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In all of these, some of the stratigraphic and sedimentological features of the original iron formation are preserved.
ARM provides administration and technical services, while Assore performs the sales and marketing function as well as technical consulting services.
Down-dip to the west, the ore is thin and deep. It consists of stacked, upward fining conglomerategritstone-shale sedimentary cycles. The strike of the ore bodies is also in a north-south direction dipping to the west, but less continuous.
The washing and screening plants consist primarily of tertiary crushing, washing, screening, conveying and stacking equipment.
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Numerous deeper iron ore extensions occur into the basins due to karst development. The conglomeratic ore is found in the Doornfontein Conglomerate Member of the Gamagara Formation, is lenticular but not consistently developed along strike.
The down-dip portions are well preserved and developed, but in outcrop the deposits are thin and isolated. Outcrops are limited to the higher topography on the eastern side of the properties.
The erosion of the northern Khumani deposit is less than in the southern Beeshoek area. A prominent north south strike of the ore bodies dipping to the west is notable.
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The boundaries of high-grade hematite ore bodies crosscut primary sedimentary bedding, indicating that secondary hematitisation of the iron formation took place. The amount of iron ore pebbles decreases upwards in the sequence so that upper conglomerates normally consist of poorly sorted, angular to rounded chert and banded iron formation pebbles.
Hematite is the predominant ore mineral, but limonite and specularite also occur. Processing Technologies Wash plant Summary: The beneficiation plants consist of tertiary crushers; scrubbers; coarse and fine jigs; lumpy and fines product stockpiles; and a rapid load-out facility.
The southern Beeshoek ore bodies were exposed to more erosion and hence are more localised and smaller.
The lowest conglomerates and gritstones tend to be rich in sub-rounded to rounded hematite ore pebbles and granules and form the main ore bodies. Mining operations are all open-pit, based on the conventional drill-and-blast, truck-and-shovel operations.
No chemicals are being used in any of the treatment plants. This results in Khumani being characterised by larger stratiform bodies and prominent hangingwall outcrops.
The iron ore deposits are formed within in a sequence of early Proterozoic sediments of the Transvaal Supergroup deposited between 2 and 2 million years ago.
In general, two ore types are present, namely laminated hematite ore forming part of the Manganore Iron Formation and conglomerate ore belonging to the Doornfontein Conglomerate Member at the base of the Gamagara Formation. Deposit Type Sedimentary Summary:
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