Although there is nothing directly comparable with Dolaucothi in Britain in terms of the extensive hydraulic systems, there are many other known Roman mines in Britain, some of which seem to show traces of hydraulic activity. They include the extensive remains of lead mining at Charterhouse in the Mendips, Halkyn in Flintshire, and many areas in the Pennines. Dolaucothi is most directly comparable with gold mines in the Carpathian mountains of Transylvania in modern Romania, at Rosia Montana, and with the Roman gold mines in north-west Spain, such as the very much larger site of alluvial mining at Las Médulas and Montefurado. The Romans may have used slave labour taken from the local area to work the mine, although the army itself was probably most directly involved, especially for their engineering skills in surveying and building aqueducts, reservoirs and water tanks or cisterns.