Ann: Update on Historical Results from Mbengue Project, page-19

All those holes were drilled to 130 azimuth (SE) except for the last 4 holes and since the dip is interpreted to be 70 degrees to the SE there's only a small difference of about 15 degrees between the dip of the reef and the drillhole dip.

That means that the true width of the intersections will be about 25% of the downhole width, i.e. the gram-metre numbers need to be quartered. A lot less exciting now (and an expensive mistake) and good example of why you should figure out the dip with scissor holes early in the program.