Assessing the Downstream Impacts of Soil Sedimentation Caused by Small- Scale Alluvial Mining in Atamo, Central Bougainville

Abstract

The sedimentation of soils resulting from small-scale alluvial gold mining poses major environmental and socio-economic problems for the communities concerned. This study examines the extent and consequences of soil erosion caused by mountain gold mining in the Atamo area of Central Bougainville, Papua New Guinea. Using qualitative methods, including field surveys, interviews with local communities, the study documents sediment accumulation in river basins, which has disrupted natural water flows, damaged infrastructure, and altered aquatic ecosystems. The issue is further exacerbated by the presence of climate change, where irregular and extreme rainfall events accelerate soil erosion and sediment transport from mining sites into waterways. Key findings show that sediment deposition has resulted in the diversion of rivers, road deterioration, and a deterioration of water quality for human consumption. The study also highlights the lack of awareness among miners about sediment management and the absence of formal mitigation strategies. The report concludes that soil sedimentation is a threat to environmental sustainability and hinders the livelihood and mobility of the communities concerned. The document recommends the introduction of effective erosion control measures, reforestation, and regulatory frameworks to manage mining practices and protect the ecosystems downstream.