Multiple use, as pertaining to public lands, is a term used incorrectly by almost everyone, including people representing conservation organizations.
Multiple use, by statute, is stated as "a sustained yield of outdoor recreation, range, timber, watershed, wildlife and fish," with no use being above another. You don't "release" land such as a wilderness study area for multiple use. Wilderness study areas are already being used for at least three of the five multiple uses.
Logging is not "multiple use." It is just one of the five legally stipulated uses. In an area that is mined, the mining itself is not sustainable and the legally stipulated multiple uses are not preserved, so mining is not listed as one of them.