Genetic features of supergene modified gold in weathering crusts

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Abstract
Analysis of the available materials shows that the main problem in assessment of the role of secondary gold mineralization lies in the determination of specific features of transitional forms of native gold. The classification mentioned above suggests that supergene transformation of primary gold is an irregular process. At first, gold is only dissolved leading to the development of relict gold particles. The gold is precipitated subsequently from aqueous solutions. Our investigations of the auriferous weathering crust in the Polar Urals have provided new insight into processes of the modification of primary gold mineralization in the course of supergenesis. We studied the auriferous weathering crust in the Katalamba deposit confined to the Mesozoic‐Cenozoic erosional-tectonic depression [10]. Walls of the depression enclose Riphean and Early Ordovician rocks that are stable during weathering. The depression floor includes Late Riphean carbonate and volcanosedimentary rocks. Supergene rocks and auriferous ores are developed in intensely fractured and crushed rock zones dipping at 55 ° ‐60 ° NW. The tectonic zone is more than 2 km long and 250 m wide. The mineralized zone is 400‐100 m long and 80‐150 m wide.

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