Inside Story - Nigeria's illegal miners

At least 160 people have died in Northern Nigeria, and this number is likely to increase as villagers continue to expose themselves to lead poisoning from illegal gold mining. The discovery of a gold deposit triggered a "gold rush" among impoverished farmers who dug up rocks by hand, unaware that the ore contained dangerously high concentrations of lead. Nigerian authorities have asked for assistance from various international agencies, including the World Health Organisation, to help contain the outbreak. But the Nigerian government has not stepped in to curb the illegal mining. It is reported that at least 111 of those killed were children, many of them under the age of five. Inside Story asks: Just why do these people run this risk? How does it impact the environment? And what can governments do to stop illegal mining?