Based on the available literature, congenital deformities are associated with exposure to mercury, lead other heavy metals (see Table 1, below). These metals are non-biodegradable and tend to bio-accumulation in the food chains. Exposure to cocktails of these heavy metals may exacerbate the problem even at lower concentration. Cyanide dissolves heavy metals from the ores and releases them into rivers and underground water bodies. Cyanide-sulfur-acid water seeps through underground and dissolves rocks and release these heavy metals to toxic levels.
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