Vol. 328 No. 3 (2017)

The method of appletree as prospecting criteria of the gold mineralization

The relevance of the research is caused by the necessity to increase the efficiency of geological exploration works at the gold ore using the complex of forecasting and prospecting criteria and characteristics. The aim of the research is to study the magnetic susceptibility of rocks and ore deposits of the Chertovo Koryto by the method of magnetic susceptibility measurements and comparison of the obtained results with the character of distribution of gold and its trace elements to develop the petrophysical prospecting criteria of gold mineralization. Research methods: study of petrophysical properties of rocks and ores, mathematical processing of the results and interpretation of geochemical and petrophysical data. Results. It was found out that the values of magnetic susceptibility for arkose inequigranular and fine-grained sandstone, siltstone and mudstone rocks of Mikhaylovskaya suite (PR1mh) metamorphosed to the epidote-amphibolite facies varies within 0,009...0,359x10-3 units SI. It is shown that magnetic susceptibility (x) in the volume of the mineralized zone of the deposit Chertovo Koryto is caused by the ferrimagnetic pyrrhotite, crystallizing in the monoclinic system. The mineralized zone of the deposit is geometrized by the values of x>1x10-3 units SI according to the data of magnetic susceptibility measurements of rocks and ores. It was ascertained that there is a strong spatial (Au, As, Co, Ni) and correlation (Cu and Ag) relation between the elements distribution and magnetic susceptibility of rocks and ores, the high contrast gold halos are spatially separated with abnormal halos of magnetic susceptibility. Probably the latter is caused by the lack of gold in quartz-rutile-apatite-pyrite-pyrrhotite mineral complex and dissociated distribution of pyrrhotite and gold in quartz-pyrite-arsenopyrite-pyrrhotite with gold and quartz-polymetallic and gold producing mineral complexes. The developed petrophysical forecasting and searching criteria of gold mineralization can be successfully applied in the potentially mineralization type areas.

Keywords:

mineralized zone, deposit, magnetic susceptibility, geochemistry, ore elements, gold

Authors:

Roman Yurievich Gavrilov

Ekaterina Andreevna Sinkina

Sergey Nikolaevich Mitsykh