Latitude & Longitude (WGS84):	52° 26' 44'' North , 3° 28' 37'' West
Latitude & Longitude (decimal):	52.44563,-3.47715
GeoHash:	G#: gcmd2gkjb
UK National Grid Reference:	SN997841
Köppen climate type:	Cfb : Temperate oceanic climate
Other/historical names associated with this locality:	, Montgomeryshire

According to MEMOIRS OF THE GEOLOGICAL SURVEY.
SPECIAL REPORTS ON THE MINERAL RESOURCES OF GREAT BRITAIN.
VOL . XX. — LEAD AND ZINC. THE MINING DISTRICT OF NORTH CARDIGANSHIRE AND WEST MONTGOMERYSHIRE.
O. T. JONES, M.A., D.SC., PROFESSOR OF GEOLOGY AND MINERALOGY, VICTORIA UNIVERSITY, MANCHESTER (Late of the University College of Wales, Aberystwyth):

"DOLWEN OR DEBROKE.
(6-in. Sheet, Card 12 N.W., Long. 3°47’30 Lat. 52°23'15

Dolwen mine stands on the spur between the Myherin and Mynach valleys, at an altitude of nearly 1400 ft. There is no road within a considerable distance of the mine and access to it is difficult. In spite of these handicaps it maintained a fairly high output of ore for several years. The lode ranges S.W. towards Tygwyn or Mynach Vale mine, and dips to the south-east at 65°
to 70°. It is several feet wide and consists of brecciated mudstones belonging to the Frongoch formation, with quartz.
The main workings were carried out from an underlie shaft on the summit of the hill, and were partially drained by a shallow adit. The lode cannot be traced continuously in a south-westerly direction, but at a distance of half a mile, near the River Mynach, there are old shafts and an adit (about
870 O.D.) on a similar lode and having the same dip and strike. At this point it enters the Tygwyn property on the south side of the stream."

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Silurian 419.2 - 443.8 Ma ID: 3185808	Paleozoic sedimentary rocks Age: Silurian (419.2 - 443.8 Ma) Lithology: Sedimentary rocks Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]
Silurian 419.2 - 443.8 Ma ID: 3160805	Silurian claystone Age: Silurian (419.2 - 443.8 Ma) Lithology: Major:{claystone}, Minor{sandstone,limestone} Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]
Llandovery 433.4 - 443.8 Ma ID: 2034671	Llandovery Rocks (Undifferentiated) Age: Llandovery (433.4 - 443.8 Ma) Lithology: Mudstone, siltstone and sandstone Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

External Links