As the river reaches Itogon municipality, cyanide and mercury from the various mines and hundreds of pocket miners seep to the river. A Japan International Cooperation Agency study in 1990 showed that at Lingayen Gulf, Pangasinan, the delta of Agno, shellfishes have trace deposits of cyanide and mercury.
Mercurial and cyanide poisoning cause weakening of the human body, and these are characterized by symptoms coughing, vomiting, reddening of eyes, nausea and difficulty of breathing, said the Dr. Charles Cheng, a noted medical researcher and director of the Baguio-based Chinese-Filipino General Hospital.
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