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Location: 2 km W from Lola, Guinea
1Level 7, Al Maryah Tower Al Maryah IslandAbu DhabiUnited Arab Emirates
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The Lola Graphite occurrence is a paragneiss-hosted, crystalline, flake-type occurrence. The graphite-rich paragneiss is present at surface over 8.7 km with an average width of 370 m locally reaching 1,000 m. The graphite mineralization is hosted in the strongly sheared paragneiss. Graphite mineralization is well-exposed at surface on its entire strike length, with grades ranging from traces to as much as 20% of large flakes. The upper 32 m or so of the deposit are well-weathered (laterite), freeing graphite flakes from the silicate gangue and allowing for easy grinding with an optimal recovery of large and jumbo flakes. The graphite mineralization extends to depth into the non-weathered paragneiss. Observations under MOLP and SEM show that the main paragneiss is an assemblage dominated by quartz, andesine, orthoclase, and biotite with some sulphides (mainly pyrite ± chalcopyrite - galena - sphalerite). The accessory minerals visible in the fresh rocks are represented by zircon, apatite, rutile, monazite, and rare garnet crystals. Graphite flakes are aligned parallel to foliation and are elongated, somewhat stocky, and sometimes flexuous, varying in size between 10 x 100 µm and 0.3 x 2.3 mm. Over 70% of the flakes have a length greater than 300 µm. They are often shoddy at their ends and made up of slats (1 to 5 µm of thickness by 100 to 500 µm). Biotite and graphite intergrowth is often observed. Investigations by Energy Dispersive X-ray Spectroscopy and microprobe show that graphite flakes are made of pure carbon with no trace of other chemical elements. The rocks in the area were affected by an S1 foliation with subparallel primary stratification S0 still recognizable. General orientation S0 - S1 is N03° with a subvertical dip. The presence of synschistose folds indicates that the rocks were affected by at least two (2) phases of folding isoclinal P1 and P2 folds that deform S0 and S1. Sigmoid structures observed in quartz and quartzite association suggest that the area was affected by a dextral shear oriented N10°. The metamorphic paragneiss and other rocks appear to be the product of at least three (3) phases of metamorphism and deformation between 3.2 and 2.1 Ga.
