262 A. R. Andrew—The Dolgelley Grold-belt. 
and running with the beds, it is associated throughout its length with 
greenstone sills. 
Bryntirion Lode.—Kast of the Bryn-y-groes lode is another parallel 
lode, with, however, a strong dip to the south-east. Like the Bryn-y- 
groes lode it is poorly mineralized, and has been worked but little. 
It is confined throughout its length of three-quarters of a mile to the 
Vigra Beds, and it is but seldom associated with the intrusive 
ereenstones. 
Garth-gell Lode.—At its northern end this lode crosses the junction 
of the Afon Cwm-Mynach and the Nant-Cesailgwm, and from there it 
has been traced 200 yards to the south. Its strike is 25° east of 
north, and its dip vertical. It traverses the Vigra Beds all the way, 
and is associated with small greenstone sills and dykes. Throughout 
its length its width is very variable. In many places it has clay 
selvages along its walls, but these are not constant. The quartz 
of the vein is hard, white, and often drusy; pyrites and chalcopyrite 
are the most frequent minerals, and with them also are found blende, 
some galena, muscovite, and chlorite. In 1900, 26 tons of quartz were 
milled for 5 ounces of gold. 
Maes-tryfer Lode.—This is an unimportant vein which crosses the 
line of the Garthgell lode close to the junction of the Cwm-Mynach 
and Cesailgwm streams. Different from all the lodes already described, 
its strike is no longer north-easterly, but 30° south of east. It courses 
through the Vigra Beds, and is confined to very near their junction 
with the Clogau Slates. Little work has been done on the lode, and 
its characters are not known. 
Cambrian Lode.—800 yards above the point where the Afon Cwm- 
Mynach enters the estuary, the outcrop of a quartz lode is seen in 
the stream. It courses in a north-east and south-west direction 
(65° east of north) and can be continuously traced for about half a mile. 
It is vertical throughout its length; its walls are well defined, and in 
places have selvages of clay, 2 or 3 inches thick. The vein is poorly 
mineralized, the chief minerals which do occur being galena, chalcopyrite, 
and blende, for the first of which the lode was once worked. ‘The lode 
crosses the Vigra Beds of the Maentwrog Series. 
The Voel Group of Lodes.—About the year 1860 there were several 
companies mining different portions of the lodes of this group, each 
mine being known by a distinctive name, Princess Alice, Prince of 
Wales, Glan-y-morfa, and Moel-Ispri. Later (1900-4), these lodes 
were worked by the Voel Company. There are three separate 
parallel lodes on the property with numerous small stringers. The 
strike of the lodes is north-easterly, changing from 70° east of north 
on top of Foel Ispri, to 50° east of north near the turnpike road. The 
most southerly of the parallel veins (that nearest to the estuary) has 
been opened up in several places, and has a shaft extending below sea- 
level. The lode is from 1 to 3 feet wide, with clearly defined walls. 
The quartz contains a large amount of blende, along with some 
chalcopyrite, pyrites, and pyrrhotite. 
The intermediate lode of the three cannot be clearly seen; it is 
opened up by a few cross-cuts into the side of the hill, but these are 
no longer accessible. The uppermost and most northerly of the Voel 
