Geophysical criteria for the separation of productive micaceous veins of the Mariinsky emerald-beryllium deposit (the Middle Urals)

Abstract

Relevance of the work is the development of new methods for rapid extraction (determination) of ore bodies in the underground mine of the field directly. Measurements were carried out both on specially prepared samples in the form of cubes of the same size, and under conditions of natural occurrence. Purpose of the work is to study the magnetic susceptibility and electrical resistivity of the main host rocks and the ore complex (emerald-bearing glimmerites and quartz-plagioclase veins with beryl) in the most famous Ural emerald-beryllium deposit, the Mariinsky deposit. Methodology of research. In order to study the magnetic properties of typical rocks and ore bodies of the Mariinsky deposit, the PIMV-M field magnetic susceptibility meter with a measurement range of 1 · 10–5… 1 SI units was used in the underground mine directly. The relative measurement error does not exceed ± 10% in the range of 10–4 ... 1 SI units. The measurement was carried out by applying the flat surface of the measuring transducer to the bottomhole wall in a lithologically homogeneous section with subsequent measurement and recording of the obtained value in the field document. To study the electrical resistivity, standard samples in the form of cubes of 24 × 24 × 24 mm were used; their composition was investigated with the help of binocular enhancer MBS-10. The measurements were carried out along three axes since almost all samples have anisotropy. The teraohmmeter E6-13A was used for working. Results. The data on the magnetic susceptibility and electrical resistance of the main host rocks and the ore complex (emerald-bearing glimmerites and quartz-plagioclase veins with beryl) from the Mariinsky deposit are presented. All data are adjusted with the petrographic characteristics of rocks. Conclusions. Possibility in principle is shown for creating a new express-method for isolating quick micaceous veins in wells and mine faces with the simultaneous measurement of magnetic susceptibility and electrical resistance of rocks during mining operations in an underground mine.