Geology and pyrite-polymetallic mineralization of the forecasted Limonite deposit, Rassokhinsky ore cluster (Yenisei ridge)

Abstract

The development of Russia’s largest Gorevskoye leadzinc
 deposit (Gorevsky GOK, Novoangarsky OK) will
 depend on promising deposits of the Angara polymetallic
 ore region, in particular, those of the Rassokhinsky
 ore cluster. Based on the analysis of geological and geophysical
 information of previous and current studies,
 a major Limonite pyrite-polymetallic (massive sulfide)
 deposit is forecasted within it. The main lithological
 and stratigraphic criterion for the localization of ores is
 determined by their confinement to high-carbon black
 quartz-sericite schists of the upper subformation of the
 Potoskuy suite of the Upper Riphean. In the top of this
 pack, layered and massive pyrite-polymetallic ores, 70–
 140 m thick, are localized. Based on PPA data, lead and
 zinc content in core varies from fractions of a percent
 to several percent, based on the ICP-AES method: 0,1–
 3,7 % Pb, 0,1–6,4 % Zn, Pb : Zn ratio is 1 : (1–10).