INFERRED RESOURCES OF CARBONACEOUS DEPOSITS IN THE AMUR STRATIFORM DEPOSITS FOR TUNGSTEN

The article describes the geological structure of the Amur stratiform zinc deposit, including ore-bearing flysch and overlying volcanic strata, the position of the sulfide ore body in geological section. Given the fact that a large part of the main ore body lies among carbonaceous deposits, in the latter by means of thermal analysis was estimated the degree of metamorphic change with the introduction of large Suunduk granite massif, as well as the study of content in them tungsten. Rare metal specialty of granite was previously proved by works of many researchers. We found that the ore-bearing carbonaceous shales contain industrial concentration of tungsten. In some cases they reach hurricane levels (up to 2200 g/t). However, analysis of the results of studies of black shale formation showed a high content of tungsten only in the eastern, closest to Suunduk massif, part of the geological allotment, but west of the boundary of the amphibolite and greenschist metamorphism facies, that we have identified according to thermal analysis. This allowed us to identify the promising area within which an attempt was made to estimate inferred resources of tungsten by category P 2 . The main parameters for calculation of resources are the average content of metal in carbonaceous deposits and the average thickness of the ore zones, which were calculated on the basis of data sturry and furrow samples. The result is a medium-scale object with resources of about 5 thousand tons of tungsten. It is known that zinc ore of Amur deposit currently classified as off balance ore, uneconomical to develop. However, given the estimated inferred resources of such an important associated metal such as tungsten in ore-bearing carbonaceous shales, the field may be attributed to the group of complex and ore to balance.