TY - JOUR

T1 - Gold–Rare-Metal Mineralization of the Mokrundya Placer Deposit in Arctic Siberia, Republic of Sakha (Yakutia)

AU - Airiyants, E. V.

AU - Belyanin, D. K.

AU - Zhmodik, S. M.

AU - Ivanov, P. O.

AU - Kiseleva, O. N.

N1 - The work was carried out according to the state assignment of V.S. Sobolev Institute of Geology and Mineralogy (Novosibirsk), with the financial support of the Ministry of Science and Higher Education of the Russian Federation and the Russian Foundation for Basic Research (project No. 18-05-70109).

PY - 2023

Y1 - 2023

N2 - The Mokrundya alluvial-placer gold deposit is located in the Verkhoyansk–Kolyma folded region, within the Tuguchak ore–placer cluster. The authors used ore and scanning electron microscopy and chemical–analytical methods to study the typomorphic and mineralogic–geochemical features of gold, minerals of the heavy fraction of the placer, and ore mineralization of the dolerite dike complex stripped in the placer bedrock. Stages of development of the ore-forming system in dolerites have been established. The main productive periods with native gold are associated with the postmagmatic stages: (a) early arsenopyrite–polysulfide stage and (b) gold–bismuth–tellu-ride stage. The latter is composed of bismuth tellurides and sulfotellurides, native gold, bismuth, maldonite AuBi2, and complex Au and Bi intermetallic compounds. The authors hypothesize the sources of placer gold in the alluvial deposits. One of them is the ore mineralization of the dolerite dike complex, and the other is associated with mineralized zones of the Gematitovoe skarn–hydrothermal ore occurrence in the upper reaches of the Mokrundya Stream.

AB - The Mokrundya alluvial-placer gold deposit is located in the Verkhoyansk–Kolyma folded region, within the Tuguchak ore–placer cluster. The authors used ore and scanning electron microscopy and chemical–analytical methods to study the typomorphic and mineralogic–geochemical features of gold, minerals of the heavy fraction of the placer, and ore mineralization of the dolerite dike complex stripped in the placer bedrock. Stages of development of the ore-forming system in dolerites have been established. The main productive periods with native gold are associated with the postmagmatic stages: (a) early arsenopyrite–polysulfide stage and (b) gold–bismuth–tellu-ride stage. The latter is composed of bismuth tellurides and sulfotellurides, native gold, bismuth, maldonite AuBi2, and complex Au and Bi intermetallic compounds. The authors hypothesize the sources of placer gold in the alluvial deposits. One of them is the ore mineralization of the dolerite dike complex, and the other is associated with mineralized zones of the Gematitovoe skarn–hydrothermal ore occurrence in the upper reaches of the Mokrundya Stream.

KW - gold–bismuth–telluride mineralization

KW - maldonite

KW - native gold

KW - northeastern Republic of Sakha

UR - https://www.scopus.com/inward/record.url?eid=2-s2.0-85147531569&partnerID=40&md5=fd1935e9a571104619597a3fd1af48d7

UR - https://www.mendeley.com/catalogue/b70bb10f-5be1-3f96-8fd4-6d4eb750da6c/

U2 - 10.2113/RGG20214390

DO - 10.2113/RGG20214390

M3 - Article

VL - 64

SP - 158

EP - 174

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 2

ER -