lee barker al jazeera. >> state of emergency has been clay claired in the u.s. of colorado, more than 11 million leaders have been released from a gold mine in the local streams in the last week, and that is three times more than was previously thought. al jazeera returns to a place called door range go. >> that is what the river looks like as it flows through durango. on tuesday, pretty idellic, frankly, that's partly the problem, because we sue that neon toxic plume as it flows through here. last week, we also know what was in the that plume that heavy metal cocktail, of arsenic, zinc, led, and so on. we also know it left sediment behind as it moves along, what we don't know, do enter have any definitive answers or other authorities is what long term effects that will have or what the current toxicity is in this river right now. it may not have that weird yellow color, but that was with the iron, this perhaps one of the lost frightening of the metals i mentioned. the plume itself has moved further downstream, through towards new mexico, into utah, towards the