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Location: 60 km SW from Huambo, Angola
Rex House, 4th Floor, 4 – 12 Regent Street St JamesLondonUnited KingdomSW1Y 4PE
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Mining scale, mining and mill throughput capaciites.Full profiles of select mines and projects.
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Pensana Metals Limited is a wholly-owned subsidiary of Pensana Plc.
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The Longonjo carbonatite is located within the north-east-orientated Lucapa Lineament of central Angola. Longonjo is a Cretaceous-age, sub-circular carbonatite diatreme, approximately 2.5km in diameter, which is intruded into Neoproterozoic granitic rocks. REEs, including NdPr mineralisation, are widespread across the carbonatite.A horseshoe-shaped ring of hills surrounds much of the carbonatite and consists of more resistant potassic and sodic-altered granitic country rocks (fenite) and carbonatite ring dykes. High-level explosion breccias of mixed carbonatite and fenite clasts form the bulk of the carbonatite body, with sub-vertical ring dykes and carbonate plugs cutting and intruding the northern and southern margins of the carbonatite and surrounding fenite.The fenite ring surrounding the carbonatite proper also contains additional fenite bands and fenite-dominated breccias. Disseminated rare earth mineralisation is particularly enriched in the near surface weathered zone, which forms a sub horizontal residual blanket of soft iron rich material. Mineralisation also occurs in fresh rock beneath the weathered zone horizon.Natural weathering processes have removed the original carbonate minerals in the weathered zone through dissolution, thereby enriching the NdPr rare earth minerals left behind. The weathered zone and associated veneer of locally transported soil and gravel typically ranges between 20 to 30 metres in thickness but reaches 70 metres in some areas.Rare earth minerals within the weathered zone are predominantly monazite with some bastnaesite occurring in peripheral areas.
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