1. Coal seams intermixed with iron ore.

2. The average UK coal seam is one metre thick.

3. He proposes that the coal seams should be worked in the advance.

4. The buried trees became coal seams and the mud and sands turned to shale and sandstone.

5. Table 3. 2 provides individual estimate for gaseous coal seams with the geometric mean used wherever a wide spread is given.

6. In areas of shallow coal seams and dried out peat deposits, fires can smoulder below ground level for years.

7. Beneath them the coal seams are buried and preserved for our miners today.

8. The sedimentary rocks, with their coal seams, have been folded and faulted.

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9. Coal Mine, its coal seam is easily spontaneous fire.

10. The spontaneous combustion of coal seam of the major problems in safe production of coal mine.

11. The paper introduces some mining measures in soft coal seam of Linnanchang Mine and soft floor by leaving top coal. The measurements ensure safety mining.

12. Grave protrusion coal seam tunnelling hydraulic cutting protrusion - dispelling measures is a new technology in the world.

13. Li Mingchao Coal seam gas and its reconnoiter and exploitation. Beijing: Geology Publishing House, 1996.

14. The migrating methane by cross - borehole in coal seam is used in this condition.

15. The 10th coal seam floor's water invasion coefficient for region of interest is calculated by use of the modificatory water invasion coefficient computing formula.

16. The geological controls on content and producibility of coal seam gas are studied.

17. Exploration evaluation coal seam gas is a base of coal seam gas exploration and developing.

18. The spontaneous combustion of coal seam endangers the safe production.

19. To solve strata pressure control of shallow coal seam with thick sand and thin bedrock, in-situ observation was carried out in Baoshan mine 6101 fully mechanized coalface, which is the first coalface.

20. They plan to pump a suspension of catalysts in steam and air or hydrogen, down into a coal seam.

21. Claystones and siltstones containing finely dispersed coaly matter are considered to be good sources - besides many coal seams.

22. Within the north structure block, with the influence of the thin seam thickness, the thickness of the structure coal seam was relevantly thin.

23. From Hales method, reversed refracted wave method shows accuracy and efficiency in detecting the thickness of remained coal seam.

24. The authors used the Analytic Hierarchy Process ( AHP ) in the researches of coal seam floor water - irruption.

25. Discussion feasibility on using light hydraulic support from the practice of coal seam in Duerping mine.

26. On a global scale, there are many coalfields suffered from spontaneous combustion of coal seam problems.

27. The paper held that the two leg shield caving powered support would not be suitable for the top coal caving mining in the hard coal seam and the joint crack undeveloped medium hard seam.

28. The relationships between the permeability of the methane gas in coal seam and surface fractal dimension and tortuosity fractal dimension are proposed based on fractal theory and Darcy Law.

29. The determination of damage height of superincumbent stratum of goaf has immense meaning for safety and reasonable exploitation of coal seam under water body, building and railway.

30. The research results provided stable theoretical basis for high gas coal seam fully-mechanized face gas dynamic disaster control.

1. The average UK coal seam is one metre thick.

31. There are many kinds of forms of gas discharge, but the main form is soft coal seam gas discharge.

32. The coal transmutative degree and variational rule of coal seam physical character are different in the prospection for CBM. The situation restricted CBM industrialization in China.

33. The occurrence of rock burst not only need a great deal of elastic energy gathering in the coal seam and the around rock stratum, but also the external energy released by the main key stratum break.

34. The research indicates that volume modulus, cohesion and internal friction angle of coal seam around the roadway have a great influence on stress distribution.

35. Using joint inversion of logging and seismic data, the transverse change of coal measure was studied and the lithologies of coal seam roof and bottom was predicted.

36. This paper goes further into blast - winning technology of the composite coal seam face.

37. The storage, application and forecast of coal seam gas in Hegang mine field are introduced, and the detailed mining area and way for earlier and later stage are provided.

38. The distribution patterns of underground coal seam is diversified. The plane distribution is only one of the simple curved surface distribution patterns.

39. The II3123 face is a light type caving face of three-soft coal seam. the roof is cracked, sloughing and roof fall often occur.

40. Optimizing the Construction Organization Planning, Decreasing the Tunes of Uncovering Coal Seam, Shortening the Period of Mine Construction.

41. Coal Mine and the coal seam 13 - 1 has especially complex hydrogeology condition.

42. The Gaussian curvature of No.3 coal seam in Qinshui basin is calculated.

43. The surrounding rock of roadways in soft coal seam has low strength and bad stability.

44. The mechanism and control of coal seam with soft coal,[] roof and floor roadway floor heave is a difficult problem in mining subject.

45. Factors affected coal seam permeability change and its law is analyzed.

46. This paper is a guide to precise determination of the content of coal seam methane.

47. Based on consideration of stress sensitivity of coal seam permeability, the single-phase flow rule of coal-bed gas in coal and cleats is studied by using non-equilibrium adsorption model.

48. Drilling borehole in hard coal seam is mostly used to discharge gas, and cross layer borehole, roof rock borehole and laneway are mainly used to discharge gas in soft coal seam.

49. Gas concentrations drop, and the effective gas drainage period of holes is shortened, because pores and cracks in the coal seam become completely developed after gas drainage.

50. Based on the difference between hard coal and deformed soft coal on physical characteristics, analyzing the response that deformed soft coal seam is on well log.

51. Geological condition in Zhaogezhuang coalmine, Kailuan is very complex. Numerous minor scaled structures and coal seam occurrence are main limitation factors to mine development all along.

52. Coal body is watered by deep hole high pressure above mid-hard coal seam to soften the harder coal so as to improve the working efficience. It's a new way for mechanization mining in harder seam.

53. This study provides a scientific method about studying the gas content of the coal seam unmined and provides the basic data about the safe mining.

54. There are of forms of gas discharge , but the form is soft coal seam gas discharge.

55. Making use of horizontal pinnate branch well to develop and utilize coal seam gas, is a new drilling technique, which is different from horizontal drilling and has its own uniqueness.

56. The crack in the coal seam is divided into two kinds: endogenic crack and exogenous crack.

57. Essential way of solving the gas drainage problem of low permeability coal seam is seam permeability.

58. It was discovered that the gallium is more than marginal grade in content and enriched in lower coal seam and floor, and occurs mainly in diaspore.

59. Based on 172 borehole data of northern Shenmu coal mine, the paper is directed at to anglicizing the floor elevation trend of 5-2 coal seam by using the trend analysis method.