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Ystumtuen Mine, Ystumtuen, Cwmrheidol, Ceredigion, Wales, UKi
Regional Level Types
Ystumtuen MineMine
Ystumtuen- not defined -
Cwmrheidol- not defined -
Ceredigion- not defined -

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Latitude & Longitude (WGS84): 52° 23' 31'' North , 3° 51' 43'' West
Latitude & Longitude (decimal): 52.39216,-3.86216
GeoHash:G#: gcm601ewm
UK National Grid Reference:SN733788
Locality type:Mine
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
Capel Bangor256 (2017)7.4km
Llanilar1,085 (2017)11.8km
Pontrhydfendigaid712 (2017)12.2km
Bow Street1,572 (2017)12.5km
Penparcau3,088 (2011)14.4km
Other/historical names associated with this locality:Dyfed; Cardiganshire

Approaching the site from the village of Ystumtuen the narrow lane climbs steeply and then turns sharply left defining the eastern and northern boundaries of the workings. In all the site is approximately 300m x 100m aligned east-west, divided into 2 roughly equal halves by a north-south farm track.

Within the bend of the road is an east-west aligned open working associated with small spoil heaps. In the middle of the site on the southern edge beside the farm track is a fenced shaft collar. The site generally has the appearance of many low mounds of spoil now grassed over.

At the time of this visit (Dec 2017) the site was being used as pony paddocks and no closer inspection was possible other than from the road.

It is however also possible that work took place to the north of the road. Though most of that is now tree covered there is a place occupied by farm machinery that has a prominent mound of what could be spoil.

Regions containing this locality

Eurasian PlateTectonic Plate
British IslesGroup of Islands

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

6 valid minerals.

Detailed Mineral List:

Formula: PbS
Formula: FeS2
Formula: FeS2
Formula: SiO2
Formula: ZnS
Formula: SrCO3

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
AmBnXp, with (m+n):p = 1:2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

C StrontianiteSrCO3
O StrontianiteSrCO3
O QuartzSiO2
Si QuartzSiO2
S MarcasiteFeS2
S PyriteFeS2
S GalenaPbS
S SphaleriteZnS
Fe MarcasiteFeS2
Fe PyriteFeS2
Zn SphaleriteZnS
Sr StrontianiteSrCO3
Pb GalenaPbS

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

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]

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]

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, used under Creative Commons Attribution 4.0 License

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