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The investigated lead - zinc ore panel is located in the Blaznei Valley ore deposit, Romania. Applying traditional methods for determining the average thickness proves useful in its exploration, although there are only four points of thickness measurement, located in each corner of the exploration panel. Later, in the second stage of the exploitation process (preparation), when the exploration panel becomes an operating (exploitation) panel by contour mining of four workings, two groves on direction and two runs, ...