The Bukachacha field, located in Eastern Transbaikalia (coordinates 53° N and 116°50' E), attracts attention for three reasons. Firstly, among other Mesozoic spots basins in Transbaikalia, it has undergone has been subjected to the most detailed geological investigations research , and therefore the results of work on it there make it possible to outline a methodology for studying similar uch deposits, which has not yet been sufficiently developed; secondly, because its study sheds light on the genesis of Upper Jurassic deposits and tectonics; and, thirdly, because the deposit has sintering coals, which sharply distinguishes it from other brown coal deposits in Transbaikalia. The coal-bearing deposits of the deposit field cover occupy an area of about 40 km², their bounded aries are by the Sarananda and Kudikhta rivers. The cCoal-bearing deposits are surrounded by hills of crystalline rocks, and the boundary of their distribution coincides with the boundaries of the valley. These contours, iIn addition to their natural contours, determined by outlines, due to the differing ent hardness of the crystalline rocks and the coal-bearing deposits, were these boundaries hae been established by exploration workings, the lines of which intersect the deposit at a close distance intervals from each other, and these lines in places extend onto the granites. There are no natural outcrops of coal-bearing sequence trata in the area, and all data on its occurrence and composition were have been obtained on the basis of from mine workings.