This article looks into mining in central Germany in the late eighteenth century as one area of highly charged exchange between science and the state. It describes bureaucratic knowledge as socially distributed cognition by following the steps of a high-ranking official that led him to discover a rich silver ore deposit. Although this involved hybridization of practical/artisanal and theoretical/scientific knowledge, and knowers, the focus of this article is on purification or boundary work that took place when actors in and around (...) the mines consciously contributed to different circuits of knowledge production. For the sake of analysis, the article suggests a way of opposing bureaucratic versus scientific knowledge production, even when the sites, actors involved in, and practices of that knowledge production were the same or similar. Whereas the science of the time invoked consensus among equals to conflate competing knowledge claims, bureaucracies did so by applying a hierarchy among ranked individuals. (shrink)