Natural graphite (flake graphite) is mostly consumed for refractories, batteries, steelmaking, expanded graphite, brake linings, foundry facings and lubricants. Natural graphite has several advantageous properties such as excellent thermal and electric conductivity; Outstanding lubrication properties specially under high temperatures and pressures; graphite is highly resistant to oxidation and to most chemical agents and is thus used in making fireproof materials; Formation of intercalation compounds, which helps in the application of graphite in the fields of special lubricants and rechargeable batteries.
DFL’s graphite deposit is an active exploration property, with significant exploration work completed. The property is also highly prospective for alluvial gold and base metals. DFL will apply for a mining concession for the project in 2017, which will enable further development of the project.
The License is located in the Chiúre district of the rapidly developing Cabo Delgado Province of Mozambique which hosts some of the world class graphite and natural gas deposits and is the only graphite producing province in Mozambique – with GK having re-commenced production at the Ancuabe Mine and the Syrah’s Balama mine advancing soon towards production.
Our deposit is about 70 km along a straight line to the south west of the port of Pemba and is is adjacent to the licence held by Graphite Kropfmühl, where they plan to focus on developing the Nipacué graphite deposit.
The geology of the prospecting property is underlain by the Ocua Complex within the Proterozoic Lurio metamorphic belt.
The graphite horizons are mainly associated with biotite gneiss and mylonitic quartz feldspar gneiss with the graphite occurring both as flake graphite and fracture infill graphite.
The main target has a strike length of about 5.4km and is estimated to contain between 5-9 Million tons of graphite upto a depth of 50 metres with an average graphite grade of approximately 5.1 % TGC (grades ranging from 3.6% to 6.9% TGC). Significant potential for additional quantities exist as several other targets which have been drill tested are yet to be investigated in detail.
Flotation Test work done at specialist graphite testing laboratories in Germany till date show that it is possible to achieve carbon content in the range of 94% and higher via conventional flotation on DFL’s raw graphite ore with large flakes sizes (+80 mesh) in the concentrates ranging from 32% to 43%.
The graphite concentrate that can be produced from this deposit is suitable for all industrial uses including refractory, expandable graphite, graphite foil, brake lining pads, lubricants and pencils. The absence of quartz grains in the concentrate ash makes it especially useful in lubricants and brake linings where low abrasion is important.
Additionally, Test work has further shown that ash of our graphite has a softening temperature of 1245 °C, Hemispherical Temperature of 1333°C and Flow temperature of 1361 °C, which exceeds the averages of graphite from most countries worldwide, and particularly indicates that the application of this graphite in refractories will be very good.
Purification Testwork have shown that in a first attempt an LOI of > 99.5 % for all flake size fractions was achieved. Highest LOI of 99.90 % was achieved with flake size < 300 µm > 180 µm. The tests indicated that this flake graphite is suitable for all applications of flake graphite. This includes, potentially, the production of spherical graphite for Li-Ion batteries with purity of 99.95 % min., expandable graphite, graphite foil, refractory products, etc.
Expandability test work on a split of the +180 µm concentrate confirmed the suitability of the material for the production of expandable graphite, which is used to make graphite foil for high value fire retardant and heat conduction applications.