The main task of phase analysis in the evaluation of minerals as objects of technological processing is to find out what minerals are represented and how quantitatively distributed between them valuable metal. No less important is the quantitative assessment of the useful component, which is in the state of fine dispersion in the host rock, or undesirable (harmful) impurity in the composition of the ore mineral itself. Often encountered in the practice of such studies various forms of interrelation of mineralogical components also need to be defined and quantitatively accounted for. Phase analysis also includes the question of the forms and degree of metal content of individual components of ore raw materials. Clarification of the material composition of fossils, even for relatively simple objects is done more often by applying chemical rational analysis. The question of the forms and degree of metal content of individual components of the ore is quantitatively solved also mainly by the chemical method of research. Chemical methods of determination of metal content allow to take into account also those components of the mineral, which contain in one or another form of valuable metal, but at the same time are not compounds of this metal. Quantitative assessment of the degree of metal content of such components complements the material composition of the object under study, correctly directs the direction of technological searches and allows to foresee the quality of concentrate and possible results of separation