(1) Processed minerals are any of the following:
(a) materials resulting from * minerals treatment of * minerals or quarry materials (except * petroleum);
(b) materials resulting from sintering or calcining;
(c) pellets or other agglomerated forms of iron;
(d) alumina and blister copper.
(2) Minerals treatment means:
(a) cleaning, leaching, crushing, grinding, breaking, screening, grading or sizing; or
(b) concentration by a gravity, magnetic, electrostatic or flotation process; or
(c) any other treatment:
(i) that is applied to * minerals, or to quarry materials, before that concentration; or
(ii) for a mineral or materials not requiring that concentration, that would, if the mineral or materials had required concentration, have been applied before the concentration;
but does not include:
(d) sintering or calcining; or
(e) producing alumina, or pellets or other agglomerated forms of iron, or processing connected with such production.