BKT 0.00% 14.0¢ black rock mining limited

Ann: BKT achieves 99% TGC on both Graphite Primary Mineralisation-BKT.AX, page-2

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    Highlights • Optimised flotation process applied to Ulanzi and Epanko North fresh (primary) mineralisation achieved 99% TGC purities • This follows a weighted average of 99.1% TGC for the Ulanzi bulk (oxide) sample reported on 21 June • Results are from a conventional flotation circuit which offers additional optimisation potential • Potential to manufacture spherical graphite free of chemical purification from both Ulanzi and Epanko North, oxide and primary zones Screen Size Microns TGC Assay % Distribution % Cumulative distribution % Weighted Av. grade % +300 μm 99.0 12.5 12.5 99.0 +180 μm 99.1 34.7 47.2 99.1 +150 μm 99.0 10.8 58.0 99.1 +106 μm 99.1 14.2 72.2 99.1 +75 μm 98.8 10.0 82.2 99.0 +25 μm 98.2 9.4 91.6 98.9 -25 μm 87.5 8.3 99.9 98.0 Table 1. Epanko North primary mineralisation composite drill core. Assay results by size fraction and %TGC. TGC assays are by double LOI method. Black Rock Mining Limited (ASX.BKT) (“Black Rock Mining” or “the Company”) is pleased to announce new metallurgical test work results from the ongoing process optimisation program, this time from the fresh or primary composite samples of Ulanzi and Epanko North. The metallurgical team has surpassed 99% concentrate purity through relatively straightforward adjustments to the flowsheet. This is in additional to 99.1% TGC purity achieved for the Ulanzi bulk sample reported on 21 June 2016. The entire +75 to +300 micron portion of flake graphite is achieving average 99% TGC purity for primary mineralised zones and this represents 82% of the sample by weight. Over the next test phase we believe that there is scope to further improve the concentrate purities with additional cleaner work. The key outcome from this test is that exceptionally high purities in the 99% range can be achieved from both oxide and fresh portions of Ulanzi and Epanko North through a straightforward processing circuit whilst preserving flake size. Graphite at this high purity level will be sought after for battery and other applications and is expected to attract a price premium. 99% TGC purities achieved for Ulanzi and Epanko North primary mineralisation 5 July 2016 2 The recent high-grade results have generated considerable interest from graphite end users and traders who can see the potential to manufacture spherical graphite without the cost and environmental impact of chemical purification. Spherical graphite test work is underway in Europe to determine the suitability of Mahenge graphite for battery applications with results expected in late July. A separate spherical graphite characterisation programme is being undertaken with a new batch of 99% concentrates in response to achieving high flake graphite purities from the recent test work. BatteryLimits is managing the metallurgical test work and feasibility study work for The Company. BatteryLimits’ Managing Director Phil Hearse said, “Continuous optimisation of the metallurgical test work program has returned excellent flake size distribution and concentrate assay results. Working closely in conjunction with the Black Rock Mining team and its consultants, BatteryLimits will press ahead with this optimisation process and we expect to see on-going improvement in graphite concentrate grades as testing of the Ulanzi and Cascade mineralisation ramps up.” New metallurgical samples are being prepared in Tanzania this month to comprehensively test additional portions of the Ulanzi and Cascade lodes. Two more bulk surface samples and numerous drill core samples from Ulanzi and Cascade are being prepared for shipping and will be processed with the amended process circuit. In order to produce in excess of 1t of high purity flake concentrate, a continuous pilot scale process is being evaluated. This will provide considerably more data from which to finalise the processing circuit design. The metallurgical programme will continue as scheduled for the next four to six months, in parallel with the current Pre Feasibility and proposed Definitive Feasibility Studies. Managing Director of Black Rock Mining Steven Tambanis commented: “This is yet another excellent result from our metallurgical team which markedly increases processing confidence. Achieving >99% purities for both oxide and primary zones at Ulanzi and Epanko north underpins the potential for the Mahenge Project to deliver superior graphite products to market, in particular the fast growing lithium ion battery market. We look forward to applying our processing improvements to new bulk-scale metallurgical samples expected from site this month. Significantly, this provides potential for Black Rock Mining to brand and market spherical graphite product as being processed without chemical purification.”
 
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