MODELING OF TERRIGENOUS COLLECTORS AND ASSESSMENT OF FORECAST RESOURCES OF PLACER DIAMOND POTENTIAL ON KHANNINSKY SITE WITH THE MINING-AND-GEOLOGICAL INFORMATION SYSTEM (GGIS) MICROMINE

Khanninsky site is located within Dyakhtarsky ore placer zone and represents a cone of kimberlite minerals carried out from Nyurbinskaya pipe.The purpose of our work was to create 3D models of productive thicknesses of Khanninsky site with GGIS Micromine, calculation of expected resources and comparison of the obtained data with the resources estimated manually.Modeling of frameworks of suites on this area is carried in GGIS Micromine by three ways: manual, modeling of a stratigraphy of the layer and conditional modeling of a sole and roof of suites with the use of RBF. The most reliable and exact frameworks of productive suites were received by modeling of the stratigraphy of the layer.Key parameters of assessment of expected resources are as follows: area, depth of the forecast and maintenance of useful components. The productive layer on the site is localized in deposits of Dyakhtarsky and Ukugutsky suites. For assessment of the resources, we assumed the average content of diamonds, taking into account the volume weight, as 0.61 carats/m3, the land area - 11.605 km2, the layer thickness - 3.99 m.The assessment of forecast resources was carried out by three ways: 1) using the placer contour in the plan, with a constant thickness of 3.99 m, the forecast resources made 28,467.97 thousand carats; 2) using the framework of productive thickness, whose sole was constructed by modelling the layer stratigraphy and duplicated at the mean thickness value of 3.99 m, P1 resources made 25,604.81 thousand carats; 3) using the framework taking into account geometry of the productive layer delineated on cuts according to approbation, forecast resources made 44,596.61 thousand carats, which gives an increase in resources of 16,120 thousand carats compared to the manual calculation.

forecast resources, layer stratigraphy, buried placer, cuts, contours, frameworks, modelling, productive layer

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