Geological Relations of the Hast of Ireland. 209 
in the mountains adjacent to the districts that abound in massy 
alluvial gold."' 
2. The peculiar circumstances under which the native gold of 
Croghan Kinshela was found. It occurred in massy lumps, and in 
smaller pieces, down to the minutest grain. One piece weighed 
twenty-two ounces, another eighteen ounces, a third nine ounces, 
and a fourth seven ounces. The gold was found, accompanied by 
other metallic substances, dispersed through a kind of stratum com- 
posed of clay, sand, gravel, and fragments of rock, and covered by 
soil, which sometimes attained to a very considerable depth, from 
twenty to fifty feet, in the bed and banks of the different streams. 
By the operations in the stream works, (which are too well known 
to professed miners, to need detail on the present occasion) all the 
metallic particles thus disseminated were collected in a concentrated 
mass ; and in those at Ballinvalley it was constantly found that the 
gold was attended by magnetic iron stone, sometimes in masses of 
half a hundred weight, by magnetic iron sand, by cubical and dode- 
cahedral iron pyrites ; and in small pieces and grains, by specular 
iron ore, brown and red ironstone, iron ochre, fragments of tinstone 
crystals, wolfram, grey ore of manganese, pieces of quartz and 
chlorite, and sometimes fragments of quartz crystals. I observed 
and collected also some specimens, which shew that the gold, mag- 
netic ironstone, and wolfram, were each of them frequently inter- 
mingled with quartz ; and I have also a few specimens, which 
exhibit the gold not only incorporated with iron ochre, but rami- 
fying in slight threads through wolfram. Some of the gold, though 
* See > for example, the Travels of Ulloa and of Humboldt in America; Molina’s Chili ; 
Park’s Travels in Africa; Marsden’s Sumatra; Turner’s Thibet; Abhandlungen iiber 
Bergbaukunde; Dr. Clarke’s Travels in Europe, Asia, and Africa, vol. iv. ; Robilant on 
Piedmont, in Journal des Mines, vol.ix.; and D’Aubuisson in vol. xxix. 
Vol. V. 2d 
