266 A. R. Andrew—The Dolgelley Gold-beilt. 
chalcopyrite and pyrite being also present. Gold was obtained from 
this lode during the period 1896-1902, 109 tons of quartz being 
crushed for 1053 ounces of gold. 
Ceunant-hyli Lodes.—The Ffridd-goch lode is crossed by the line of 
the Ceunant-hyll lodes, a set of two or three minor veins on which 
a small amount of development work has been done. Like the Ffridd- 
goch lodes these occur in the lower part of the Ffestiniog Flags, 
and are associated with large intrusions of a coarse-grained greenstone, 
which is in places amygdaloidal. The largest lode strikes 5° south of 
east, and can be seen for about 500 yards along the strike; its width 
is from 18 to 24 inches. There is also another lode, striking 65° south 
of east, and dipping much more steeply. The vein matter of these 
lodes is similar, and consists of crumbly pyritous quartz, containing 
a large amount of tale and chlorite, and a little chalcopyrite; gold 
also has been found here. 
Dol-y-frwynog Lodes.—On the western bank of the Afon-wen, 
directly opposite the Ceunant-hyll lodes, is the southern extremity of 
the Dol-y-frwynog lodes. The main lode of these strikes 25° east of 
north, and has a course of at least 900 yards; it is accompanied by 
several parallel veins of variable extension in strike, the dip of all 
being approximately vertical. At the largest cross-cut there are five 
parallel lodes, ranging from 1 to 6 feet in thickness. To the north 
another lode has been worked to a great extent ; the strike is 35° east 
of north, and gold was here associated with chalcopyrite and pyrites. 
The rocks traversed by these lodes are the Pen Rhos Beds of the 
Maentwrog. Greenstones occur along the course of the lodes, and 
have their ferro-magnesian constituent largely converted to tale and 
chlorite. 
Cefn-deuddwr Lodes.—At the junction of the Afon Eden with the 
Mawddach, there are two parallel lodes striking 15° south of east, 
and dipping towards the north at an angle varying from 55° to 80°. 
They can be traced for only a short distance, along which they lie 
in the Vigra Beds of the Maentwrog, and cross in their course several 
greenstone sills. Chalcopyrite occurs in the quartz, galena and gold 
also occur in small quantities. 
Tyddyn-Gwladys Lode.—About a mile above the Mawddach-Eden 
confluence, on the road to the Gwyn-fynydd Mine, several old levels 
and cross-cuts open up the T'yddyn-Gwladys lode; this strikes about 
55° east of north, and dips from 60° to 80° towards the north-west. 
The outcrop of the lode lies in the Clogau or Menevian black slates, 
and passes through many sills of intrusive greenstone. In the places 
where the lode is now exposed, the quartz is white and poorly 
mineralized; the dominant metallic mineral is galena, for which, and 
the silver contained therein, the lode was mined. Other minerals 
seen in the lode-matter are blende, chalcopyrite, arsenopyrite, and 
pyrites. Gold has also been obtained from this lode, 7 ounces having 
been got in 1889. 
Cwm-heisian Lode.—On the opposite bank of the Mawddach from the 
Tyddyn-Gwladys Mine, is the Cwm-heisian or Cwm-eisen lode, which 
strikes 10° south of east, and dips towards the north, from 70° up to 
practically a vertical position. The lode outcrop is much obscured 
