Stream Sediments and Bleg Analysis by Prospecting of Goldin Alshar (Carlin Type Deposit), Macedonia

During the process of prospecting for gold aggregates in the stream sediments that are adjacent to the ore bodies in the Alshar deposit (Carlin Type), it was established that the content of this metal is much lower in the sediment materials compared with its concentration in the ores. This fact, as well as the high content of Au in the ore bodies and the assumption ofpre~ious researchers for the small size of the gold (about and less than I ILm), enable to conclude that gold aggregates are not concentrated in the stream sediments which are closely located to the ore bodies, but are rather transported along the lower course of the streams. Therefore, the broadly applied methods ofprospecting for gold deposits by analyzing stream sediments should be considered ineffective for the Alshar deposit,· and probably for other deposits of the Carlin Type. The statistic processing (cluster analysis) of the element associations in the stream sediments confinns the presence of a number of typomorphic minerals for the ores, as well as the relation of Au with Sb and Te. This gives good grounds to expect gold tellurides in the deposit ores.