Calculating true width from drill intercepts is a crucial process in the field of geology and mineral exploration, essential for accurately estimating the size and quality of mineral deposits. Drill intercepts, or the lengths obtained from drilling operations, often do not represent the true dimensions of a deposit due to the angle of the drill holes relative to the geological structures. This article will outline the methodologies used to convert drill intercept measurements into true widths, detailing the necessary geometric principles and providing practical examples. By understanding and applying these calculations, geologists and mining professionals can enhance their assessments of mineral resources, leading to more informed decision-making in exploration and development activities.
drill intercepts represent the lengths of mineralized material intersected by drilling; however, they do not always correspond directly to the true thickness of mineral deposits due to factors such as the angle of the drill hole in relation to the deposit.Understanding this discrepancy is crucial for accurate resource estimation and subsequent economic evaluations. The primary methodologies for calculating true width involve analyzing the angle of intersection through geometric considerations, where the true width (TW) can be defined using the formula: TW = Intercept Length × sin(α), with α being the angle of the drill hole relative to the horizontal plane. Accurate determination of this angle often necessitates geological and structural analysis of the deposit, and also the use of cross-sectional modeling to visualize spatial relationships.
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