88 } REPORT—1862. 
the ton. Selected specimens have given as much as 300 ounces. Visible gold is 
occasionally found in the galena, and he had seen it also in copper-pyrites. 
Assays for gold gave from 6 to 11 dwts. per ton. Some moss pulled from the 
river-side had small specks of gold attached to the roots. 
Penmaen Copper Mine has some very strong metalliferous veins upon it, said to 
be auriferous. Visible gold is said to have been found here. 
Dolfrwynog Gold Mine is situate about a mile over the mountain eastward from 
Cwnheisian, and includes the farms denoted on the Ordnance Map—Dolfrwynog, 
Tynsimna, Bwlchroswen, and Rhoswen. This is a very remarkable property. 
There are several strong lodes, only one of which he notices in the paper: it is 
known as the “ Gold Lode.” He had stones of beautiful quartz from this lode, 
containing at least 400 ounces of gold to the ton!; and he believes that a goodly 
amount of gold will be obtained from this lode, although it underlies north 6 feet 
in a fathom, and at the depth of about 60 fathoms enters a spur of the North Dol- 
frwynog Mine. He had specimens from this lode in the International Exhibition, 
and had seen stones taken from a depth of nearly 40 fathoms, richer than any 
at Clogau. The bulk of this lode-stuff will give on an average, he thought, from 
10 to 15 dwts. of gold to the ton. 
East Dolfrwynog Mine is on the east of the last-mentioned, and takes in the 
farms marked on the Ordnance Map—Buarthrae, Doledd, and Penbryn. There are 
a or more lodes on this property, which give on assay from 6 to 9 dwts. of gold to 
the ton. 
The Dolfrwynog Gold Lode runs into Penbryn—a few yards from the spot, at 
Dolfrwynog, where the richest gold was discovered. It is about 5 feet wide, and 
of precisely the same character, and will probably prove as rich. 
North Dolfrwynog Gold and Copper Mine is situate on the east bank of the 
Mawddach. There are ten metalliferous veins in this property, and all of them 
auriferous. The Dolfrwynog rich Gold Lode underlies into this sett; and it is 
certain that at the depth of 60 fathoms very rich gold will be found. 
Assays of the lode-stuff from this mine give an average of 9 dwts. of gold to the 
ton. 
The author said that he had once extracted as much as 6 ounces to the ton from 
stuff in which gold was not detectable under a powerful microscope. He had recently 
superintended the removal of about 100 tons of alluvium from the eastern bank of 
the Mawddach, with the object of discovering whether the particles of gold found 
therein increased in size from the surface to the bed-rock. He found this to be 
the case; and the sample of coarse-grain gold produced was perhaps the most in- 
teresting item of the recent discoveries. This gold was obtained by a very rough 
washing over a trough 30 feet long,—a process which washed away all the fine gold, 
weighing probably ten times as much as the coarse gold obtained. It is probable 
that the whole side of this mountain will be found to contain gold in paying quan- 
tities on the erection of machinery to economize labour. 
West Dolfrwynog Copper and Gold Mine adjoins the last-mentioned on the south, 
and is marked on the Ordnance Map the “Turf Copper Mine,” from the singular 
fact that, some time ago, about £10,000 of copper was sold from the ashes of peat, 
there burnt for the purpose. The water at the present time is highly saturated 
with copper; and a shaft, now in course of sinking, will probably discover a large 
deposit of copper-ore, if not gold. 
The lode-stuff of this mine gives on assay about the same quantity of gold as 
North Dolfrwynog. On a portion of the mine the author found the alluvium to 
contain gold under the same circumstances and in about the same proportions as 
the North Dolfrwynog Mine. Gold has been obtained here at the rate of 6 ounces 
to the ton. The minerals of this mine and Dolfrwynog are identical in character. 
Tue Marsawm SEcTIon 
Is on the western side of the Trawsfynydd Road, nearly opposite Tyddynglwadis. 
. Maesgwm Mining Sett extends over 1600 acres, and has three large lodes on it, 
which are all auriferous. 
The Cwmheisian Great Gold Lode runs into it, and the Ganllwyd Gold Lode. 
