(f) polymetallic sulphides means hydrothermally formed deposits of sulphide minerals which contain concentrations of metals including, inter alia, copper, lead, zinc, gold and silver

There are more stages involved here than I've got time to tell you about, but basically we drive through the space, we populate it with environmental variables sulphide, halide, things like that.

(b) the estimation of mineable deposits, when such deposits have been identified, which shall include details of the grade and quantity of the proven, probable and possible (polymetallic sulphide) (cobalt crust) reserves and the anticipated mining conditions