Llyn Eiddew Mawr

Alternative nameLlyn Eiddaw
Llyn Eiddew
Llynau Eiddew [GAS DAO Z/DAM/630]
Llyn Ciddew Mawr [Halse 1887: 111] (typographical error?)
Craig Ddrwg(?)
LocationSH645340 (Area map showing location.)
GeologyThe manganese bed outcrop runs south-west from the northern extremity of Llyn Eiddew Mawr for about 600 m. The bed is about .3 m thick and dips northward. [Dewey & Bromehead 1915: 53]
1889–1891  Welsh Manganese Co. Ltd
1918Cambrian Manganese Co. agent C Roberts
1920–1922Cambrian Manganese Co. agent T O Williams
Production and Employment

underground surface
1918  14
1920  13
1921  10
* appears in the Home Office list of mines as Llyn Du Bach [Dewey & Bromehead 1915: 53]
TransportInternal tramways. Output by road to Talsarnau.
RemainsMainly opencast workings close to north end of lake. Surface and underground pack walls well preserved. Where tramway formations from faces emerge from cuttings though backfill there are stone floors, one about 6 m x 1.5 m. There is a pair of substantial bridge abutments where a tramway to a tip crossed above the mine exit track. (June 2002)
AccessThe north-west end of the mine is crossed by a public right of way to the lake.

graphic: plan Ore was described as existing here in 1887 [Halse 1887: 111].

In 1915 the mine was described as “abandoned” with ore recently extracted and waiting to be removed. [Dewey & Bromehead 1915: 53], however, in 1923 it was stated to have been worked during WW1 and was currently “active” [Dewey & Dines 1923: 64]

The name Craig Ddrwg is mentioned in Llais Ardudwy [September 1988] in a reference (undated) to a choir from Gwaith Mango Graig Ddrwg uwchlaw Talsarnau, Merion (Craig Ddrwg manganese work [i.e. mine] above Talsarnau, Merioneth) – Craig Ddrwg is the name of the ridge to the east of and overlooking Llyn Eiddew Mawr.

photo: workings   Workings

A general view of some of the opencast workings showing the situation of the mine by Llyn Eiddew Mawr.

photo: workings   Workings

Opencast workings with grassed-over tips and cuttings leading away from the working face.

photo: workings   Opencast and underground working

Here the opencast working has been extended into a small underground chamber.

The worked face is on the left and waste has been walled up on the right of the working.

photo: workings   Underground Working

Looking out of the entrance visible in the previous picture.

Note the massive pack wall. This walling continues around the camera position to close the chamber behind the viewpoint.

photo: workings   Workings

Opencast working along a face with parallel tramway cuttings from the face through the waste tips.

photo: workings   Workings

A view along the worked face seen in the previous photo.

photo: workings   Stone floor

One of the stone floors that may have been used for ore breaking or storage of ore awaiting transport (or possibly a foundation for a building).

In the background can be seen the abutments of a bridge that carried a tramway across the mine track to a tip.

photo: bridge abutments and tip   Bridge abutments and tip

The bridge carried a tramway from a working (shown in the next photo) over the exit track to the tip.

photo: workings   Workings

The large working associated with the bridge and tip in the previous photo.

photo: bridge abutments and tip   Bridge abutments and tip

The bridge abutments and tip seen from above.