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Der Vorlauf an Lagerstättenvorräten mineralischer Rohstoffe. Eine geologisch-okonomische Kategorie. (L'évolution des réserves des minerais. Un problème d'économie géologique)
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The advance of deposit reserves of mineral raw materials expresses the ratio between the quantitative extent of reserves explored and their annual requirement due to the mining of a deposit. The advance of reserves as a geological-economic category