sect. 1. 1 Metal Ratios To show zoning in ore deposits, for example in isoline maps, frequently metal or element ratios are used. g. the Au:Ag ratios in Au-deposits. In most deposits this ratio varies between 2 : 1 to 10 : 1. If the ratios have a large spread, it is helpful to use a standardization procedure. 1 shows a list of Pb- and Zn-values of a Pb/Zn-deposit. If one uses Pb/Zn or Zn/Pb ratios, a large range has to be dealt with, which is difficult to handle on the normal scale of an isoline map.

We are dealing with a steep vein which, for technical reasons, has to be mined at a minimum thickness of 1 m. In the vein a massive stibnite shoot occurs. How many percent antimony correspond to a band of 1 cm stibnite? 6 g/cm3. 7% Sb. We assume 70%. The thickness of the massive stibnite band has been measured at intervals of 1 m. We consider a vein surface of 1 m2 and a mining width of 1 m. 1. 2 · Grade Estimation and Weighting Fig. 7. Graph for conversion of massive ore thicknesses (here, stibnite) 2.

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