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Vanadium - Koitelainen

The Koitelainen layered intrusion is located in northern Lapland some 80 kilometres north-west of the Akanvaara layered intrusion is a large mafic layered intrusion with a surface area of some 350 square kilometres. Both intrusions resemble each other with regard to age (2.44 Ga) and igneous stratigraphy. The Koitelainen intrusion is flat lying, and is divided into ultramafic Lower Zone, and gabbroic Main and Upper Zones. Magnetite gabbro, which has reached a total thickness of at least some 100 metres, forms the uppermost unit of the Upper Zone.

The Koitelainen intrusion was extensively explored by the GTK from 1969 till early 1990’s. Vanadium rich magnetite gabbros have been drill tested in the eastern part of the intrusion, which is currently covered by claim reservations “Koitelainen 6-7” (Figure 1). Magnetite gabbro can be divided into lower, middle and upper subunits. The 40 metre thick lower subunit and 35 metre thick upper subunit are rich in vanadium grading some 0.35% and 0.35-0.50% V₂O₅, respectively. Vanadium content of the 20 metre thick middle subunit is less than 0.15%. The GTK research work shows that the V₂O₅ content in magnetite varies from 1.6% to 4.3% and in ilmenite from 0.30% to 1.25%. Also very high-grade magnetite concentrates with up to 5.0% V₂O₅ in magnetite and 1.7% V₂O₅ in ilmenite have been produced. The GTK drilling shows a good correlation between vanadium and platinum group elements. The average platinum+palladium+gold grade over a 75 metre drill core interval from the base of the magnetite gabbro unit is 0.5 g/t with a top value of 1.2 g/t.