Back
 GEP  Vol.8 No.7 , July 2020
Geochemical CompGeochemical Comparison of Fresh and Weathered Tailings from the Sabodala Gold Mine Kedougou Region, Senegal Following 6 Years of Operationarison of Fresh and Weathered Tailings from the Sabodala Gold Mine Kedougou Region, Senegal Following 6 Years of Operation
Abstract: The Sabodala gold mine is located in the Kedegou region in eastern Senegal near the border with Mali in a tropical Savannah climate zone with distinct wet and dry seasons. The mine has been operating since 2009 with active tailings deposition giving an ideal opportunity to study the weathering characteristics of carbonate rich tailings materials under real world conditions. The mine is operated in accordance with international best practice with regular monitoring of water quality and tailings chemistry in accordance with the international cyanide management code (ICMC) and also in order to monitor and control any potential impacts from Acid Rock Drainage and Metal Leaching (ARDML) that may be generated from the tailings materials and waste rock. In 2015 as part of a project looking at the potential for re-use of generated tailings as construction materials, a number of additional geochemical tests including whole rock assays, mineralogy, Acid Base Accounting in accordance with modified Sobek method with siderite correction, together with paste pH and electrical conductivity (Ec) measurements were undertaken. The purpose of the study was to update the predictions of the potential for ARDML generation and drainage pH in leachates forming from the Sabodala tailings. The tests were run on one composite weathered and 3 selective fresh samples collected by auger drilling on three holes over the tailing. Results have enabled a better understanding of the chemical weathering characteristics of finely ground tailings materials under tropical weathering conditions and the nature of secondary minerals precipitated.
Cite this paper: Dia, I. , Diagne, M. , Gueye, M. , Barnes, A. and Mace, C. (2020) Geochemical CompGeochemical Comparison of Fresh and Weathered Tailings from the Sabodala Gold Mine Kedougou Region, Senegal Following 6 Years of Operationarison of Fresh and Weathered Tailings from the Sabodala Gold Mine Kedougou Region, Senegal Following 6 Years of Operation. Journal of Geoscience and Environment Protection, 8, 177-194. doi: 10.4236/gep.2020.87010.
References

[1]   Chirwa, T. (2015). ALS Minerals Report No. ALSCR-15-07.

[2]   Gao, S., Xu, H., Zhang, D., Shao, H., & Quan, S. (2015). Ore Petrography and Chemistry of the Tellurides from the Dongping Gold Deposit, Hebei Province, China. Ore Geology Reviews, 64, 23-34.
https://doi.org/10.1016/j.oregeorev.2014.06.010

[3]   Gueye, M., Ngom, P. M., Diène, M., Thiam, Y., Siegesmund, S., Wemmer, K., & Pawlig, S. (2008). Intrusive Rocks and Tectono-Metamorphic Evolution of the Mako Paleoproterozoic Belt (Eastern Senegal, West Africa). Journal of African Earth Sciences, 50, 88-110. https://doi.org/10.1016/j.jafrearsci.2007.09.013

[4]   Hirdes, W., & Davis, D. W. (2002). U-Pb Geochronology of Paleoproterozoic Rocks in the Southern Part of the Kédougou-Kénieba Inlier, Senegal, West Africa: Evidence for Diachronous Accretionary Development of the Eburnean Province. Precambrian Research, 118, 83-99. https://doi.org/10.1016/S0301-9268(02)00080-3

[5]   Klein, C., & Hurlbut, C. S. (1998). Manual of Mineralogy (21st ed., 681 p.). Hoboken, NJ: John Wiley and Sons Inc.

[6]   Ledru, P., Pons, J., Milési, J. P., Feybesse, J. L., & Johan, V. (1991). Transcurrent Tectonics and Polycyclic Evolution in the Lower Proterozoic of Senegal-Mali. Precambrian Research, 50, 337-354.
https://doi.org/10.1016/0301-9268(91)90028-9

[7]   Mason, B., & Moore, C. B. (1982). Principles of Geochemistry (4th ed., 344 p.). New York: John Wiley and Sons.

[8]   NF EN ISO 14688-1 (2003). Geotechnical Investigation and Testing—Identification and Classification of Soil—Part 1: Identification and Description.

[9]   NF P 94-056 (1996). Soil: Investigation and Testing—Granulometric Analysis—Dry Sieving Method after Washing.

[10]   NF P 94-057 (1992). Soil: Investigation and Testing—Granulometric Analysis—Hydrometer Method.

[11]   Peel, M. C., Finlayson, B. L., & McMahon, T. A. (2007). Updated World Map of the Köppen-Geiger Climate Classification. Hydrology and Earth System Sciences, 11, 1633-1644. https://doi.org/10.5194/hess-11-1633-2007

[12]   Price, W. A. (2009). Prediction Manual for Drainage Chemistry from Sulphidic Geologic Materials, MEND Report 1.20.1 (579 p.).

[13]   Rhys, D. (2010). Report on May 2010 Geological Work at the Sabodala Mine (35 p.). Surrey: Panterra Geoservices Inc.

[14]   Sobek, A. A., Schuller, W. A., Freeman, J. R., & Smith, R. M. (1978). Field and Laboratory Methods Applicable to Overburdens and Minesoils (204 p.). Environmental Protection Technology Series.

[15]   Stephenson, P. R., Shannon, J. M., O’Connor, B., Riles, A., & Ebrahimi, A. (2010). Sabodala Gold Project, Senegal, West Africa: Technical Report for Teranga Gold Corporation.

[16]   The International Network for Acid Prevention (INAP) (2009). Global Acid Rock Drainage Guide (GARD Guide).
http://www.gardguide.com

[17]   TROPICA Environmental Consultants (2006). Projet d’Exploitation d’Or, d’Argent et de Substances Connexes a Sabodala de SMC: Etude d’Impact Environnemental et Social (186 p.).

 
 
Top