This curious looking copper alloy object, recorded with the Portable Antiquities Scheme as SUR-9302E5, has a lopsided convex subrectangular body, four tapering projections and a rough, unworked surface. It is called a casting jet and comprises a solidified lump of the metal retained in the opening (gate) and channels of a two-piece stone mould, which has been trimmed away from the finished object following production. Similar waste products can be the result of non-ferrous metalworking in many periods, but this characteristic sub-conical shape with projecting runners is usually associated with the production of socketed axes of later Bronze Age date (c. 1000-700 BC). These objects can be clearly dated when recovered in hoards alongside identifiable artefacts but they can also be encountered singly or in groups of otherwise undiagnostic scrap such as that intended for recycling by itinerant metalworkers, where the dating is more indirect and problematic.
What is unusual about this particular example is that it has four runners as opposed to the usual two, which is the much more commonly encountered form. This feature is regarded as being associated with the production of socketed axes of the South Wales (Stogursey) type, which have a distinctive rectangular mouth and used a four-runner casting process. This type is considered to be part of the Ewart Park metalworking tradition (Metalworking phase XII) corresponding to Needham’s (1996) Period 6-7 (c. 1000-700 BC) and more specifically dates to around 950 – 750 BC.
South Wales type axeheads are, as the name suggests, most commonly found in South Wales, where this form of distinctive casting waste is known from base metal hoards as well as from stray finds. Outside of this core area, a few stone moulds and other evidence relating to production of the type are known from North West England, Cornwall and southern England, but finds relating to the type outside of Wales are rare. In the context of this distribution, the presence of this evidence for manufacture of the type in Surrey would seem to be extremely unusual. Unfortunately this object was not found in association with any other contemporary finds which could help provide further context. Although not providing definitive evidence, does this find still suggest potential extension of the distribution for this type into south eastern England – or perhaps is it better interpreted as being the result of long-distance trading of scrap metal and the travels of itinerant metal workers during the late Bronze Age? In the context of these ideas it is certainly worth highlighting that the findspot location was very close to the present day course of the River Mole within the wider Thames watershed. This may suggest both association with a likely contemporary trade route as well as the find potentially being part of a wider pattern of votive deposition associated with waterways in this area during this period.
With thanks to Adam Gwilt at Amgueddfa Cymru – Museum Wales.
Reference: Needham, S.P. 1996, Chronology and periodisation in the British Bronze Age Copenhagen: Wiley