A. R. Andrew—The Dolgelley Gold-beit. 263 
lodes dips usually to the south, but in places towards the north the 
lode is seldom less than 3 feet in width, often much more. Leaders 
and stringers are frequent, but otherwise the walls are well defined. 
The blende in this lode is abundant; galena and chalcopyrite also 
occur. The Moel-Ispri Mine (the Voel C lode) mined 66 tons of 
quartz for 88 ounces of gold, while the Prince of Wales Mine (the 
Yoel A lode) has mined 20 tons of quartz for 63 ounces of gold, The 
outcrop of the Voel C lode may be traced for about 1 mile; at its 
western end it strikes 70° east of north; towards the east it strikes 
more and more northerly, finally becoming 40° east of north. 
The two most southerly lodes of the Voel group occur in the Pen 
Rhos Beds; the most northerly runs along in the Vigra Beds for most 
of its observed length, but finally at its eastern extremity enters the 
Pen Rhos Beds. Greenstones occur frequently along the course of the 
veins, and the latter are most clearly defined in the neighbourhood 
of an igneous intrusion. 
Cesailgwm or Wnion Lode.—This lode is well exposed on the slopes 
of the hill east of Cesailgwm-mawr, about 14 miles up the stream 
which enters the Mawddach estuary near Borthwnog. Thence it 
may be traced at intervals for a distance of two-thirds of a mile to the 
west, and for a distance of about 2 miles to the east. Its general 
strike is 60° east of north, its dip never varies very much from the 
vertical. Its walls are well defined and consist of the Clogau and 
the Vigra Beds, near whose contact the lode always lies. Intrusive 
rocks occur at intervals along the course of the lode. The lode is 
usually 2 to 4 feet wide, often dwindling down, however, to mere 
veinlets. The vein is not heavily mineralized, but blende, galena, 
and chalcopyrite are found. In the years 1893-4 this lode produced 
36 ounces of gold from 61 tons of stone. 
In the Cesailgwm Valley, there is a lode parallel to and north of the 
Cesailgwm lode, which has been worked by the Borth Valley Gold 
Mining Company. Where opened up the lode formation is about 
4 feet wide; it has a banded structure, being made up of 2 feet of 
poorly mineralized quartz, and a varying thickness, up to 2 feet, of 
mingled quartz and crushed country rock. Few mineral sulphides 
are to be seen; gold can be got by crushing and panning. This lode 
yielded 27 ounces of gold in 1906. 
Blaen-y-cwm Group.—To the north of Blaen-y-cwm, near the head- 
waters of the Afon Wnion, there are numerous outcrops of small 
lodes, none of which extend far in strike. There are five lodes of this 
nature, all occurring in the Clogau Beds, though some extend from 
there into the Vigra Beds. ‘Two of these lodes strike 60° east of north ; 
two strike 15° south of east; one strikes 15° east of north. 
All the veins of this group are similar to each other in formation 
and contents. Their width ranges from 3 feet downwards. The 
walls of the vein are poorly defined and usually there is no selvage of 
clay. The intrusive greenstones are seldom seen in association with 
this group. The lode matter contains a large admixture of shaly 
material derived from the walls; the quartz contains galena, blende, 
arsenopyrite and pyrites. 
Cefn Coch Lode. —Next to the St. David’s—Clogau and the 
