High resolution continuum source atomic absorption spectrometer ContrAA-700 with graphite furnace is used for direct gold determination in rocks and ores on the level 10-6-10-3 % mas. Russian standard reference materials of gold containing ore СЗР-4 (2.13 ± 0.05 g/ton), black slates of Sykhoy Log СЛг-1 (2.50 ± 0.03 g/ton) and СЧС-1 (0.10 ± 0.02 g/ton) in mass 1 mg was inserted into the furnace in the suspension form prepared on the mix of concentrated HNO3 and HCl (1:3) with following sevenfold dilution by water. It was revealed that spectral lines of gold have dense fine structured spectral interferences of different molecules of the matrix. Absorption resonance line Au 242.8 nm is overlapped by left wing of very intensive SiO band. Twice ...