By Joe Dase MTU Mining Engineer on Monday, November 15, 2004 - 09:26 pm:
Dave- I don't want to come off as a jerk but that figure would be ok assuming that all of the copper is leached into the water. If your assumption was correct, most everyone would be dead due to the copper in our water pipes, also the steamer Pewabic would be responsible for contaminating millions of gallons of water in Lake Huron (Correct me if it didn't sink in Huron). Now, I can write for a long time on tailings placements and the benefits/disadvantages of placement but Ill spare you boring reading. Most of the heavy metal contamination elsewherein the country/world is due to the production of acids, etc that dissolve the metals into solution, that doesn't exist here. The point is people tend to 'cry wolf' when they don't always know the facts, and the mining industry usually gets blamed, and maybe rightly so, however copper tailings here are not a significant environmental issue, I would be more worried about the lamprey than population collapse of benthic orgasims .
By Paul in Illinois on Monday, November 15, 2004 - 09:59 pm:
Hunderds of kids have played in the pools at the mouth of Eagle River over the past century or so. Eagle River and its tributaries flow through stamp sands from the Cliff, Central, and Phoenix mills. The latter being just a mile upstream. The reservoir behind the Eagle River dam is almost filled with stamp sand. Trees are growing all along the river, and no one has suffered any ill effects that are recorded to my knowledge.