What was Kennecotts proposed method for dealing with the subsidence question?
First, geotechnical data from the mine site area indicates the integrity of the rock is such that the potential for subsidence – even the smallest amount – is very unlikely; however, Kennecott prefers to take a conservative approach to such issues by taking preventive measures through the design and engineering of the mine. In this case, Kennecott will mine from the bottom of the ore body up to a specific point below the top of the mine. At that point, additional geotechnical information will be gathered and engineering for completing the mining process will be submitted to the MDEQ for its review and approval. The MDEQ and its consultants agreed that this was the appropriate course of action and would ensure environmental protection and safety standards. Consequently, this approach was incorporated into draft permit conditions Section E (5), dated February 23, 2007.
