This concession is dominated by Proterozoic Birmian rocks which consist of turbidite facies sedimentary sequences. There are essentially two kinds of gold deposits that occur in the Siguiri basin: laterite or CAP mineralization and in situ quartz vein-related mineralization. The first appears as aprons of colluvial or as palaeo-channels of alluvial lateritic gravel adjacent to, and directly above, the latter. The quartz vein-related mineralization is hosted in meta-sediments with the better mineralization associated with vein stockworks that occur preferentially in the coarser, brittle siltstones and sandstones. The mineralized rocks have been deeply weathered to below 100m in places to form saprolite or SAP mineralization. AngloGold Ashanti had Mineral Resources of 67.49Moz and Ore Reserves of 21.62Moz on 31 December 2009 in the continental African region. Of these, Siguiri accounted for Ore Reserves of 3.25Moz and Mineral Resources of 5.94Moz.
AngloGold Ashanti holds an 85% interest in Siguiri, with the remaining 15% held in trust for the nation by the government of Guinea. Siguiri is contractor-mined using conventional open-pit techniques. The area has significant gold prospectivity and exploration potential. Project Status: Better than expected production was achieved at Siguiri during 2007. Total production was up 9% to 280,000oz compared with 256,000oz the previous year. Construction of the Siguiri combination plant was successfully completed in March 2019, and commissioning of the different sections of the plant is underway. The CIL circuit was commissioned in July 2018 and the first gold from it was poured in August 2018. The 30MW power plant was commissioned in October 2018. It is now fully operational providing reliable, low-cost power to the Siguiri mine. The crushing and milling circuits for the treatment of the hard sulfide ore are currently being commissioned and full ramp-up is expected in the first half of 2019. The focus for the coming year will be to stabilize plant throughput and operating stability as the new plant is commissioned. Exploration drilling continued at Saraya and Foulata to support a pre-feasibility study for the Block 2 permit area. This study is due to be completed during 2019 and is aimed at improving the mine’s ounce profile from 2020 onwards and potentially extending the life of the mine. The current option on the Siguiri Block 2 considers the trucking of oxide material to the existing process plant to displace marginal ore. The evaluation of this has been completed. Available
Physical and chemical properties
Good accessibility by road. The Siguiri gold mine is found within the Siguiri District in the northeast of the Republic of Guinea, West Africa, about 850km from the capital city of Conakry. The nearest important town is Siguiri (approximately 50,000 inhabitants), located on the banks of the Niger River. Bamako, the capital of Mali is 300km away.
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