Comminution is the process of crushing and processing ore into smaller particles, and can consume 50% or more of a mine’s energy. Several methods, using up to 4 stages, and varying degrees of automation are available. Comminution methods are also “ore-dependent”. According to “Mining[dot]com” “There is no magic design that is the best for all (comminution) circuits”. Generally, the more comminution upstream (in the initial stages) the better. However, the more stages involved, the more energy is consumed, resulting in an overall higher environmental cost. Therefore, the question asks: “Where does the bulk of the process occur: Upstream/in-pit, using High Pressure Grinding Rolls “HPRG” which may include “Pre-Screening” or is it spread along a multi-stage process? If the mine uses significant Upstream or In-Pit HPGR, ENTER “1” – If the mine is more reliant on Traditional “SAB” (Autogenous and/or Semi-Autogenous + Ball Milling) ENTER “2”. If the mine has a 3 – 4-stage process (Traditional + “Vertimill” or equivalent) with little to no HPGR, ENTER “3”.