The present paper shows the results of gamma-activation assay system development as well as its commissioning in a gold mining industrial complex. The system uses an electron accelerator with energy up to 8 MeV and flux power 5 kW. A precision two channel gamma- spectrometer based on multi-crystal HPGe detectors was used to register spectra emitted from the sample. The detection limit for gold in 15 s of measurements was 0.08-0.20 g/t depending on barium and hafnium content. The registration sensitivity for 1 g/t per 15 s of measurement time was 500-650 pulses. The weight of the analyzed samples is 500 +/- 70 g. The research results point to the capability to determine the concentrations of multiple associated elements in ore samples: Au, Ag, As, Ba, Br, Cd, Er, Ge, Hf, Hg, In, Ir, Lu, Pb, Pt, Rh, Se, Sn, Th, U, Y, W. The ore assay system has the capacity to perform analysis of over 120 gold ore samples per one hour period.