(TSX-V: AGG) ("AGG" or the "Company") is pleased to announce the results of metallurgical test work and provide an update on the progress of the feasibility study.
The company completed additional metallurgical test work at Gekko Systems facilities in Ballarat and Bureau Veritas in Perth, Australia, as part of the Feasibility Study process. This work confirms the results established in test work completed in 2014. Overall metallurgical recovery of gold was found to be 80% using the flow sheet established in the previous work.
A 92 kg sample of ore, assaying 0.92 g/t, was initially washed (a process known as scrubbing) and then wet-screened over a 1.18mm screen. The screen oversize represents 20% of the mass, and contained 49% of the gold at a grade of 2.31 g/t. The screen undersize represented 80% of the feed, had a grade of 0.58 g/t. The screening process provided a significant upgrade of the oversize, which was then crushed to below 1.18mm, and combined with the gravity feed to the gravity concentration process.
TORONTO, CANADA, – African Gold Group, Inc. ("AGG" or the "Company") (TSX VENTURE:AGG) is pleased to announce that a team of engineers, under the direction of Bumigeme Inc., has completed the metallurgical test work associated with processing a total of 128 composite reverse circulation ("RC") drill intervals that emulate the Kobada deposit from surface down through to fresh bedrock. All samples are compiled from Reverse Circulation ("RC") drill cuttings that represent between 30 meters and 50 meters of drill intercepts, derived from one or more holes, within a specific horizon or layer of mineralization, within the deposit. Each of the processed samples weighed between 0.8 to 1.5 metric tonnes. The longer the drill intercept(s) for a given sample the greater the weight of the respective sample.
A total of 500 samples had originally been identified by AGG's technical team for processing through a fully constructed and commissioned pilot plant. The plant, specifically designed for metallurgical research, has a capacity throughput of up to 2 tonnes per hour.
Metallurgical Engineers, onsite at Kobada, have reached a consensus that further testing of composite bulk samples of RC drill intercepts, beyond the 128 samples just completed, would be redundant. Essentially, the 128 processed samples represent testing the Kobada deposit over 800 meters of drilled strike length from surface through the oxidized profile measuring approximately 100 vertical meters in depth, into fresh bedrock.
Significantly, the average grade of the 128 sample population that has just been processed through the gravimetric pilot plant was approximately 0.4 g/t Au, based on Leachwell given grade. Furthermore, 75 of the 128 sample population, representing 59% of the total sample population, had a grade that was less than 0.3 g/t Au or below cutoff grade and therefore classified as waste material, based on sample support derived from RC drilling and lab results based on 2 kg Leachwell analysis.
African Gold Group, Inc., (“AGG” or the "Company”) is pleased to announce that a team of engineers, under the direction of Bumigeme Inc., is mobilizing to depart Canada, en-route to Mali, West Africa, with the specific objective of commencing and completing the metallurgical test work for AGG’s Kobada gold project. Completion of the metallurgical test work represents an important phase of work that is essential to concluding AGG’s Feasibility Study for a 1,500 tonne/day gravity (gold recovery) plant for Kobada.
A total of 500 samples have been identified by AGG’s technical team for processing through a fully constructed and commissioned pilot plant. The plant, specifically designed for metallurgical research, has a capacity throughput of up to 2 tonnes per hour. Each of the 500 samples will weigh between 1 to 1.5 metric tonnes. All samples are compiled from Reverse Circulation (“RC”) drill cuttings that represent between 30 meters and 50 meters of drilling, derived from one or more holes, within a specific horizon or layer of mineralization, within the deposit. The longer the drill intercept(s) for a given sample the greater the weight of the respective sample. AGG’s Pilot Plant - onsite at Kobada, Mali.
African Gold Group, Inc. (TSX VENTURE:AGG) ("AGG" or the "Company") is pleased to announce the completion of drilling for the 2014 field season at Kobada, Mali. This body of work has resulted in the successful collection of over 2.4 tonnes of lateritic and saprolitic material that is representative of the Kobada ore types.
The final drilling was completed subsequent to the incident that was reported in the Company's press release of July 9, 2014. AGG wishes to acknowledge the continuing support of the Government of Mali and their ongoing efforts to curtail illegal mining activity, throughout the entire country, during the rainy season, in accordance with Mali law. This support has allowed the Company to continue its planned work program through to completion.
Officials representing the Canadian Embassy in Mali continue to be most helpful in providing the Company with advice and support, as well as, intervening at the highest levels of the Mali Government on the Company's behalf. AGG wishes to express its gratitude for the continuing initiatives.
Importantly, 1.8 tonnes of sample material has been air-freighted to Australia for the commencement of metallurgical testwork. The balance of the material is being stored in Mali pending initial results of the testwork. The remainder of the sample material, which is packaged and ready for transport, will be sent to Australia via air-freight, should additional material be required.
African Gold Group, Inc., ("AGG" or the "Company") is pleased to report the analytical results for the first 50 bulk metallurgical test samples that were comprised of composites of reverse circulation (“RC”) drill intervals that were specifically selected to emulate the Kobada deposit, from surface down through to fresh bedrock.
Each bulk sample consisted of drill cuttings from one or more RC drill holes, within a specific horizon or layer of mineralization emanating from drill intervals that ranged between 30 to 50 meters in length and weighed between 0.8 up to 1.5 metric tonnes.
Average calculated gold grades of the 50 individual bulk composite samples, processed through the gravimetric pilot plant, yielded gold grades 65% higher than the average given gold grade, based on 2 kg Leachwell analysis, from the identical drill interval.
28 of the 50 bulk composite samples were classified as waste, averaging 0.085 g/t Au, based on 2 kg leachwell analysis, of the drilled interval(s). The calculated average grade of the bulk samples processed through the gravimetric pilot plant, for the identical drill interval(s), averaged 0.299 g/t Au, representing a 252% increase in gold content from the identical drill interval(s).
Pilot plant test results continue to confirm that increasing “sample support” (volume of material) and “aliquot” (the actual amount of material analyzed) is highly beneficial for improving the overall grade of mineralization of the Kobada deposit, a characteristic of the “nugget effect.”
Pilot plant test results continue to confirm that a Bulk Mining model applies to Kobada and that all material contained within the (mineralized) structural corridor is envisioned to be processed through a gravimetric gold recovery plant – including material that is defined as waste, based on drill sample support and Leachwell analysis.