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Abstract <p>It is established that the weathering mantle (WM) and technogenic placers of the Lower Selemdzha gold-bearing cluster in Amur Region contain newly formed native gold in both the rock matrix directly associated with native gold and on the surface of its grains. In the WM, we revealed film and isometric native gold on the surface of native gold and porous interstitial native gold in host loose rocks. The size of the particles varies from 0.2 to 3 µm. The composition of authigenic gold includes Au–Ag–Cu, Au–Cu, and chemically pure noble metal (1000‰). In technogenic placers, we identified film, spheroidal, dendritic, fibrous, vermiform, globular, and spongy new gold. The size of its particles ranges from 0.1 to 1 µm. The composition of gold varies from multicomponent (Pb–Au–Hg–Sn), (Au–Pb–Hg–Ag), (Au–Pb–Hg), and (Au–Hg–Ag), (Au–Hg) to chemically pure. In spite of the different composition, the formation of new gold in natural (WMs) and technogenic (placer dumps) objects is probably similar. Supergene transformations lead to the decomposition of host Au minerals, release of metals, and their further precipitation. Geochemical barriers for the precipitation and concentration of the noble metal include absorption properties of the host rocks, as well as the particles of new ultrafine clusters of native gold, mercury, lead, copper, tin, and their compounds. Organic/inorganic carbon plays the role of a reducing agent.</p>

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“New” Native Gold in Weathering Mantle and Technogenic Placers of the Lower Selemdzha Gold-Bearing Cluster, Amur Region

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • I. V. Kuznetsova,
  • P. P. Safronov

摘要

Abstract

It is established that the weathering mantle (WM) and technogenic placers of the Lower Selemdzha gold-bearing cluster in Amur Region contain newly formed native gold in both the rock matrix directly associated with native gold and on the surface of its grains. In the WM, we revealed film and isometric native gold on the surface of native gold and porous interstitial native gold in host loose rocks. The size of the particles varies from 0.2 to 3 µm. The composition of authigenic gold includes Au–Ag–Cu, Au–Cu, and chemically pure noble metal (1000‰). In technogenic placers, we identified film, spheroidal, dendritic, fibrous, vermiform, globular, and spongy new gold. The size of its particles ranges from 0.1 to 1 µm. The composition of gold varies from multicomponent (Pb–Au–Hg–Sn), (Au–Pb–Hg–Ag), (Au–Pb–Hg), and (Au–Hg–Ag), (Au–Hg) to chemically pure. In spite of the different composition, the formation of new gold in natural (WMs) and technogenic (placer dumps) objects is probably similar. Supergene transformations lead to the decomposition of host Au minerals, release of metals, and their further precipitation. Geochemical barriers for the precipitation and concentration of the noble metal include absorption properties of the host rocks, as well as the particles of new ultrafine clusters of native gold, mercury, lead, copper, tin, and their compounds. Organic/inorganic carbon plays the role of a reducing agent.