article · Discover Chemistry.
An assessment of stream sediments in Manjo and surrounding areas in Cameroon reveals significant concentrations of multiple metals, including iron, lead, mercury, zinc, copper, nickel, and uranium. Analysis using inductively coupled plasma mass spectrometry shows that several elements exceed upper continental crust geochemical thresholds, pointing to potential base metal mineralisation. Evaluating the sediments through pollution and toxic risk indices highlights severe contamination and notable ecological risks. These levels indicate toxicological stress and potential harm to aquatic flora, fauna, and sediment dwelling organisms. The sediments originate from weathered mafic and quartzose sedimentary sources deposited in non marine environments, with both natural geological processes and human activities driving metal enrichment. Managing these risks will require targeted monitoring of human generated inputs alongside consideration of natural lithological contributions.
Understanding stream sediment composition helps identify both economic mineral deposits and dangerous environmental contamination. The high toxicity and ecological risks discovered in this aquatic ecosystem highlight a threat to local flora and fauna. By distinguishing between natural geology and human pollution, environmental authorities can better target remediation efforts and protect freshwater resources.
This work represents early stage geochemical exploration data that could assist mineral exploration companies targeting base metal prospects in Cameroon. It also provides baseline environmental data useful to environmental monitoring agencies and consulting firms designing pollution abatement programmes. However, real world commercial mineral extraction or environmental intervention remains at an exploratory, pre feasibility stage.
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This study seeks to evaluate stream sediments for metal exploration, pollution and ecological implications using single and cumulative pollution indices in the light of recent discoveries. The concentration of metals in stream sediments of Manjo and environs was evaluated using inductively coupled Plasma-mass spectrometry. The sediment samples exhibit high concentrations for Fe, Pb, Hg, Ga, Zn, Cr, Cu, Co, Ni, V, Sn, Ce, La, U and Th when compared with the geochemical threshold values of upper continental crust (UCC), indicating some strong anomalies for potential base metal mineralization and exploration implications. The single and cumulative pollution indices suggest sediment contamination severity and metallic pollution. Potential ecological risk index (RI: 17.682–457.791) and toxic risk index (TRI: 2.243–29.981) indicate high ecological and significant toxicity risks, suggesting biological effects of metals to sediment-dwelling organisms. Sediment quality guidelines suggest high toxicological impacts and response stress of metals (Pb, Cu, Cr and Ni) to the aquatic ecosystem flora and fauna. Natural versus anthropogenic input origins are ressponsible for sediments enrichment in base metals and metallic pollution in the study area. The sediments are sourced from mafic and quartzose sedimentary provenances and mainly deposited in a non-marine environment. In addition, the sediments are mature and display moderate to intense weathering and rich mostly in quartz. According to this research, there should be more focus on monitoring the point sources of metals entering aquatic environment from human-induced activities to abate the anthropogenic inputs. Commitment to research and the implementation of science-based strategies will be crucial in ensuring the ecological sustainability of the water sediments’ environment. More so, note is taken of the natural lithological contributions to the sediment geochemistry having implications for future mineral exploration ventures.
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DOI: 10.1007/s44371-025-00183-2
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