LOGICAL INFORMATION MODELS OF GOLD ORE DEPOSITS FOR THEIR PREDICTION AND PROSPECTING IN THE ARCTIC ZONE

In recent years the rapid gold price increasing has been on the world market. It was the main reason for significantly increased demand for the precious metal even in the remote north-eastern regions of the Russian Arctic (Chukotka), where new mines were put into operation. Chukotka is the most gold-bearing area among the eastern provinces of Russia. It has the third place in the quantity of recoverable precious metal in our country. Historical mining of Chukotka gold is equal to 1018 tons, and about 1,300 tons of silver. In the gold mining of Chukotka the epithermal gold - silver deposits are dominated. The existing gold mineral resources will be worked out in the next 10-15 years after reaching the design capacity of new mines of Chukotka. Potential prospecting criteria of gold mineralization were defined, which are divided into geotectonic, magmatic, metamorphic, litho-stratigraphic, lithological, geochemical, structural, mineralogical, geochemical, hydrothermal-metasomatic, geochemical and geophysical. They were used for characterizing of etalon deposits. The procedure of logic-information analysis [1] on etalon (well-studied) deposits from database has designed for the selection of their informative features, which together can quantify the similarity measure between poor studied prospect areas and etalon deposits of studied type. In the case of positive result of the comparison it is possible to evaluate the size by analogy with designed models of small-, middle- and large-scale deposits. The results of the analysis of the existing database of gold-quartz and gold - rare-metal deposits of the North-East of Russia were used to construct decision rules of prediction expert system on evaluating prospective target areas and occurrences in similar geological conditions. The models system is based on a broad set of interrelated criteria and features and representative database of etalon gold - quartz and gold - rare-metal deposits in the North-East of the Russian Federation. It allows you to use it in the study and evaluation of this type deposits in similar ore-bearing provinces including the Russian Arctic zone.