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(31) From microscopic examination of rocks and minerals, the author analyzed morphological characteristics and occurrence status of siderite in Tongziyan Formation, Longyong Coalfield.

(32) The Fault - fracture network is the main space of accumulating karst - fissure water limestone of Weibei coalfield.

(33) The Permian coalbed methane(CBM) reservoir with mixed secondary biogenic and thermogenic gas in the Huainan Coalfield, Anhui Province, is affected by complex geological and hydrogeological factors.

(34) Static computation is a key step to deal with coalfield seismic data of complex surface conditions.

(35) Huainan coalfield is rich in coalbed methane resources and has large - scale coalmine methane drainage.

(36) Resinite is a rich n 1 aceral in Teriary humic coal, boghead - cannel coal and oil shale fromHuangxian Coalfield.

(37) The paper discusses in detail basic characteristics of channel wave and their main causes in the Datong Jurassic coalfield.

(38) Based on this theory, the boundary of coal layer spontaneous combustion area in a coalfield in northwest China is determined by high-precision magnetic measurement.

(39) Coalfield burning does great harm to coal exploring, pit building and mine opening up.

(40) The Application And Experimentation Prospect for DaTong coalfield to resource of Permo-carboniferous period By Air drilling, Foam drilling, DTH hammer drilling with experience of drilling techniques.

(41) Coal spontaneous combustion is one of disaster in Yima coalfield.

(42) The coal cleat pattern in the Kushiro coalfield, Japan[Sentencedict], shows some analogy to isolated straight joints.

(43) There used to be igneous intrusions into coal measures and overlying strata in the Hanxing coalfield.

(44) Survey of XiShan coalfield geology, analyze coalform, improve of geology exploration means.