GANG n.
The mineral substance which incloses a vein; a matrix; a gangue. Gang board, or Gang plank. (Naut.) (a) A board or plank, with cleats for steps, forming a bridge by which to enter or leave a vessel. (b) A plank within or without the bulwarks of a vessel's waist, for the sentinel to walk on. -- Gang cask, a small cask…
SCORIFY v.
To reduce to scoria or slag; specifically, in assaying, to fuse so as to separate the gangue and earthy material, with borax, lead, soda, etc., thus leaving the gold and silver in a lead button; hence, to separate from, or by means of, a slag.
SPAR n.
us; as, calc spar, or calcite, fluor spar, etc. It was especially used in the case of the gangue minerals of a metalliferous vein. Blue spar, Cube spar, etc. See under Blue, Cube, etc.