Exploration mineralogical-geochemical and geological-geophysical models of chromites deposits in Urals Mountains alpinetype ultrabasites
The example of analysis ofthe quality and reliability of detailed exploration works on the chromites ores, executed in 2003-2006 is shown. Works were spent for territory of a alpinetype ultrabasites massif Syum-Keu (east slope of Polar Urals Mountains). The received results have great value for the decision of a problem of residual resources of territory of the north of Urals Mountains for various minerals. The technology of an estimation of reliability of exploration systems is put in a basis of researches of quality and reliability executed before works. For each of methods quantitative modeling is executed: material-indicator and spatially-geometrical properties of final and intermediate objects of searches; influences on efficiency of works of landscape - geological conditions of environment; actually realized search networks (grids); systems of interpretation ofthe received data; technology of check of the allocated perspective sites and anomalies. Quantitative estimations of quality and reliability of searches on separate methods are incorporated in complex estimations - on several methods. It has appeared, that the probability of detection of commercially-valuable objects within the limits of obviously perspective fragments of a massif does not exceed 0,1, and the probability of the miss is close to 0,9. The received estimations allow to estimate natural reserves of chrome in a massif, at least ten times more exceeding designated to the present time