RESOURCES - NORTH REEF
West Pana Massif
Northern PGE-bearing Reef
The Northern PGE-bearing Reef in the Lower Layered Horizon is a sulfide-enriched zone, which is continuous along strike for over 16 km and is concordant with the rock layering. Ore bodies and lenses are concentrated mainly in the central part of the LLH. Occassionally, PGE-bearing sulfide mineralization is found in monotonous leucogabbro layers. The thickness of the reef varies from 1 to 15 m.
The structure of the LLH and the position of the Northern PGE-bearing Reef are shown on. Ni, Cu, PGE and Au are irregularly distributed in the ore body. The Northern PGE-bearing Reef is composed of the Main and Upper ore bodies and several ore lenses.
The Main Ore Body, which is intersected by 54 boreholes for 9700 m along the strike, holds 80% of the estimated reserves of the Northern PGE-bearing Reef. Using a PGE+Au cutoff grade of 1 g/t, the average thickness of the Main Ore Body varies from 1.1 2.1 m. The average grade is: Ni = 0.12-0.16%, Cu = 0.16-0.19%, and PGE+Au = 3.094.23 g/t, with a Pd/Pt = 8.28 and Ni/Cu = 0.90. Though assays may grade up to 21 g/t PGE+Au, base metal and PGE grades are generally uniform throughout the Main Ore Body.
Further information in a 2008 Powerpoint presentation by Alexei Korchagin (in Russian)
PGM in Kola
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