Metal tools first appeared in Wales about 2500 BC, initially copper followed by bronze. The climate during the Early Bronze Age (c. 2100-1400 BC) is thought to have been warmer than at present, as there are many remains from this period in what are now bleak uplands. Much of the copper for the production of bronze probably came from the copper mine on the Great Orme, where prehistoric mining on a very large scale dates largely from the middle Bronze Age. In particular copper from the Great Orme mines appears to have been used for the production of bronze implements of the Acton Park Complex, named after a hoard found at Acton Park near Wrexham. These tools, particularly axeheads, were developed towards the end of the Early Bronze Age and are innovative in both metallurgy and design. They were widely exported, with examples being found along the continental coast from Brittany to north Germany.