Pertaining to an igneous rock containing more than 66 per cent
silica. Change in the mineralogical composition of a rock,
commonly brought about by reactions with hydrothermal solutions.
anomaly / anomalous An occurrence of geochemical or geophysical
values distinct from background levels which may be caused by
the presence of mineralization. Metal associated with certain
types of gold deposit, chemical symbol Sb. Metal associated with
certain types of gold deposit, chemical symbol As. An iron-
arsenic sulphide, chemical composition FeAsS. A chemical test
performed on a sample of ores or minerals to determine the
amount of valuable metals contained. bankable feasibility study
An extensive technical and financial study to assess the
commercial viability of a project, of sufficient detail and
integrity that it can be used to arrange project financing.
Generally non-ferrous, non-precious metal, mainly copper, lead,
zinc, nickel and aluminium. The use of bacteria to oxidise
sulphide minerals. A rock fragmented int