a. Correction made when drilling running ground, alluvial gravels, and sands. The volume actually extracted over a measured depth is compared with that which would be obtained over the true drill pipe area and distance, any discrepancy being due to inrush of sands or forcing out of sand by the pumping action during drilling. Pryor, 3
b. The assumed cross-sectional area of a length of borehole when estimating the in situ volume of a core sample. Also called pipe constant. Nelson
Source: Dictionary of Mining, Mineral, and Related Terms












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