CGM. Large flake, high purity graphite Saprolitic deposit in Madagascar. Mining permit granted. Latest test results below.
Table 1: Concentrates from High and Low-Grade Composites
TC = Total Carbon by LECO, LOI = Loss on Ignition at 1000oC
Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7 1 SizeFraction High Grade Comp Low Grade Comp 2 Mass TC LOI Mass TC LOI 3 µm % % % % % % 4 500 28.4% 98.31 99.49 1.0% 98.52 99.04 5 300 21.3% 98.95 99.35 21.7% 98.52 99.04 6 180 15.4% 98.65 99.25 30.0% 98.92 98.63 7 150 6.6% 99.12 99.28 12.0% 97.29 98.36 8 106 7.0% 98.98 99.21 10.7% 97.11 98.44 9 75 6.0% 99.00 99.20 7.6% 98.17 98.31 10 -75 15.4% 96.53 96.27 17.0% 98.17 97.48 11 Calc Head 100.0% 98.37 98.88 100.0% 98.26 98.45
The flotation test work, based on a standard graphite process flowsheet developed by IMO, demonstrated that coarse high purity graphite flakes can be produced from this standard flowsheet. Photos of +500 µm from the high-grade concentrate shown in Figure 1 reveal flake dimensions to be often in excess of 2 mm.
Flotation testwork based on IMO's standard graphite process flowsheet resulted in a high-grade concentrate from both low and high-grade composites as shown in Table 1 following.
Figure 1: Micrographs of High Grade +500 µm Flake Graphite (picture 1 of 2)
Figure 1: Micrographs of High Grade +500 µm Flake Graphite (picture 2 of 2)
The process flowsheet included rougher flotation, followed by several regrind and cleaner flotation stages.​
High recovery of large flake (> 180 µm) was achieved from both high grade (65% mass) and low grade (53% mass) composites showing potential for recovery of high flake bearing premium concentrates throughout the deposit. Grades of each composite are as follows:
- High Grade Composite Total Carbon Head Grade = 15.7%
- Low Grade Composite Total Carbon Head Grade = 2.6%
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