June 1, 2012 (Source: Archer Exploration Limited) – Highlights
- A composite RC sample from Campoona hole CSRC12_006 has produced large, medium and fine flake with most in the medium flake range.
- The results are considered a minimum result as the samples received by the laboratory were finely pulverised by the drilling method with 97% passing 2mm. The samples as received already had 80% passing 220 micron thus making it potentially unsuitable for the recovery of flake graphite. Despite the limitations of the sample large, medium and fine flake graphite was recovered.
- Mostly medium and fine flake was recovered with lesser large flake. Flake grades of 91%TGC achieved. Acid wash results are pending.
- Test work will continue over the coming months based on trench and diamond drill samples and will involve several iterations of grinding and flotation regimes. Focus will be on developing the optimum process flow sheet to meet the desired marketing strategy of maximizing flake size and purity.
- Separate samples of Campoona graphite were crushed to 35μm to determine if high value amorphous graphite could be produced. High grade amorphous powder grading >99%TGC commands a price of US$35,000 per tonne. Results using conventional flotation were extremely encouraging and indicate that high purity, high value concentrate can be readily produced.
o CSRC12_003 : 92%TGC Concentrate & 98% recovery.
o CSRC12_006 : 93%TGC Concentrate & 92% recovery.
Archer Exploration Limited (“Archer”) advises that initial metallurgical test work results from Campoona drill samples drilled in February and April 2012 have been received.
The Company’s 100% owned Campoona Graphite Project is located approximately 12km north of the township of Cleve on Eyre Peninsula, South Australia.
Drilling by the Company in February and in April 2012 (Figure 1) confirmed the presence of visible flake graphite within a discrete intense graphitic shear zone hosted in low grade graphitic proto-gneiss (high grade metamorphosed sediments). The high grade graphite unit averages 10-50m in true width with the hangingwall section particularly high grade averaging over 15% graphitic carbon and carrying visible flake.
The full news release is available here.