Mi*. Weaver on Irish Tin Ot'e. 29 



the gold was constantly accompanied by magnetic ironstone 

 (sometimes in masses of half a hundred weight), by magnetic 

 ironsand, by cubical and dodecahedral iron pyrites; and in 

 small pieces and grains, by specular iron ore, brown and red 

 ironstone, iron ochre, fragments of tinstone crystals, wolfram, 

 gray ore of manganese, pieces of quartz and chlorite, and 

 sometimes fragments of quartz crystals. I observed and col- 

 lected also some specimens, which show that the gold, mag- 

 netic ironstone, and wolfram, were each of them frequently in- 

 termingled with quartz; and I have also a few specimens 

 which exhibit the gold not only incorporated with iron ochre, 

 but ramifying in slight threads through wolfram. 



To satisfy and amuse some of my county of Wicklow friends 

 at the time, I made an assay of the fragmentary crystals of 

 tinstone, showing to them as good metallic tin as was ever pro- 

 duced in Cornwall. 



The operations were interrupted by the Irish Rebellion of 

 1798 ; but were resumed in 1801, founded on our report made 

 to Government that year. Subsequent researches showed that 

 the gold and the tin ore were not confined to Croghan Kin- 

 shela, both being found also in a mountain named Croghan 

 Moira, about seven miles distant from the former mountain. 

 Of the three stream- works established there, one was placed on 

 Ballycreen, in the stream at the eastern foot of the mountain, 

 and minute particles of gold were found accompanied by 

 magnetic ironstone, magnetic ironsand, compact brown iron- 

 stone, cubical iron pyrites, and numerous small garnets. In 

 a second, placed in Ballinacapogue brook, on the western 

 side of the mountain, small particles of gold were obtained 

 with magnetic ironstone, magnetic ironsand, and fragments 

 of tinstone crystals. A third trial, in Faunanerin stream, on 

 the north-eastern flank of the mountain, did not produce any 

 gold. 



The existence of tin ore in the county of Wicklow having 

 been thus well established, the Dublin Society, at the sugges- 

 tion of their Committee of Mineralogy, offered, among its other 

 annual premiums, in the early part of this century, a premium 

 oijifty pounds to the discoverer of a mine of tin ore in Ireland ; 

 and a reference to the printed proceedings of that Society 

 will, I think, show that my memory is correct in stating that 

 that premium was offered for several successive years. 



In 1818 I drew up my memoir on the Geological Rela- 

 tions of the East of Ireland, which was published in 1819, 

 in the first part of the fifth volume of the Geological Trans- 

 actions of London. In that memoir I have given a succinct 

 and faithful account of the whole of the proceedings under 

 Government in respect of the gold workings conducted in the 



