The Montana Bureau of Mines and Geology announced its 2017 Symposium will happen in October, 2017. It is billed as "a forum where professionals, students, and amateurs interested in mineralogy and economic geology can share knowledge about mineral occurrences in the northern Rocky Mountain Region." The announcement can be downloaded from this post. For more details visit: https://www.mbmg.mtech.edu.
The West Virginia Geological and Economic Survey provides an interactive map of underground and surface coal mining activity in West Virginia. The map shows areas of active and historical coal mining in both underground and surface mines, with separate colors for auger and highwall mining.
The Utah Geological Survey has produced an interactive map showing the locations of more than 450 abandoned coal mines in Utah. For over half of these, detailed maps of the individual mines are available for download and further use.