2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University 10.31897/PMI.2021.2.4 pmi-13881 https://pmi.spmi.ru/pmi/article/view/13881 Геология Geology Features of the mineral and chemical composition of the Northwest manganese ore occurrence in the Highveld region, South Africa Особенности минерального и химического составов Северо-Западного рудопроявления марганца в районе Хайфельда, ЮАР Evdokimov Aleksandr N. Евдокимов А. Н. Evdokimov Aleksandr N. evdokimov48@list.ru Санкт-Петербургский горный университет (Санкт-Петербург, Россия) Saint Petersburg Mining University (Saint Petersburg, Russia) Pharoe Benedict L. Пхарое Б. Л. Pharoe Benedict L. benedictpharoe1@gmail.com Санкт-Петербургский горный университет (Санкт-Петербург, Россия) Saint Petersburg Mining University (Saint Petersburg, Russia) 24 06 2021 2021 248 195 208 20 08 2020 01 04 2021 24 06 2021 © Aleksandr N. Evdokimov, Benedict L. Pharoe 2021 А. Н. Евдокимов, Б. Л. Пхарое Aleksandr N. Evdokimov, Benedict L. Pharoe CC BY 4.0 https://pmi.spmi.ru/pmi/article/view/13881

Северо-Западное рудопроявление марганца расположено на удалении от традиционных районов добычи в новом марганценосном районе Южно-Африканской республики, в пределах района Хайфельд, на площади фермерских хозяйств: Бухансвейл 61 IQ, Вельтевреден 517 JQ, Реностерхук 343 JP и Кафферскрааль 306 JP. Полученные данные по геологии этого рудопроявления представляют интерес для разработки критериев поиска аналогичных руд на северо-западе ЮАР. Здесь руда встречается в виде порошкообразного марганцевого вада, марганцевых конкреций и корок, приуроченных к карстовым структурам на верхней части разреза доломитов. Для характеристики рудопроявления были изучены минеральный и химический составы руды методами рентгеновской дифрактометрии, растровой электронной микроскопии и рентгеновской флуоресценции. Приведены результаты изучения состава марганцевой руды по площади и на глубину распространения. Установлены области развития карстового процесса, который вызвал увеличение локальной мощности рудного тела. Результаты изучения минерального и химического составов руд свидетельствуют об их гипергенном генезисе. Главные рудные минералы: криптомелан, литиофорит, пиролюзит, голландит и романехит, примесные компоненты: Ba, Ce, Co, La, Ni, Cr, Zn и V.

The Northwest manganese ore mineralisation is located at a relative distance from traditionally known manganese mining areas in a new manganese-bearing region (Highveld) in the Northwest Province, Republic of South Africa. The ore occurrence was studied on farms: Buchansvale 61 IQ, Weltevreden 517 JQ, Rhenosterhoek 343 JP and Kafferskraal 306 JP. The data obtained from studying the geology of the area pointed out to interests regarding the development criterias for search of similar ore mineralisations in the northwest region of South Africa. The ore occurs predominantly in the form of powdered manganese wad, manganese nodules and crusts, confined to the karstic structures of the upper section of the dolomites. X-ray powder diffraction (XRD), Scanning electron microscopy with energy dispersive link (SEM-EDS) and X-ray fluorescence were utilized to unveil the mineral and chemical composition of the ore samples. The present study therefore presents the results on both chemical and mineral composition of manganese ores, and their depth and longitudinal distribution. Karstic areas causing an increased local thickness of the ore body were identified. The geochemical and microspcopic study of the ores indicates their supergene nature. The main ore minerals includes cryptomelane, lithiophorite, purolusite, hollandite and romanechite associated with impurity components of Ba, Ce, Co, La, Cr, Zn and V.

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