CGM. Large flake, high purity graphite Saprolitic deposit in...

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

1. 	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

   TC = Total Carbon by LECO, LOI = Loss on Ignition at 1000oC
   
   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.
   
   
   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.​​
   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.
   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%