Snowden is a respected consulting company serving the mining industry in Australia and North America.  Here is a link to papers & publications on mining and related to mining by Snowden staff.   Scroll through the list of titles and click the pdf link for a pdf of the paper.  Most of the papers are old, but informative. There are no papers from 2008 and only one from 2007, so they must have been working hard on consulting with no time to write papers.  Still you may find a classic in your topic.