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Location: 23 km NE from Sanniquellie, Liberia
Nimba CountyYekepaLiberia
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The ArcelorMittal iron ore deposit at Yekepa, also known as the Nimba No. 1 Mine and referred to above as Mount Tokadeh, is also located in Liberia, <5 km SW of the Guinea-Liberia-Core d'Voire border intersection and 5 km from the original Nimba mine in Liberia. Following the civil war and subsequent changes in control, ArcelorMittal commenced mining of the Mount Tokadeh deposit at Yekepa, in 2011. Mineralisation occurs as a siliceous goethite/hematite/magnetite ore, containing ~60% Fe, 10% SiO2, 2% Al2O3 and 0.1% P. It is derived from a banded iron formation on Mount Gangra in the Yekepa Range. Three deposits within the MDA are grouped under the name “Western Range Project”, which includes the Mt. Tokadeh, Mt. Gangra and Mt Yuelliton deposits. The Nimba Itabirites is a 250 to 450-meter-thick recrystallized iron formation. Although the iron deposits at Mt. Tokadeh, Mt. Gangra and Mt Yuelliton fit the general definition of Itabirite as laminated metamorphosed oxide-facies iron formation, they are of lower iron grade than the ore previously mined at Mount Nimba.The Nimba deposits are hosted by the 1400 m thick Nimba Supergroup exposed as ridges bounded by lowlands of the older Yekepa Supergroup of quartzo-feldspathic gneisses and orthoamphibolites. The lower half of the Nimba Supergroup is comprises metamorphosed mafic volcanics of the Seka Valley Schists. The upper half of the supergroup is composed of metasediments subdivided into the:• Gbahm Ridge Formation - 250 m of quartz-chlorite-graphite phyllite with accessory muscovite, garnet, biotite, carbonate and tourmaline. The upper 50 m contains unward increasing interbeds of metachert;• Nimba Itabirite - a 250 to 400 m thickness of predominantly magnetite-quartz banded iron formation (BIF) which hosts the main orebody;• Mt Alpha Formation - >100m thickness of phyllite mainly composed of quartz and biotite with subordinate chlorite, muscovite, garnet, amphibole and pyrite.
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