Petrophysical zoning elements of Chertovo Koryto gold-ore deposit (Patom Upland, Eastern Siberia)

S V Sokolov,D A Terre,Y V Kolmakov

doi:10.1088/1755-1315/27/1/012028

Abstract

The paper considers magnetic susceptibility (χ) and electrode potentials (EP) of rocks in the Chertovo Koryto deposit. Carbon-bearing substance is found in all the studied samples, but in some cases, this substance supplies EP (−150 ÷ −400 mV). In these samples χ rarely exceeds 40·10-5 SI units, while, in other samples χ is 8-10 (up to 30) times higher. Less intensive EP (-20 ÷ -240 mV) is furnished due to the sulfides in this deposit. Rocks with polarized carbon-bearing substance do not contain magnetic pyrrhotine and are negative linear EP anomalies. Rocks in which carbon-bearing substance is associated with pyrrhotine are revealed as magnetic anomalies. The adjacent rocks determine petrophysical zoning of the Chertovo Koryto deposit. The combination of negative linear EP anomalies and magnetic anomalies is a potential indicator and can define the multi-stage formation of the deposit itself.

Highlights

Central Patom Upland hosts Bodaibo ore-placer area where gold-mineralization has been explored completely
Geological structure The extended ores in the Chertovo Koryto deposit are located in Low-Proterozoic terrigeneoussediment formations of Mikhailovsk suite, which, in its turn, includes carbon-bearing substance content of up to 2%
Research results With reference to carbon-bearing substance electrode potential (EP) was detected only in 42 samples from 301-307 wells

Summary

Introduction

Central Patom Upland hosts Bodaibo ore-placer area where gold-mineralization has been explored completely. Today this area embraces precious metal reserves of thousands of tons including the unique Sukhoi Log deposit. Being currently placed under production, Chertovo Koryto deposit, containing more than 100ton reserves, confirms the gold mineralization potential of this area (figure 1). Efficiency of the magnetic survey in Chertovo Koryto deposit [3] makes it possible to apply geophysical methods in prospecting similar deposits. 2. Geological structure The extended ores in the Chertovo Koryto deposit are located in Low-Proterozoic terrigeneoussediment formations of Mikhailovsk suite, which, in its turn, includes carbon-bearing substance content of up to 2%.

Published under licence by IOP Publishing Ltd

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