Co-Exposure to Lead and Mercury among Artisanal Gold Miners

Main Article Content

S. Rabiu
M. G. Abubakar
D. M. Sahabi
M. A. Makusidi
A. Dandare


Background: Illegal mining pitch and metal ores processing sites are frequently seen in many parts of Nigerian communities. Gold ore processing is widespread in communities of Zamfara State. These activities produce significant amount of dust that pollute the environment.

Aim: The study was conducted to determine the extent of exposure to lead and mercury in artisanal gold miners in Bagega and Kawaye districts and Yargalma village of Anka and Bukkuyum Local Government Areas respectively.

Methods:  Seventy gold ore miners were recruited from twelve different mining or processing sites of the affected villages. Serum lead determination was carried out using Atomic Absorption Spectrophotometer (AAS Perkin Elmer, 6300 model USA) and mercury was determined by cold vapor atomic absorption spectrometry (Spectra-10 varian).

Results: The blood lead and mercury levels of the exposed individuals ranged between 15 – 561.2 µg/dl and 0.21 – 196 µg/dl respectively. Majority (75.7%) had blood lead levels beyond 45 µg/dl with average mean of 368.62±15.20 and mean blood mercury levels of 168.86±8.92 µg/dl. The blood lead and mercury levels were significantly (p<0.05) high in 16-30 age bracket compared to 0-15 and 31-45 age groups. Similarly, Individuals from Bagega village had significantly (p<0.05) high blood lead and mercury levels compared to Kawaye and Yargalma villages. The high blood lead and mercury levels recorded in this study are far above OSHA permissible limit (40 µ/dl) and are therefore a call for concern.

Conclusion: The results indicate the co-exposure to lead and mercury in the artisanal gold miners. The individuals in age bracket 16-30 years are at high risk of synergistic adverse health effects of lead and mercury toxicities. The exposed individuals require urgent medical attention for proper intervention and possible total withdrawal from the work.

Gold mining, exposure, lead, mercury, synergistic effect.

Article Details

How to Cite
Rabiu, S., Abubakar, M. G., Sahabi, D. M., Makusidi, M. A., & Dandare, A. (2020). Co-Exposure to Lead and Mercury among Artisanal Gold Miners. Asian Journal of Environment & Ecology, 11(3), 1-8.
Original Research Article


Lar U, Ngozi-Chika CS, Tsuwang K. Environmental Health Impact of Potentially Harmful Element Discharges from Mining Operation in Nigeria Ame. J. Environ Proct. 2014;3(6):14-18.

Rana MN, Tangpong J, Masudur Rahman MD. Toxicodynamics of lead, cadmium, mercury and arsenic-induced kidney toxicity and treatment strategy: A Mini Review. Toxicology Reports. 2008;5:704-713.

Losika K, Wiechula D, Korus I. Metal contamination of farming soils affected by industry, Environment. Int. 2004;30:159-165.

Edwards DP, Sloan S, Weng L, Dirks P, Sayer J, Laurance WF. Mining and the African Environment Conservation Letters. 2014;7:302–311.

Orisakwe OE, Jason LB, Sabina S, Judith TZ. Metal Pollution in Nigeria: A Bio-monitoring Update J Health Pollution. 2014;6:40-52.

Adebayo O, Eludoyin ATO, Temitope OO, Olusegun OA. Effects of artisanal gold mining activities on soil properties in a part of Southwestern Nigeria. Cogent Environ-mental Science. 2017;3:1305650.

Orisakwe OE. Environmental pollution and blood lead levels in Nigeria: Who is Unexposed? Inter J. Occp. and Environ Health. 2009;15(3):315-317.

Robert R, Susan S, Brad W, Jeanne W, Sue P, Marcene R, John V, Bert BL. Chronic environmental and occupational lead exposure and kidney function among African Americans: Dallas Lead Project II Int J Environ Res Public Health. 2018; 15:2875-2885.

Mani MS, Kabekkodu SP, Joshi MB & Dsouza HS. Ecogenetics of lead toxicity & its influence on risk assessment human and experimental toxicology. 2019;1-29.

Assi MA, Mohd Noor MH, Abd Wahid H, Mohd Yusof MS, Mohd Ali R. The detrimental effects of lead on Human and Animal Health. Veterinary World. 2016; 9(6):660-671.

Ma L, Jun-Yi L, Jia-Xin D, Jie Z, Feng-Lei J, Qi X . Toxicity of Pb2+ to rat liver mitochondria induced by oxidative stress & mitochondrial permeability transition Toxicol Res.2017;1(3):1-10.

Santuraki AH, Sulaiman MB, Babayo AU. Assessment of some heavy metalsin soil associated with automobile activities in selected areas of Gombe, Nigeria Bayero. J Pure & Appl Sci. 2018;11(2):247-251.

Lar U, Tsuwang K, Gusikit R, Mangs A. Lead and mercury contamination associated with artisanal gold mining in Anka, Zamfara State, North Western Nigeria: The Continued Unabated Zamfara Lead Poisoning. J Earth Sci. & Eng. 2013;3:764-775.

Blacksmith Institute Lead poisoning Crises in Zamfara, Nigeria; 2010.

CDC. Assessment of Blood Lead Level among Children Aged ≤ 5 Years-Zamfara State Nigeria; 2014.

Dooyema CA, Neri A, Lo YC. Outbreak of fatal childhood lead poisoning related to atisanal gold mining in Northwestern Nigeria. Environmental Health Persp. 2012;120(4):601-607.

Olufemi OA, Ahmed T, Matthias Mabel KA, Ifeoma NA, Abdulazeez M, Nasir U, Suleiman M, Muhammad A. High concentration of blood lead levels among young children in Bagega Community, Zamfara-Nigeria and the potential risk factor pan. African Med J. 2014;18(1):10-14.

Getso KI, Idris SH, Kabir S, Patrick MN, Gabriel P, Habib Y, Nasir SG, Akin O. Prevalence and determinats of childhood lead poisoning in Zamfara State, Nigeria J Health Pollution. 2013;6:1-9.

Fernandez FJ, Micro-method for lead determination in whole blood by atomic absorption with use of graphite furnace. Clin. Chem. 1975;21:558-561.

Ham GA. Determination of mercury in blood and urine by cold vapor AAS: Using the VGA-77.

Gebrie HA, Dejene AT, Argaw A. Elevated blood lead levels among unskilled construction workers in Jimma, Ethiopia J Occup Med & Toxicol. 2014;9(12):1-10.

Orisakwe OE, Nwachukwu E, Osadolor HB. Liver and kidney function tests amongst Paint Factory Workers in Nkpor, Nigeria Toxicology & Industrial Health. 2007;23:161-165.

Dioka CE, Orisakwe OE, Adeniyi FAA, Meludu SC. Liver and renal function tests in occupationally lead exposed artisans in mechanic village in Nnewi, Nigeria Int J Env Res & Pub Health. 2004;1:19-23.

United Nation Environmental Protection & United Nation Children’s Fund (UNEP-UNICEF). Information Series; 1997.

Hassan HA, Modawe G, Abdrabo A. Assessment of serum copper and lead in Sudanese cigarette smokers. Asian J Biomed & Pharmn Science. 2015;5(44): 30-32.

Occupational Safety & Health Administra-tion Permissible Exposure Limit Document; 2014.