Typically, small-scale mining operations lack mechanization, tools and safety measures to protect workers. The work exposes both adults and children to the risk of death and injury from tunnel collapses, accidental explosions, rock falls, exposure to toxic substances such as mercury and lead, and chronic health conditions such as silicosis. Dirty and dangerous conditions, combined with heavy loads and long hours of work, contribute to a vicious circle that increases the risks of accidents and disease.