By Gunter B. Fettweis
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Additional info for World Coal Resources: Methods of Assessment and Results
Sample text
Fig. 5 gives a diagrammatic and purely qualitative presentation of this dis tribution. In accordance with that we have said so far in this chapter, a to tally different picture results from as in the case of the raw materials of in organic origin. The predominant part of the earth's crust is completely free of organogenic carbon. Only a part of the sediments has a finely distribut ed low grade content. Coal occurrences form a sub-group of higher grades that is entirely separate. In principle, the sub-group of coal occurrences can also be subdivided ac cording to its size, as has been done for the complete group of raw material resources of inorganic origin in Fig.
In contrast with the conditions in extraction activities, there are scarcely any obstacles within the spectrum of quality in which the predominant mass of coal occurrences lie that are insuperable in the field of beneficia tion, in other words in particular the extensive sorting out of incombustible mineral constituents. Certain impure coals, for instance in South Africa, may be an exception. Accordingly, the question concerning the extent to which the impurities of a raw produced coal can still be removed is virtual ly exclusively of an economic character.
I. frequently found in the eastern USA or in South Africa, and folded and more disturbed occurrences as often found in the Ruhr, in the Ukraine or in the western USA and Canada. At the same time the first category includes mostly lesser depths than the second. An exam ple of the two types is shown in Fig. 7 by occurrences in the Soviet Union (20). Only the major disruptions, due to the scale of this illustration, which are usually accompanied by numerous phenomena of the same kind on a smaller scale, can be shown.