Molybdenum mineralization in the rocks of the Kryvbas

Velikanov, Y.F.; Velykanova, O.Y.

doi:10.15407/gof.2014.34.050

Geohìm. rudoutvorennâ

2014

DOI: 10.15407/gof.2014.34.050

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Molybdenum mineralization in the rocks of the Kryvbas

Y.F. Velikanov¹,

O.Y. Velykanova²

Abstract: Введение. Молибденит -один из стратегических металлов, применяемый во многих отраслях современной промышленности. Выявление промышленных месторождений и рудопроявлений имеет первостепенное значение при поисковых работах, для чего необходимо установление геолого-структурных, минералого-петрографических и геохимических особенностей, а также условий локализации молибденового оруденения в породах Украинского щита.Богатые молибденовые руды содержатMo, %: более 0,5, рядовые 0,2-0,5, бедные 0,1-0,2 и низкосортные ком… Show more

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Molybdenum Mineralization of the Hannivka Deposit, Kryvyi Rih Structure

Sukach,

Baryatska,

Bondarenko

et al. 2023

Mìneral. ž.

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The Hannivka molybdenum deposit is located in the northeastern side of the Kryvyi Rih structure, within the East Hannivka monocline. Molybdenum mineralization is confined to the contact zone of granitoids of the Demuryne complex with metabasites of the Novokryvorizka suite. The main volume of molybdenum mineralization is concentrated in the exocontact, in metabasites, and only 10-15% in endocontact granitoids. The molybdenum-bearing zone is represented by schistose, moderately quartzized and biotitized fine-grained metabasalts, which contain quartz, epidote-quartz, epidote, sometimes feldspar-quartz veins and veinlets and moderate (0.5-3%) sulfide mineralization. The volume of vein material ranges from 0.5% to 3-5%. The geological-morphological type of mineralization is defined as linear stockwork. Leading processes responsible for the development of molybdenite are quartzization and biotitization, namely silicic-alkaline metasomatism. Using JSM-6700F і JXСА-733 electron microscopes, the following ore minerals have been diagnosed and studied: magnetite, ilmenite, molybdenite, loellingite, arsenopyrite, pyrrhotite, pyrite, chalcopyrite, sphalerite. Based on their structural positions and relationships, several successive ore stages have been identified: early oxide (ilmenite-magnetite), main sulfide with molybdenite, potentially gold-bearing arsenide-sulfoarsenide-sulfide and late sulfide. Molybdenite is localized in zalbands of thin (1-3 mm, occasionally up to 2 cm) quartz veinlets, sometimes in the form of boudinaged structures, lenses and pockets reaching sizes up to 4 cm, as well as in host metabasalts and plagiogranites. Conditionally, three morphological types of molybdenite can be distinguished: a) medium-sized elongated tabular, platy, and foliated crystals ranging in size from 0.1 mm to 1.5-2 mm, which are oriented subparallel to the vein structures and rock foliation; b) fine-grained (from 10-20 µm to 0.1 mm) elongated flakes uniformly or randomly oriented; с) isometric crystals of hexagonal-tabular habitus with sizes ranging from 0.1 to 0.7 mm. Outlined are several areas that require further investigation: epitaxial growths of molybdenite and silicates and the conditions of their formation, the time of formation of molybdenite and ore-generating granitoids.

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Molybdenum Mineralization of the Hannivka Deposit, Kryvyi Rih Structure

Sukach,

Baryatska,

Bondarenko

et al. 2023

Mìneral. ž.

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Complex Gold-Molybdenum Deposits and Occurrences in Greenstone Belts of the Middle Dnipro Region of the Ukrainian Shield

Sukach

Riazantseva²

2018

МРУ

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The most important molybdenum mineralization of the Middle Dnipro province is limited to the Mesoarchean (3,1–2,9 Ga) Greenstone belts or structure (GSS). These are next occurrences: East-Sergiivka, Solone in the Sura GSS and Gannivka (district “Chervona”) in the Kryvyi Rih GSS. They have spatial combining or closeness with well-known gold deposits and occurrences: East-Sergiivka and Solone occurrences are located on the Eastern flanks of the Sergiivka and Balka Zolota deposits, respectively, in the sublatitudinal ore-bearing zones. From the West to the East gold mineralization gradually changes to gold-molybdenum and molybdenum. Gannivka molybdenum and Zhovtіanka gold occurrences are adjacent and localized in the submeridional zone of the Kryvyi Rih-Kremenchuk fault, and not spatially combined. However, similar to the etalon Lobash deposit, they can be combined as elements of a common ore-generating system related to a submeridional-extended granite massif undiscovered by erosion. In the process of previously performed geological surveys and related research, these ore prospects were studied and evaluated separately for each type of minerals. It is proposed to carry out further geological research in the context of spatially and genetically combining of gold and molybdenum mineralization. First of all it concerns deposits and occurrences of Sura GSS, where it is rationally to place two complex gold-molybdenum deposits: Sergiivka and Balka Zolota. This approach, which involves carrying out mining and exploration works on a joint scientific and technical base for molybdenum and gold ores, will undoubtedly have good economic efficiency and, ultimately, substantially increase the investment attractiveness of one or another deposit, facilitate the early launch industrial exploitation.

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Molybdenum mineralization in the rocks of the Kryvbas

Cited by 2 publications

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Molybdenum Mineralization of the Hannivka Deposit, Kryvyi Rih Structure

Molybdenum Mineralization of the Hannivka Deposit, Kryvyi Rih Structure

Complex Gold-Molybdenum Deposits and Occurrences in Greenstone Belts of the Middle Dnipro Region of the Ukrainian Shield

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