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The Arola deposit can be divided into three distinct zones comprising discontinuous lenses over 400 metres of strike length and 400 metres below surface. Two of the zones are almost parallel to the orientation and shearing of the host rock and they are about 40 metres apart from each other. The third mineralised zone cross cuts the schistosity at an angle of approximately 35º. All mineralised zones are composed of several discontinuous lenses. The more coherent lenses are interpreted to plunge approximately 40° to the north (SMOY, 1968, reference 15).
The main sulphide minerals are pyrrhotite, pyrite and pentlandite. Nickel content is commonly less than 1%; the highest grade assayed is 5.72% nickel. Copper grade is low, usually less than 0.1% and the highest value is 0.4% copper. The content of platinum group elements is very low, <0.04ppm. Nickel tenor varies quite a lot from 2% up to 25%, the average being 10-15%.
Outokumpu completed a polygonal resource estimate on vertical cross sections which quotes 1.5 million tonnes at 0.46% nickel.