![]() The first makes use of structure contours. From the intercept data, there are three ways of calculating the strike and dip. Where three separate holes intersect the same marker bed, they provide three points of known position on that surface. The attitude of any plane is fully defined if the position in 3D space of three or more points on that surface is known. The need to determine the strike and dip of a planar structure from a number of drill intersections is one that occurs very frequently – this is often called the three-point problem and every geologist should be familiar with the simple solutions to it (Marjoribanks, 2007). In this post, techniques for collecting orientation data on planes are described when more than one non-oriented hole is available from a prospect. In a previous post (see here) I described how quantitative orientation data can be collected from from a single drill hole, even where the core is not oriented. ![]()
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