Золотое оруденение Нижне-Мякитского рудно-россыпного узла (Северо-Восток России)

Abstract

A comprehensive study of native gold and ore mineral parageneses of the Berental intrusive-dome structure in the southeastern part of the Yano-Kolyma gold-bearing belt has been carried out. The zonality of mineralization is shown: from the central part (in the Berental stock endocontacts) with the Au-Bi-Te mineralization "style" to - As-Au (in the exocontacts of the stock) and, further, to Ag-Pb-Zn on the periphery. In the same direction changes the fineness of native gold in ores, from high and medium to low fineness. Antimony mineralization was noted at the final stage of ore formation. Vertical zoning is expressed in the silver-polysulfide type of mineralization changing with depth to sulfide-sulfoarsenide and, lower, bismuth-sulfotelluride. A rare mineral, maldonite (Au2Bi), is relatively widespread. The end-to-end ore minerals are pyrrhotite, native bismuth, and its tellurides. The obtained facts permitted to attribute the hydrothermal system of the Berental stock to the RIRGD type, i. e. to gold deposits associated with restored intrusives, which can contribute to the improvement of the methodology for prospecting and evaluation works at deposits of this type and to the discovery of large occurrences in terms of reserves.