ge problems that date back to mining that the Romans did. So yeah, this is centuries of problems," said Eger. "Today there are existing, stringent rules and laws in place before you begin to mine...so you don't end up with centuries old problems they had in Roman times," Cherry said. These days the MPCA continually monitors the Dunka site and state reports indicate that recent testing shows little quantifiable environmental impact at the site. "Have been treating drainage at that facility successfully for, this is their 20th year," Eger said. There are several companies looking to open copper-nickel mines in the Duluth Complex with PolyMet being the closest to getting the permits needed to begin operations. The scientists say the lessons learned at the Dunka mine are being put to good use as they work to make sure the environment is protected at the proposed new mine sites. Barbara will talk more about those protective steps tomorrow.