core drilling will be conducted to produce maximum recovery with every reasonable precaution taken to prevent crushing, washing or grinding of the core. Core recovery as measured by volume recovered is paramount and the clients nominally require +90 percent recovery in mineralisation. The service provider will undertake to use triple tube core barrels and face discharge bits of PQ and HQ size to maximum recovery where require. The service provider will undertake to engage at its own cost the services of a mud engineer should the clients consider such action desirable.