Encyclopedia
Stein
Matte: an intermediate product of pyrometallurgical processing of sulfide ores of non-ferrous metals, including precious ones, representing a mixture of iron sulfides with sulfides of non-ferrous metals
Source: "PRECIOUS METALS. TERMS AND DEFINITIONS. GOST R 52793-2007"
(Approved by the Order of Rosstandart dated December 24, 2007 No. 388-ст)