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A mill worker swirls crushed rocks around a wooden pan. If done correctly, the heavier gold dust will settle in the centre of the pan, partially separating it from the valueless rock particles, on April 23, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280861 )

A miner stands in a mountain-side mining camp in his underwear, having just washed the tunnel mud off himself during their midday break, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487281019 )

Miners gather around to watch a haircut in their mountainside camp at the end of a day's work, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280805 )

A 14-year-old miner enters a dark tunnel after taking a short break. (Photo by Luc Forsyth/Getty Images) ( 487280845 )

Gold miners use a sledgehammer to free raw ore from the tunnel walls before hauling it to processing stations on the surface, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280835 )

Gold miners wash their muddy hands in the drip-water falling from the ceiling of an active tunnel. Water continuously leaks through the cracked stone walls of the tunnels and the miners are soaked all day, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280851 )

Miners break large rock fragments into more manageable pieces using sledgehammers and anvil stones, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487281031 )

Mill workers move buckets of crushed ore before washing it and adding liquid mercury in order to separate the gold particles from the valueless rock, on April 23, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487281049 )

A miner takes a bucket-shower at the end of a day of digging on April 23, 2014 in Pinut-An, Philippines. The tunnels are wet and muddy, and the miners shower several times a day to stay clean, on April 23, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280819 )

Miners sleep during a midday break from work, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280837 )

A 14-year-old gold miner styles his hair at the end of a day of mining, on April 23, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487281045 )

Gold miners and their family eat dinner together in a small house built near their mountainside camp. Many miners have homes in the nearby village of Pinut-An, but stay in the mountain camp to be closer to their tunnel, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280993 )

Mine owner Gil Mercado, 70, uses a pocket calculator to check the value of his most recent batch of harvested gold. He sells the gold for less than $30 per gram, well below market value, on April 23, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280815 )

Mine owner Gil Mercado, 70, heats a lump of gold using a blowtorch on April 23, 2014 in Pinut-An, Philippines. All excess water must be evaporated so the gold can be accurately weighed, on April 23, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280853 )

A miner lights a Jackpot menthol cigarette from the tip of another. The miners smoke heavily in the tunnels, and the air is thick with second hand smoke. They exclusively smoke Jackpot menthols because they are cheaper and last longer than other cigarettes, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280823 )

A miner hauls a bag of raw ore out of the tunnels to the processing station on the surface, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487280843 )

A gold miner celebrates the end of a work day as he walks towards his home, on April 22, 2014 in Pinut-An, Philippines. (Photo by Luc Forsyth/Getty Images) ( 487281001 )