Ayat iron ore basin

AYAT IRON ORE BASIN (RU: Аятский железорудный бассейн) is situated within the Kustanai province of the Kazakh SSR, at the distance of 20 kilometres from the Tobol railway station to the north. It is known since the 90-ies of the 19th century according to the works by the geologist A.A.Krasnopolsky, it has been explored during the 1946-50.

The length of the basin from the west to the east is more than 60 kilometres, from the north to the south is more than 50 kilometres, the area of the extent of the ore layer is 2500 square kilometres, the thickness is 2-9 metres.

The Ayat iron ore basin belongs to the group of the sedimentary marine deposits, which have formed themselves on the young epi-Hercynian tectonic plate. The ore layer, whch has been formed by the oolitic leptochlorite-siderite ores, has fairly orderly strike and thickness, is situated horizontally or with slight undulation, with the general slight slope down to the east and north-east; it is embedded on the quartz-glauconite sands, less often on the clays of the Cenomanian, yet less often on the Paleozoic effusive-sedimentary rocks of the basement and their ancient eluvium. There usually serve as the roof of the ore layer the lignite clays of the lower Senonian, or the overlying Cretaceous and Tertiary marine sedimentary depositions. Within the depressions of the Paleozoic basement under the iron ores, there may be found the industrial depositions of the bauxite and fire clays. The iron ores are oolitic leptochlorite-siderite, oxidized hydrogoethite and redeposited hydrogoethite. The main ore minerals of the iron are the leptochlorite, siderite, hydrogoethite; there may be found in smaller quantities the glauconite, quartz, and pyrite.

The explored reserves of the Ayat iron basin (on the area of 220 square kilometres) are 1.7 billion tonnes, the preliminarily estimated ones are 5 billion tonnes (1980). For the reserves, which have been explored, the average thickness of the ore layer is 4.35 metres, the thickness of the overburden is up to 40 metres (22 metres on average). For the usage of the ores, there is being designed the usage of the roasting-magnetic scheme for the beneficiation.