This presentation will demonstrate the development and use of the Bad River Watershed Wikimap, an online participatory mapping application for an area of northern Wisconsin where new mining has been proposed. The issue of mining has drawn a great deal of recent interest and debate statewide. Different sides of the debate emphasize differing sets of landscape values, the symbolic meanings and instrumental uses that people associate with certain places. Online participatory mapping can inform difficult or contentious land use decision-making by using volunteered geographic information, a form of public input, to reveal where different landscape values exist. The Bad River Watershed Wikimap provides a case study designed as part of a master’s thesis project.