Hardman — On Analysis of Coals and Iron-stones. 529 



XLY . — Analysis of Coals and Ikon-stones feo:m the Ditngannon 

 CoAx-FiELD, Co. Tyrone. By Edwaud T. Hakdman, P. C. S., 

 &c., of the Geological Survey of Ireland. 



[Kead Febraary 28th, 1876.] 



Analyses of one or two of the coals of Dungannon have been 

 already published by Sir Eichard Griffith,*" and Sir Robert Kane.f 



During a stay of over a year in the neighbourhood, while making 

 a survey of the coal-field, I had opportunities of obtaining good 

 average samples of all the more important coals at present being 

 "worked, and having examined them, I now propose to place the re- 

 sults before the Academy. 



I have already, elsewhere, published more or less detailed descriptions 

 of this coal-field,]: and shall enter no further at present into what would 

 only be repetition than to say that the coal measures there, although 

 occupying but a small area, are about 2,000 ft. thick, and contain from 

 22 to 24 coal seams; all of them of fair, and some of excellent quality. 

 These vary in thickness from 10 in. to 9 ft. 



Appended is a list of the more important of these coals in order : 



Table of the Coals at Present being "Worked. 



Dungannon Coal-Field. 



ft. in. 



'"Annagher Coal,| 9 



Middle Bone Coal, 2 10 



Coal Shining Seam, 3 



Measures. ' Brackaville Coal, 5 



j GortnaskeaCoal(with 22in. cannel),! 6 



{Coal Island Beltiboy Coal,| 3 



series). Derry Coal,| 3 6 to 5 ft. 



L Yard Coal, 3 



uncertahi. j CreenaghCoal | (with Uin.cannel),]: 4 6 



Lower Coal A 



Measures. / Main Coal of Drumglass,:}: . . . 4 10 to 6 ft. 

 {Drumglass I Lower ,, ,, ... I 6 to 2 ft. 



series). J 



Those marked with an asterisk are included in the following ana- 

 lyses, being the only seams which were worked upon when I was in 

 the district. 



* Geological and Mining Surveys of Tyrone, &c. (Dublin, 1839), p. 12. Tbese 

 analyses are unfortunately nearly useless by reason of misprints. 



t Industrial Resources of Ireland. 



X See " On the Present State of Coal Mining in the Co. Tyrone." By Edward 

 T. Hardman, in Jour. Eoy. Dub. Soc, Vol. vi., part 42, p. 366. Also " Geolo- 

 gical Structure of the Tyi-one Coal-fields." Eeport Brit. Assoc, 1874, Belfast. 



