Известия Томского политехнического университета: Инжиниринг георесурсов (Oct 2018)
Methodical aspects of forecasting and prospecting for largexvolume gold deposits on the example of the Yenisei ridge
Abstract
The relevance of the research is caused by the need of study and involvement of a new large-volume gold deposits in production. This can be contributing to the establishment and long-term development of whole regions of Russia. The main aspect is the engineering of a new and improvement of existing methods for prospecting gold deposits. The main aim of the research is the approbation of the methodology for prospecting gold deposits in difficult mountain-taiga landscapes applied to the conditions of the Yenisei Ridge, in particular, within the poorly known eastern part of this region, as well as identification of forecasting and prospecting criteria and features of newly discovered gold ore occurrence Bureminskoe, and their comparison with those of the known large-volume gold-sulfide Olimpiadninskoe deposit. Methods: analysis of literary and fund data; forecasting construction to determine prospecting areas for identifying a large-volume gold mineralization; development of new and improvement of existing methods and techniques for prospecting gold deposits; application of these methods in practice (lithochemical sampling for secondary dispersion halos of different levels of the cross-section of eluvial-deluvial sediments, schlich and point sampling; laboratory and analytical research (semiquantitative spectral analysis for 26 elements, chemical spectral analysis for gold). Results. The authors have detected a new ore-controlling zone of fold-discontinuous deformations of the gold ore occurrence Bureminskoe. It is confined to the zone of faults of the north-north-west orientation, fledging to the Ishimbinsk fault system, at the junction of their articulation with faults of the NE direction. A several gold-bearing mineralized zones within the cleavage zone are detected by a complex of schlich and lithochemical sampling for secondary dispersion halos of the informative low-shifted horizon of eluvial-deluvial sediments. The gold-bearing mineralized zones are represented by zones-deposits of disseminated gold-sulfide mineralization localized in intensely iron-magnesian-carbonatized carbonaceous carbonate-quartz-sericite schists of the Uderey sediments of the Sukhopitsk series of the Middle Riphean. The forecasting and prospecting criteria and features for gold mineralization of the ore occurrence Bureminskoe are identified. The primary poor disseminated gold-sulfide ores of the Olimpiadninskoe deposit are the closest analogue of the ore occurrence Bureminskoe. The authors compared the main geological elements of the ore occurrence Bureminskoe with disseminated gold-sulfide ores of Olimpiadninskoe deposit.
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