Photos: At PolyMet, ramping up to mine copper

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1 A rod mill inside the concentrator building Thursday, Oct. 10, 2013 at the PolyMet facility near Aurora, Minn. The rod mills are machines filled with rods of various size that are used to further crush rock during the extraction process. 
2 PolyMet CEO Jon Cherry talks about the condition of infrastructure inside the concentrator building on Thursday, Oct. 10, 2013 near Aurora, Minn. 
3 A view inside PolyMet's concentrator building Thursday, Oct. 10, 2013 at near Aurora, Minn. 
4 This field and lake are built on top of old tailings from the LTV Taconite mine as seen on Thursday, Oct. 10, 2013 at the PolyMet mine near Aurora, Minn. Plans are in the works that would cover this field with new tailings and waste rock from a new mining operation. 
5 Swans swim through an artificial lake left behind after mining operations ceased at LTV Taconite Thursday, Oct. 10, 2012 at the Polymet mine near Aurora, Minn. 
6 The concentrator building stretches for almost a half mile Thursday, Oct. 10, 2013 near Aurora, Minn. 
7 The road leading to PolyMet as seen Thursday, Oct. 10, 2013 near Aurora, Minn. 
8 A reverse osmosis machine owned and developed by PolyMet operates in a test facility Friday, Sept. 27, 2013 in Virginia, Minn. The device will clean water coming from the mine site. 
9 Clean water exits a reverse osmosis machine owned and developed by PolyMet operates in a test facility Friday, Sept. 27, 2013 in Virginia, Minn. The device will clean water coming from the mine site. The water coming out of these machines is so clean that minerals and other additives need to be put into it. 
10 A rock alongside a highway near Ely, Minn. shows evidence of copper mineralization Friday, Sept. 27, 2013. 
11 Dean Peterson (right), Senior Vice President for Exploration at Duluth Metals, inspects a rock handed to him by Duluth Metals Senior Geologist Phil Larson Friday, Sept. 27, 2013 near Ely, Minn. The rock showed signs of the mineralization that companies like Polymet, Duluth Metals and more are looking to capitalize on in the coming years. 
12 Dean Peterson, Senior Vice President for Exploration at Duluth Metals, stands next to the cover to a test shaft sunk by International Nickel Company Friday, Sept. 27, 2013 near Ely, Minn. The shaft was sunk decades ago into the Maturi copper nickel deposit. While all that is visible is a small cap, it widens into a much larger shaft that can fit a person just a few feet underground.