Acid-base accounting test as a tool for prediction of mine drainage acid risk at a still functional mine site: Case of Draa Sfar Mine in Marrakech (Morocco) | ||
| Pollution | ||
| دوره 10، شماره 3، تابستان 2024، صفحه 929-940 اصل مقاله (688.57 K) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/poll.2024.371478.2231 | ||
| نویسندگان | ||
| Yassir Barkouch* 1؛ Sana El Fadeli2 | ||
| 1Research Laboratory of Applied Sciences for the Environment and Sustainable Development, Higher School of Technology of Essaouira, Cadi Ayyad University, Km 9, Route of Agadir, Essaouira Aljadida BP.383, Essaouira, Morocco | ||
| 2Higher Institute of Nursing Professions and Health Technology, ISPITS - Essaouira - Morocco | ||
| چکیده | ||
| The release of heavy metals from functional mines can result in significant environmental pollution, posing a threat to both soil and water quality. Therefore, it is crucial to characterize the chemical and physical properties of mine tailings to assess the potential risk of toxic heavy metal mobility in the environment. In this study, the chemical forms of Cd, Cu, Pb, and Zn in the tailings of Draa Sfar mine in Marrakech (Morocco) were investigated using standard sequential extraction and Atomic Absorption Spectrophotometric techniques. Results indicate that mining residues exhibit a highly acidic pH (2.9), low carbonate content (0.5%), and high electrical conductivity (7.2 mS/cm) due to significant soluble salts, particularly sulfates (3.7%). Assessing metal speciation indicated Cd's high availability in short-term mobile fractions (42%), while Cu primarily associated with soluble and exchangeable fractions (32%). Pb showed strong association with long-term mobile fractions (61%), and Zn displayed an equal distribution among mobile and lithogenic fractions. Acid-base accounting test results reveal a lower Neutralization Potential (196.4t CaCO3/kt) compared to Acid Potential (306.3t CaCO3/kt), indicating a negative Net Neutralization Potential and suggesting potential acid mine drainage. This result demonstrates that DraaSfar mining residues possess a lower acid-consuming capacity, primarily driven by their carbonate content, compared to their acid-generating capacity. This finding indicates that these mining residues have the potential to become sources of acid mine drainage, and underscore the importance of implementing sustainable mining practices and mitigation strategies to reduce environmental impact. | ||
| کلیدواژهها | ||
| Acid-base accounting؛ Acid mine drainage impact؛ Draa Sfar mine taillings؛ Marrakech؛ Metallic trace elements | ||
| مراجع | ||
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