The centuries-old Osun-Osogbo Festival is facing growing environmental and health concerns as pollution linked to gold-mining activities upstream continues to affect the sacred Osun River in Osun State.
The river, which runs through the 75-hectare Osun-Osogbo Sacred Grove, a UNESCO World Heritage Site, was reportedly visibly discoloured during this year’s festival. The river is central to the annual celebration dedicated to Osun, the Yoruba river goddess, and attracts worshippers, tourists and visitors from Nigeria and the Yoruba diaspora.
The pollution is reportedly linked to mining activities that intensified upstream around 2018. Campaigners say runoff from artisanal and other mining operations carries sediments and potentially toxic substances into the river. Independent testing commissioned by environmental advocacy group Urban Alert in 2021 reportedly detected unsafe levels of lead, mercury and cyanide in samples collected from different locations along the river.
The development has raised particular concern because some devotees traditionally drink or bathe with water from the Osun River as part of their spiritual practices. Despite warnings about the water’s safety, some worshippers continued to use it during the festival, reflecting the deep religious and cultural significance attached to the river.
Environmental advocates have accused authorities of taking insufficient action to address the problem. Although some mining sites have reportedly been shut and miners arrested, campaigners say there has been no comprehensive remediation programme or independent confirmation that the river has returned to safe conditions. They are calling for authorities to identify and map the full extent of the contamination and immediately stop mining activities responsible for further pollution.
Experts have also warned that the consequences extend beyond human health. Heavy metals can remain in river sediments, accumulate in fish and aquatic vegetation and move through the food chain, potentially damaging biodiversity and affecting communities that depend on the river ecosystem for their livelihoods.
The situation has therefore become both an environmental and cultural heritage crisis. Campaigners are urging the Federal Government, Osun State Government and relevant regulatory agencies to strengthen enforcement against illegal mining, conduct comprehensive water-quality assessments and implement a properly funded clean-up programme. They warn that while gold deposits can continue to be exploited, the ecological and spiritual character of a cultural landscape that has existed for centuries may be extremely difficult to restore once permanently damaged.