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<p>The mining sector has become a major economic activity worldwide, and one that is well established in Cameroon (Central Africa). The various stages of this exploitation cause considerable damage to the environment and to human health. Soil contamination and mining discharges at the Ngoura locality gold panning sites were assessed by ICP-MS (Inductively Coupled Plasma Mass Spectrometer) measurements of metallic and radioactive trace elements. This study showed a disturbed environment without any restoration, with trace metal elements (TMEs) concentrations mg/kg ranging from 5000 to 100,500 for Fe; 6 to 115 for V; 8.5 to 288.9 for Cr; 37 to 1283 for Mn; 0.7 to 53.5 for Co ; 2.19 to 57.69 for Cu ; 0. 00001 to 85.267 for Ag; 0.01 to 50 Hg; 3.11 to 65.49 for Pb; 0.1 to 1445.7 for As; 1.1 to 476.3 for Th and 0.2 to 29.9&#xa0;mg/kg for U. These high TME concentrations at Ngoura sites highlight the wide variability of pollution indices. The enrichment factor (EF) displays extreme enrichment for Hg and Ag in some samples, and average for Cr, Mn, Th and U. Geo-accumulation index (Igeo) and contamination factor (CF) values indicate extreme Hg contamination. The pollution index values (PLI) of the studied samples are greater than one, indicating a progressive deterioration in soil quality. In addition, the studied materials at the Ngoura locality are contaminated with heavy metals and radioactive elements (Th and U). These mining wastes are exposed to air, rain, erosion and leaching, and could therefore contaminate ecosystems.</p>

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Assessment of pollution level in the Ngoura at the open-cast mining environment under high anthropogenic pressure (East- Cameroon, Central Africa)

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Yvests Briault Tchoukeu,
  • Léopold Ekengele Nga,
  • Natanael Tehna,
  • Moise Welba,
  • Jean Pierre Nguetnkam

摘要

The mining sector has become a major economic activity worldwide, and one that is well established in Cameroon (Central Africa). The various stages of this exploitation cause considerable damage to the environment and to human health. Soil contamination and mining discharges at the Ngoura locality gold panning sites were assessed by ICP-MS (Inductively Coupled Plasma Mass Spectrometer) measurements of metallic and radioactive trace elements. This study showed a disturbed environment without any restoration, with trace metal elements (TMEs) concentrations mg/kg ranging from 5000 to 100,500 for Fe; 6 to 115 for V; 8.5 to 288.9 for Cr; 37 to 1283 for Mn; 0.7 to 53.5 for Co ; 2.19 to 57.69 for Cu ; 0. 00001 to 85.267 for Ag; 0.01 to 50 Hg; 3.11 to 65.49 for Pb; 0.1 to 1445.7 for As; 1.1 to 476.3 for Th and 0.2 to 29.9 mg/kg for U. These high TME concentrations at Ngoura sites highlight the wide variability of pollution indices. The enrichment factor (EF) displays extreme enrichment for Hg and Ag in some samples, and average for Cr, Mn, Th and U. Geo-accumulation index (Igeo) and contamination factor (CF) values indicate extreme Hg contamination. The pollution index values (PLI) of the studied samples are greater than one, indicating a progressive deterioration in soil quality. In addition, the studied materials at the Ngoura locality are contaminated with heavy metals and radioactive elements (Th and U). These mining wastes are exposed to air, rain, erosion and leaching, and could therefore contaminate ecosystems.