With its wealth of rock types and their abundance in the landscape, mining and quarrying have long been significant activities in the Lake District economy. In Neolithic times, the Lake District was a major source of stone axes, examples of which have been found all over Britain. The primary site, on the slopes of the Langdale Pikes, is sometimes described as a "stone axe factory" of the Langdale axe industry. Some of the earliest stone circles in Britain are connected with this industry.