Coed y Brenin

Porphyry copper deposit in Wales, United Kingdom of Great Britain and Northern Ireland

Names and other identifiers

GMRAP ID 3105
Tract name Western European Caledonian (150pCu6007)
Site status deposit

Geographic location

Country United Kingdom of Great Britain and Northern Ireland
State or province Wales
Geographic location -3.931954, 52.814408
Geologic map unit -3.931954, 52.814408
Nearby data

Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range Early Ordovician
Age reference geologic inference
Minerals bornite, chalcopyrite, malachite, molybdenite, pyrite, tennantite, tyrolite
Associated rocks sedimentary rocks, intermediate to basic igneous rocks, porphyritic microtonalite, volcanic rocks
Tectonic setting continental margin
Stratigraphic age Early Ordovician

Commodity and development information

Development status Prospect
Major commodities Cu
Tonnage (Mt) 200Mt
Cu grade (%) 0.3%
Contained copper 600,000t
Gold-Moly ratio -9999

Reference information

Comments Upper Cambrian sedimentary rocks have been pyritized, and a halo of pyritization surrounds the copper deposit. Afon Wen Fault system is located near the deposit and was active after the lower Ordovician volcanics were emplaced. Copper ores occur as thin veinlets and disseminations. The deposit was discovered in the late 1960s by Riofinex Ltd., and drilling indicated at least 200 million tons of reserves carrying more than 0.3% copper. Leaching of copper from the deposit by groundwaters led to the formation of a 70-acre peat deposit so rich with copper that it was profitable to strip the peat, ash it in a stone kiln, and send the ashes for smelting.
Study area name Europe
References Mason (n.d.); Rice and Sharp (1976); Shepherd and Allen (1985)
Site reference Sutphin and others (2013)