Abstract:The burnt rock is a kind of metamorphic rock produced by the influence of burnt metamorphism and pneumatolytic metamorphism under the complicated conditions with the coalfield fire area as the main environmental background. At present, the research focuses on the properties and hydrogeological significance of the rock formations in the extinct fire area, but lacks the research in the active fire area. In order to promote the study of burnt rock, this paper analyzes the mineral composition and coloration of burnt rock by taking sandstone as an example. Then, the detection method of using burnt rock as medium and its limitations are summarized. Finally, the thermal energy recovery of the rock formation and the resource utilization are discussed. The results show that the mineral composition of the new burnt rock in the active fire area changes significantly with temperature, and the color is mainly controlled by iron and manganese oxide with temperature rising. According to the mineral and thermal characteristics, the burnt rock can be used as a basis for detecting coal fire, but the methods are currently defective. The thermal characteristics also show that the burnt rock has a large amount of heat energy, which can be recycled, and also has the use value after cooling.