By Friedrich-Wilhelm Wellmer
This absolutely up-to-date textbook is meant for the industrial geologist who offers with the evaluate of deposits at an early degree of improvement. It deals principles for speedy and straightforward calculations in keeping with the applying of approximate facts. It presents either the coed and the geologist within the box with a whole algorithm and techniques allowing them to accomplish a brief preliminary overview of the deposit with out the aid of experts or desktops – no matter if he's left to his personal assets. All ideas for calculations are illustrated with examples, and blunders and pitfalls the authors encountered in the course of their careers are pointed out.
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Example text
5 I point in assignment --- f--- field of non-retevance at I~ -j-+++fI® 5'" slgnHieance level I I ......... '" ........ t--.... i'j-o. 1 I r---: +-, number of data pairs Fig. 13. Minimum correlation coefficients at a significance level of 5% 39 We use Fig. 13. 63. At this chosen significance level the correlation is therefore not significant. 3 Calculating Metal Equivalents For deposits with several economic components, a metal equivalent is calculated as a rule to determine, for example, the cut-off grade (see Chap.
35 $/u. 40 $/t iron ore. b. mine (free on board, see Chap. 1) freight costs have to be subtracted. 2. Example. For scheelite concentrates the accepted price is 80 US-$/u W0 3. 80% W0 3. This ore has to be beneficiated first before yielding a saleable product. Recovery is assumed to be 85%. 40 US-$/t. As in the case of iron ore, freight costs should be considered. While freight costs contribute considerably to the purchase price of iron ore for the steel plants (iron ore is a low-value bulk product), this is not true for tungsten concentrates which are a high-value product.
Construction of equidistance lines 27 Flat (inclined) map w o -_.... ,-' 50 100m ....... ' ''--_ E o Drill holes with mineralisation below cut- off Fig, 7, Plan map for reserve calculation with blocks 28 Extrapolation from last drill hole 50m 4 Weighting and Grade Determination Grade determinations will only be dealt with in this book if the calculations involve simple weighting with for example assay intervals in drill holes or with reserve block volumes. Today sophisticated statistical and geostatistical methods are available to determine the grade of deposits or mining blocks.
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