ORE OCCURRENCES IN THE ANABAR PLACER REGION AS POTENTIAL INDIGENOUS SOURCES OF GOLD

Abstract

The article presents the results of field and laboratory researches. The goal of the researches was to define potential indigenous sources of gold in the Anabar placer region. The absence of identified primary ore sources of fine grained alluvial gold, widespread in the study area, determine the relevance of the work at the moment. The main task of the research was to study the mineralogical characteristics of the occurrences of disseminated gold-sulfide ores found in the different age strata of the Anabar Shield, its eastern, south-eastern borders and nearby areas. In addition, a complex of typomorphic features of placer gold was studied to determine the relationship with the ore occurrences. The solution of the problems was carried out by the generally accepted methods of the rocks and minerals studying: the mineralogical analysis, petrographic and mineragraphic studies. It was discovered that all the investigated ore occurrences have been formed within the deep fault zones and are associated with metasomatic alteration. Positive factors of ore deposition were for certain areas. These factors include the distributionzones of mylonites and cataclasites, as well as permeable fault zones with tectonic fracturing of carbonate rocks. Based on the discovered indicator typomorphic features of placer gold in the region, the relationship of the placer gold with the examined ore occurrences was revealed.