NOTES AND QUERIES. 
159 
from Beauvais, in France, analysed by Berthier, is also of a honey yellow colour, 
and found in chalk. It occurs lining small cavities, and in veins, sometimes in 
little reniform masses, and with a resinous or waxy lustre ; the analysis is as 
follows : 
S Al H Fe Ca C 
Woolwich.— 20.50 31.34 42.91 0.31 1.92 2.73=99.71.— A B. Northcote. 
France.— 21.90 29.20 44.20 Clay 4.7 = 100.— Berthier. 
J. R. G. 
To the Eililor of t/ie Ueoloqist. 
Sir, — I beg to inform your correspondent, G. S., that it is in the Dolgelly 
district of North Wales where auriferous minerals have been chiefly discovered, 
and where the geological conditions are said to be analogous to those of some other 
gold-producing countries. Gold has been found in the mines known as Vigra, 
Clogau, Caegwain, Wellington, Victoria, Lachfraith, Cambrian, Prince of Wales, 
West Prince of Wales, Glasdir, Tyddyngwladis, Dolfrwynog, North Dolfrwynog, 
West Dolfrwynog, Cwmheisian, Berthllwyd, and Caegwernog. I have myself found 
gold in quartz, carbonate of lime, slate, chlorite schist, blende, galena, copper 
pyrites, iron pyrites, tetradymite, and bismuthine ; and of its occasional occurrence 
in exti'aordinary richness in the Clogau, Cambrian, and Dolfrwynog mines I 
possess remarkable proofs. To my own knowledge, so recently as 1856, as much 
as 14.1 ounces of gold were obtained from lOOlbs weight of quartz, taken from the 
Cloga\i mine, and many samples of 141bs. weight from the Clogau and Cambrian 
mines have yielded in the proportion of 1 to 10 ounces of gold to the ton of 
quartz. Hitherto the attempts to extract the gold on a commercial scale have not 
proved successful. This does not obliterate the mineralogical facts. Whether 
gold exists in remunerative quantities in the rocks of this district, although it 
may not be actually visible, remains still undetermined. Perhaps it does not ; but 
this point, however, is not proven. 
Yours, &c., 
T. A READWIN. 
4 St. George's Square, Pimlico, 20th March. 
Gold in Wales. — G. S. (page 116.) — The gold in North Wales is found chiefly 
in Merionethshire, at several places near Dolgelly, principally at Cwm-y-swm, 
Clogau, and Dolfrwynog ; it occurs in a granular and cellular quartz, with much 
mica in fine scales, and stained brown by peroxide of iron, at Cwm-y-swm and 
Clogau, with galena, blende, and copper-pyrites, very finely disseminated. The 
whole district consists of a quartz and mica-slute rock, with sometimes thin layers 
of clay-slate, and the quartz in veins, from a quarter of an inch to several feet in 
thickness, and generally much decomposed and ferruginous, and no doubt often 
auriferous. I received three or four ounces from Dolfrwynog a few years ago, as a 
specimen, it was washed from the pulverized rock ; it is always of a pale yellow 
colour, and the particles are more or less mixed with quartz. The specimens I 
had were worth about £3 8s. per ounce. — J. R. G. 
We were aware of the paper read on November 19th, 1856, by Professor J. 
Morris, before the Geological Society of London, and published in the Thirteenth 
Volume (1857) of the Quarterly Journal of that Society, as well as of Mr. 
Northcote's article on the composition of AUophane, in the Thirteenth Volume of 
the Philosophical Magazine. We were also aware of several papers on the second 
point — that of gold in Wales. But we left both questions open, in the expectation 
that some of those scientific geologists whom we know possess information 
respectively on these subjects would kindly add something new to the general 
stock of knowledge. 
We would further take this opportunity, while thanking Professor Ansted, Mr. 
Readwin, and J. R. G. for their notices, to add, that, although in most cases, 
unless for some such .special reason as that we have mentioned, we answer the 
queries in the same number in which we print them, we do so only to give early 
