Mine parks are a late twentieth-century addition to the global heritage repertoire. To date, most studies of visitor experiences at mining heritage sites focus on tourists who appreciate their outings. Yet mine parks do not satisfy all those who visit. What goes wrong for those who visit these destinations and feel disappointed, and how do they express their displeasure? We answer this question by scrutinising the online negative reviews of tourists from seven Chinese national mine parks. Our analysis indicates ‘disgruntled tourists’ want the sites of former resource extraction to include a sight and meet their expectations for hospitable, accessible, and knowledgeable service. When mine parks fail to deliver, they become disappointed, dissatisfied, and angry. They overwhelmingly articulate their unhappiness using a language of ‘lack’ or deficiency and talking about ‘value for money’. The reviews further suggest that disappointed visitors write online reviews to vent negative emotions, warn other tourists, and punish site staff. Drawing on the broader literature on mining tourism, heritage tourism, and visitor experiences, we indicate strategies that mining heritage professionals could use to remedy disgruntled tourists’ sense of deficiency, while also contributing to scholarly discussions about what makes tourism meaningful.