Mining The mineral wealth of Britain was well-known prior to the Roman invasion and was one of the expected benefits of conquest. All mineral extractions were state-sponsored and under military control, as mineral rights belonged to the emperor. His agents soon found substantial deposits of gold, copper, and lead in Wales, along with some
zinc and silver. Gold had been mined at
Dolaucothi before the invasion, but
Roman engineering was applied to greatly increase production of gold and other metals. This continued until the process was no longer practical or profitable, and the mine was abandoned. Modern scholars have made efforts to quantify the value of these extracted metals to the
Roman economy, and to determine the point at which the Roman occupation of Britain was "profitable" to the Empire. While these efforts have not produced definitive results, the benefits to Rome were substantial. The gold production at Dolaucothi alone may have been of economic significance.
Industrial production The production of goods for trade and export in Roman Britain was concentrated in the south and east, with virtually none situated in Wales. This was largely due to circumstance, with iron forges located near iron supplies,
pewter (tin with some lead or copper) moulds located near the tin supplies and suitable soil (for the moulds), clusters of
pottery kilns located near suitable clayey soil, grain-drying ovens in agricultural areas where sheep were raised (for wool), and salt production concentrated in its historical pre-Roman locations. Glass-making sites were located in or near urban centres. However, as Roman influence grew, the army was able to obtain tiles from civilian sources which located their kilns in the lowland areas containing good soil, and then shipped the tiles to wherever they were needed.
Romanization The Romans occupied the whole of the area now known as Wales, where they built
Roman roads and
castra, mined gold at
Luentinum and conducted commerce, but their interest in the area was limited because of the difficult geography and shortage of flat agricultural land. Most of the Roman remains in Wales are military in nature.
Sarn Helen, a major highway, linked the North with South Wales. The area was controlled by
Roman legionary bases at
Deva Victrix (modern
Chester) and
Isca Augusta (
Caerleon), two of the three such bases in Roman Britain, with roads linking these bases to
auxiliaries' forts such as
Segontium (
Caernarfon) and Moridunum (
Carmarthen). Furthermore, South-east Wales was the most Romanised part of the country. It is possible that Roman estates in the area survived as recognisable units into the eighth century: the kingdom of Gwent is likely to have been founded by direct descendants of the (Romanised) Silurian ruling class ' The best indicators of Romanising acculturation is the presence of urban sites (areas with towns,
coloniae, and tribal
civitates) and
villas in the countryside. In Wales, this can be said only of the southeasternmost coastal region of
South Wales. The only
civitates in Wales were at
Carmarthen and
Caerwent. There were three small urban sites near Caerwent, and these and
Roman Monmouth were the only other "urbanised" sites in Wales. In the southwestern homeland of the
Demetae, several sites have been classified as
villas in the past, but excavation of these and examination of sites as yet unexcavated suggest that they are pre-Roman family homesteads, sometimes updated through Roman technology (such as stone masonry), but having a native character quite different from the true Roman-derived
villas that are found to the east, such as in
Oxfordshire. Perhaps surprisingly, the presence of Roman-era Latin inscriptions is not suggestive of full Romanisation. They are most numerous at military sites, and their occurrence elsewhere depended on access to suitable stone and the presence of stonemasons, as well as patronage. The Roman fort complex at
Tomen y Mur near the coast of northwestern Wales has produced more inscriptions than either
Segontium (near modern Caernarfon) or
Noviomagus Reginorum (
Chichester).
Hill forts In areas of civil control, such as the territories of a
civitas, the fortification and occupation of
hill forts was banned as a matter of Roman policy. However, further inland and northward, a number of pre-Roman hill forts continued to be used in the Roman Era, while others were abandoned during the Roman Era, and still others were newly occupied. The inference is that local leaders who were willing to accommodate Roman interests were encouraged and allowed to continue, providing local leadership under local law and custom. ==Religion==