The working of copper-arsenic alloys in the Early Bronze Age and the effect on the determination of provenance

1972 ◽  
Vol 38 ◽  
pp. 209-218 ◽  
Author(s):  
Hugh McKerrell ◽  
R. F. Tylecote

The earliest copper alloy of the British Bronze Age is arsenical copper, a material relatively short-lived when compared with the succeeding tin bronze but of no little importance when tracing the stages and progress of prehistoric metal working. Like tin, arsenic functions as a mild deoxidant and confers the useful property of work-hardening upon the metal. Copper-arsenic alloys need to be strengthened by cold working, and it was probably this requirement as much as any other that would have led to their eventual disuse and replacement by cast tin bronzes. The normal source of arsenic for such alloys is generally agreed as a constituent of the copper ore actually smelted, usually the grey tetrahedrite tennantite mineral (Coghlan and Case, 1957; Tylecote, 1962), although other suggestions have been made (Charles, 1967).

1998 ◽  
Vol 1 (1) ◽  
pp. 51-70 ◽  
Author(s):  
Mark Pearce

The paper attempts to integrate the results of chemical analyses, which are seriously underused in archaeological discourse, with other classes of information in order to try to interpret ancient metal working behaviour and knowledge within a semiotic framework, adopting the modernist premise that ancient metalworking was both rational and deliberate. A number of case studies from northern Italy is discussed. In the first it is noted that in the Copper Age Remedello culture arsenical copper was used for halberds and daggers while purer copper was used for flat axes; it is suggested that this distinction reflects deliberate choice and explanations are offered for it. The second case study regards the interpretation of the Pieve Albignola early Bronze Age axe hoard; evidence for the workshop practices of ancient bronzesmiths and for the use of axe preforms as ingots is discussed. The third case study concerns the swords and daggers of the middle and recent Bronze Age; finds context (tombs and wetlands) are discussed and it is suggested that metal analyses may indicate that sometimes these artefacts are not primarily functional.


2013 ◽  
Vol 79 ◽  
pp. 165-191 ◽  
Author(s):  
Andy M. Jones ◽  
Henrietta Quinnell

This paper describes the results from a project to date Early Bronze Age daggers and knives from barrows in south-west England. Copper alloy daggers are found in the earliest Beaker associated graves and continue to accompany human remains until the end of the Early Bronze Age. They have been identified as key markers of Early Bronze Age graves since the earliest antiquarian excavations and typological sequences have been suggested to provide dating for the graves in which they are found. However, comparatively few southern British daggers are associated with radiocarbon determinations. To help address this problem, five sites in south-west England sites were identified which had daggers and knives, four of copper alloy and one of flint, and associated cremated bone for radiocarbon dating. Three sites were identified in Cornwall (Fore Down, Rosecliston, Pelynt) and two in Devon (Upton Pyne and Huntshaw). Ten samples from these sites were submitted for radiocarbon dating. All but one (Upton Pyne) are associated with two or more dates. The resulting radiocarbon determinations revealed that daggers/knives were occasionally deposited in barrow-associated contexts in the south-west from c. 1900 to 1500 calbc.The dagger at Huntshaw, Devon, was of Camerton-Snowshill type and the dates were earlier than those generally proposed but similar to that obtained from cremated bone found with another dagger of this type from Cowleaze in Dorset: these dates may necessitate reconsideration of the chronology of these daggers


1992 ◽  
Vol 58 (1) ◽  
pp. 265-283 ◽  
Author(s):  
C. R. Musson ◽  
W. J. Britnell ◽  
J. P. Northover ◽  
C. J. Salter ◽  
P. Q. Dresser ◽  
...  

Small-scale rescue excavations at Llwyn Bryn-dinas hillfort, on the Welsh Borderland, showed that the earliest fortification belonged to the late Bronze Age, with radiocarbon dates in the late 9th and 8th centuries be. A terrace, subsequently cut into the rear of the rampart to accommodate a metal-working floor, was associated with a radiocarbon date centred in the late 3rd century bc. Detailed analysis of the metal-working debris suggests that copper-alloy casting, iron forging and possibly bronze production were carried out within a single workshop. The finds include a distinctive form of handled crucible. The industry appears to have been fairly small-scale, of short duration, and probably only designed to meet the internal needs of the hillfort population. The excavation adds significantly to the local evidence for metal-working during the later prehistoric period. A distinctive zinc-impurity pattern in the copper alloy and raw copper, previously identified in material from other sites nearby, confirms the suggestion of an Iron Age bronze-working industry based on a specific metal source in the north Powys area. In addition, analysis of the iron-working debris suggests the exploitation of a distinctive local ore body. The metal-working activity appears to have come to an abrupt end, possibly with the enlargement or local repair of the rampart. Later phases of activity include a final occupation deposit with an associated radiocarbon date centred in the mid 2nd century bc.


1963 ◽  
Vol 29 ◽  
pp. 258-325 ◽  
Author(s):  
Dennis Britton

This paper is concerned with the earliest use in Britain of copper and bronze, from the first artifacts of copper in the later Neolithic until the transition from the Early to the Middle Bronze Age, as marked by palstaves and haft-flanged axes. It does not attempt to deal with all the material, but instead certain classes of evidence have been chosen to illustrate some of the main styles of workmanship. These groups have been considered both from the point of view of their archaeology, and of the technology they imply.Such an approach requires on the one hand that the artifacts are sorted into types, their associations in graves and hoards studied, their distributions plotted, and finally a consideration of the evidence for their affinities and chronology. On the other hand there are questions also of interest that need a different standpoint. Of what metals or alloys are the objects made? Can their sources be located? How did the smiths set about their work? Over what regions was production carried out? If we are to understand as much as we might of the life of prehistoric times, then surely we should look at material culture from as many view-points as possible—in this case, the manner and setting of its production as well as its classification.


Author(s):  
Nina Morgunova ◽  
◽  
Airat Faizullin ◽  

The article summarizes the data on the initial stage of metal production in the Southern Urals of the Bronze Age. Lots of Yamnaya culture burial mounds with copper items inside were excavated near the Kargaly deposit in the Orenburg oblast. The variety and originality of tools forms indicate the independent nature of the Ural metallurgy in the early Bronze Age. The authors present new data that allows us to reconstruct the process of metal production at the Repin (early) stage of the Yamnaya culture and explain the beginning of this process by the development of the Kargaly copper ore deposit. Excavations of the Turganik settlement were carried out. Cultural layer 5 of the early Bronze Age is dated to 3800–3360 cal BC. It is characterized by ceramics and other artefacts of the Repin type. Fragments of Kargaly copper ore, slags and copper tools (knife, awls) were found in the layer. The traceological analysis of about approximately 100 items made of stone and animal bones was performed. 41 of them are related to metallurgy and metalworking. They represent tools of all metallurgical production stages, starting from metal extraction from ore to the processing of the finished copper product. Functional groups of products such as ore mortar, ore crushing hammers, casting molds, forging hammers, anvils, edges leveling tools, sharpening stones, and others have been identified. Stone artifacts from the burials were also studied, including ore crushing and forging hammers. No mining tools were found at the settlement. It is concluded that the ore was extracted and processed at the Kargaly deposit, located 70 km to the east, and then delivered to the settlement as an enriched concentrate. The settlement was seasonal. Metallurgical activity here took its place in the summer, since the main type of economic activity was nomadic pastoralism.


1994 ◽  
Vol 60 (S1) ◽  
pp. 30-31
Author(s):  
N Detenham

A sample of burnt clay (SBC 1), recovered from context 80, c. 0.5 m deep in the central pit of the umber ciicle, was examined by thermoluminescence (TL). The clay was expected to be either Bronze Age or Iron Age in date, being associated either with the timber circle or with the Iron Age metal working in the top of the central pit.The TL dating method measures the time that has elapsed since the heating of the material (which zeroes the TL signal). The measurement consists of firstly a determination of the radiation dose received by the sample since its heating (through the examination of its TL) and secondly an assessment of the rate at which the radiation dose was received (carried out by radioactivity measurements). Further descriptions of the method are given by Aitken (1985) and Zimmerman (1971).The outer 2 mm or more of the sample were cut away to remove those pans that had been exposed to light and to the alpha and beta activity of the surrounding sediment The interior piece was crushed, and fine grains of 2-10 mu were separated by suspension in dilute hydrochloric acid. The grains were then washed in water, methanol and acetone before deposition onto aluminium discs.


1992 ◽  
Vol 58 (1) ◽  
pp. 143-201 ◽  
Author(s):  
A. Whittle ◽  
R. J. C. Atkinson ◽  
R. Chambers ◽  
N. Thomas ◽  
M. Harman ◽  
...  

From 1946 to 1952. excavations were undertaken in advance of destruction by gravel workings of a series of Neolithic and Early Bronze Age monuments at Dorchester-on-Thames, Oxon. These included a long enclosure, a cursus, a double ditched henge, pit circles and ring ditches with primary and secondary cremation burials and a notable Beaker burial. Sites I, II, IV, V and VI, all pit circles or ring ditches, were published in 1951. This report describes sites III, VIII, IX, XI, XII, XIII and XIV. By the early 1950s much of the Neolithic complex had been quarried for gravel, and other adjacent areas subsequently were dug away. In 1981 the construction of a bypass led to the excavation of further surviving parts of the complex: site 1, a long D-shaped enclosure incorporated in the southern end of the cursus, and sites 2, 3 and 4.Both sets of sites are presented together, largely following the chronological scheme proposed for the complex by Bradley and Chambers (1988). Site VIII and site 1 are long enclosures of Earlier Neolithic date, with human remains. The latter site has a calibrated date of 3773–3378 BC. Site III is a cursus at least 1600 m long which cuts site VIII and incorporates site 1. A date of 3360–3040 BC was obtained from the primary fill of its ditch. Site XI is a three-phase ring ditch, perhaps successive enlargements of a barrow, but its innermost ditch is cut by a pit circle with cremations. There are Ebbsfleet sherds in the outermost ditch, and dates of 3037–2788 and 3024–2908 BC from the innermost, perhaps primary, ditch. Site XIV is a ring ditch succeeded by the Big Rings henge. Site 3 is a post circle between the ditches of the southern part of the cursus, with some secondary cremations. It has dates from the outer wood of its posts of 2890–2499, 2886–2491 and 2872–2470 BC; dates on charcoal associated with secondary cremations were 2880–2470, 2870–2460 and 2123–1740 BC. Site 2 is a penannular ring ditch with a primary date of 2912–2705 BC, and secondary cremations. Site XII is a notable Beaker burial within a two-phase ring ditch. An adult man was laid crouched on a bier and was accompanied by a fine W/MR beaker, a stone bracer, a tanged copper knife and a small riveted knife with at least one rivet of tin bronze. Traces of a stretcher-like feature were found in an adjacent pit which cuts the inner ring ditch. Site XIII, the Big Rings, is a large double ditched enclosure with central bank and opposed entrances. There was Beaker pottery in the primary fill of the inner ditch, but very little material was found in either ditch, and there were minimal features in the interior, part of which was stripped. Site 4 consists of two conjoined ring ditches within the southern end of the cursus. It encloses cremation burials. One, accompanied by an awl and Collared Urn, has a date of 2290–1910 BC. Traces of a ditched field system (originally referred to as a droveway, site IX) of later Bronze Age date were found cutting sites III, VIII and XIII, and paired ditches on site 1 may be related.The complex is related to its local and regional context, and the sequence of development is discussed. A timescale measured in generations is advocated, with phases of continuity and episodes of little activity both represented. Several aspects of monuments are considered: their differing scales including the monumental, their ability to endure and create tradition, and finally the choice of designs, from the locally customary to the exotic.


1998 ◽  
Vol 93 ◽  
pp. 91-102 ◽  
Author(s):  
Helen Mangou ◽  
Panayiotis V. Ioannou

110 copper-based objects from various sites on Crete, covering the whole of the Bronze Age, were analysed for their chemical content (12 elements) by Atomic Absorption Spectrometry. The results indicate that during the Early Bronze Age arsenical copper was mainly used while in the Middle Bronze Age copper, arsenical copper, and arsenical bronze were in use with about equal frequency. During the Late Bronze Age normal bronze was used when required. The copper technology in each era was the same at all of the sites examined. Metallographic examination of four triangular daggers of the Early Bronze Age showed that they had been cast. In the case of three Late Bronze Age hydriae, the component sheets had been hammered and annealed.


Alloy Digest ◽  
1974 ◽  
Vol 23 (9) ◽  

Abstract Copper No. 142 is an arsenical copper deoxidized with phosphorus. Its capacity is excellent for hot forming or cold working and it has excellent joinability characteristics for soldering, brazing and gas-shielded arc welding. Its leading use is tubing for condensers and heat exchangers. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-284. Producer or source: Copper and copper alloy mills.


Sign in / Sign up

Export Citation Format

Share Document