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Establishing a vertical interval of mineralization is a complex geological   task based on the knowledge of many parameters and quantities that describe   the genesis of an ore deposit. It is particularly important to know the time   and the primary depth of the formation of an ore-body and its recent   position. The establishment of the vertical mineralization interval is   considered in this work on the example of the Alšar Sb-As-Tl mineral deposit.   The research methods used were geomorphological analysis (the principal   exploration method), measurement of cosmogenic radioactive (10Be, 26Al) and   stable (3He, 21Ne) nuclides to determine the erosion velocity (control   method) and comparison of the obtained results with the geological   exploration data from operative mine workings. A detailed geological study of   the formation of the Alšar deposit preceded the research. The research data   are the following: depth interval of the ore-body is 10-50 m below the   present ground surface; average level of erosion in the Alšar deposit area is   20-80 m over a period of 106 years (Ma), or about 100-400 m from the   beginning of the volcanic activity to the present day (≈5 Ma); thickness of   the eroded rock complex over the ore bodies from the beginning of the   hydrothermal alteration and the formation of ore bodies (4.31 Ma) to the   present is ≥150 m (Crven dol), or ≥230 m (central deposit); the   palaeointerval of the formation of the ore-body is 230 m (200-430 m); and,   finally, the potentially mineralized interval is deep, from 10 m to 280 m   below the surface

Vertical mineralization interval and forecast of the position of an ore-body in the Alsar Sb-As-Tl deposit, FYR Macedonia