Diamond Core Drilling

A borehole is surveyed to obtain a locational path of the borehole so that all other information obtained for the borehole (lithology, structure, geophysics, mineralisation, end point) can be accurately located and therefore provide the best information for later critical processes such as further drill planning, reserve planning/financial planning. It is also essential where knowledge of the borehole location is critical such as in engineering, tunneling and quarrying (blast holes).

Despite what drillers may say all holes deviate (that is, curve – or spiral – away from a straight line). The exact deviation depends on a number of factors: rock type, drill rig type/power, drill rods used, driller techniques are the more important ones, and will not be the same between holes.