Abstract: Coal spontaneous combustion is not only affects the surrounding ecological environment of mining area,but also leads to a huge consumption of resources.Taking the burning area of Inan Coal Field in Yili Basin as the study example,based on the magnetic differentiation of the thermoremanent magnetization produced by the surrounding rock of the bottom and roof of underground coal seam after spontaneous combustion,the highprecision magnetic measurement method is adopted,the analysis and interpretation of highprecision magnetic anomalies of the measurement area are conducted,through magnetic profile inversion,actual geological survey and engineering drilling verification,the spontaneous combustion boundary of the burning area is delineated finally.The above study results of this paper about the delineation of spontaneous combustion boundary of the burning area of Ian Coal Field in Yili Basin can provide some reliable reference for the safety and orderly mining of the coal field.

Key words: Highprecision magnetic measurement, Coal field, Boundary of burning area