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Abstract <p>The paper provides a brief geological description of the Southern Ashaly mineral deposit within which ores of the gold-sulfide and gold-low-sulfide-quartz types were recognized. Two ore mineralization stages were established, that incorporate four substages: the pyrite, pyrite-arsenopyrite, sulfide, and polymetallic ones. The morphological and mineralogical-geochemical features of the major, minor, and rare ore minerals were studied in detail. The following successive pyrite generations including six varieties are distinguished: diagenetic (Py-I), metamorphic (Py-II), and hydrothermal (Py-III). The Py-I variety is enriched in V, Ti, Mo, Sn, Sb, W, Pb and Bi, with the spherical (Py-Ib) variety enriched in V, Mn, Ti, Mo, Sn, Sb, REEs, W, Pb, and Bi and depleted in Ni, Cu, As, Ag, and Au relative to the spherical-streaky (Py-Ic) variety. Py-II is depleted in Zn, Cu, Pb, Ag, Mo and enriched in Au, As relative to Py-I. Py-III is enriched in As relative to other generations. Native gold of two generations is formed at the pyrite, pyrite-arsenopyrite (early) and sulfide (late) substages with an average gold fineness of 884 and 998 ‰, respectively. An elevated Au and Ag concentrations (g/t) were found in Py-Ib—4.14 and 10.4; Py-Ic—26.4 and 13.4; Py-IIcore—484.1 and 39, Py-IIa—85 and 14.5; Py-IIb—56 and 1; Py-III—0.5 and 1.7; and in arsenopyrite-I, 230 and 20, respectively. The temperature of transformation of the carbonaceous matter in rocks of the Bukon Formation and temperature of formation of gold-sulfide ores type varies from 384 to 241°C, which corresponds to the greenschist-zeolite facies of metamorphism.</p>

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Mineralogical and Geochemical Peculiarities and Gold Content of Pyrite and Arsenopyrite of the Southern Ashaly Gold Deposit (East Kazakhstan)

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • E. D. Greku,
  • Yu. A. Kalinin,
  • A. N. Serdyukov,
  • E. A. Naumov,
  • A. A. Borovikov,
  • A. L. Ragozin,
  • A. S. Gladkov

摘要

Abstract

The paper provides a brief geological description of the Southern Ashaly mineral deposit within which ores of the gold-sulfide and gold-low-sulfide-quartz types were recognized. Two ore mineralization stages were established, that incorporate four substages: the pyrite, pyrite-arsenopyrite, sulfide, and polymetallic ones. The morphological and mineralogical-geochemical features of the major, minor, and rare ore minerals were studied in detail. The following successive pyrite generations including six varieties are distinguished: diagenetic (Py-I), metamorphic (Py-II), and hydrothermal (Py-III). The Py-I variety is enriched in V, Ti, Mo, Sn, Sb, W, Pb and Bi, with the spherical (Py-Ib) variety enriched in V, Mn, Ti, Mo, Sn, Sb, REEs, W, Pb, and Bi and depleted in Ni, Cu, As, Ag, and Au relative to the spherical-streaky (Py-Ic) variety. Py-II is depleted in Zn, Cu, Pb, Ag, Mo and enriched in Au, As relative to Py-I. Py-III is enriched in As relative to other generations. Native gold of two generations is formed at the pyrite, pyrite-arsenopyrite (early) and sulfide (late) substages with an average gold fineness of 884 and 998 ‰, respectively. An elevated Au and Ag concentrations (g/t) were found in Py-Ib—4.14 and 10.4; Py-Ic—26.4 and 13.4; Py-IIcore—484.1 and 39, Py-IIa—85 and 14.5; Py-IIb—56 and 1; Py-III—0.5 and 1.7; and in arsenopyrite-I, 230 and 20, respectively. The temperature of transformation of the carbonaceous matter in rocks of the Bukon Formation and temperature of formation of gold-sulfide ores type varies from 384 to 241°C, which corresponds to the greenschist-zeolite facies of metamorphism.