Kin ah an — The Economic Geology of Ireland. 347 



through the late Mr. Henry Robinson, Captains Barclay, and 

 Argall, sen., also from various miners, that the vein rarely ex- 

 ceeded that thickness, while often it was less. Eventually it 

 dwindled down to a mere string, which was driven and sank on, 

 without rinding any improvement. No one in the county seems 

 ever to have heard of an eighteen inch vein (Geol. Survey Memoir, 

 Sheets 138 and 139, p. 31), while it seems remarkable, if stick a 

 champion lode was discovered, that immediately afterwards the mine 

 should have been abandoned. 



In Appendix D [ibid., pp. 41 and 42) three of the Plans, &c., 

 Nos. 5, 6, and 7, lodged in the Mining Record Office, are omitted ; 

 while the numbers given, 5 to 20, are not those on the lodged 

 documents. For the survey of the old workings the public are 

 indebted to Captain P. H. Argall, and not to Captain Higgins, as 

 is incorrectly stated (ibid., footnote, p. 29). For other inaccuracies, 

 see descriptions of the Ovoca Mines, these Proceedings, vol. v., 

 pp. 305-315, and Capt. Argall's Paper on the East Ovoca Mines 

 (these Proceedings, vol. ii., p. 211). 



Ovoca Mines. — The following details, not previously given, 

 may be of importance to future adventurers : — 



Although Weaver seems to have had some doubts about it, yet 

 previous to my survey the general opinion was, that the Mineral 

 Channel had a similar strike and dip to those of the couutry rocks. 

 During that examination, assisted by Captain P. H. Argall and 

 the late Grerrard A. Kinahan, I proved it was not so, as the channel 

 generally creeps across the strata, and a careful and prolonged 

 examination led to the following conclusions : — 



A large fissure gradually opened, during which process it was 

 being filled with laminated faultroch, the strike of the lamince being 

 parallel to the walls of the fissure, while now they dip southward. 

 Subsequently, in the western portion of this channel (Ballymur- 

 tagh, Ballygahan, Tigroney, and West Cronebane) , a newer fissure 

 also gradually opened along the north margin of the mass of fault- 

 rock, this fissure gradually filling with laminated sulphur ore ; its 

 larninoe being parallel to the foot (north) wall of the lode, while it 

 is slightly oblique in dip to that of the hanging (south) wall. A 

 peculiarity in this main sulphur lode is, that in depth the ore is 

 more coppery than higher up. Afterward in this portion of the 

 channel, to the south of the main sulphur lode, perpendicular len- 



