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4. Luminescence Dating of Archaeological Materials
July 13, Trade Release. On July 14th , OSHA published a final rule revising the beryllium standard for general industry that maintains protection for employees while insuring that the standard is well understood and compliance is simple and straightforward. This standard will affect approximately 50, workers employed in general industry.
Based upon information available as of this date, EPA has determined that the unacceptable levels of risk to current and future users of the Midvale Slag.
The topic of early iron-metallurgy in sub-Saharan Africa encompasses both studies of the technology and archaeology of indigenous iron-production, and also an understanding of the role that iron production played in African societies before European colonization. Some evidence from historical linguistics suggests that the Nok culture of Nigeria may have practiced iron smelting from as early as BC;   archaeological evidence dates this not later than BC.
The Bantu expansion spread the technology to Eastern and Southern Africa during c. Although the origins of iron working in Africa have been the subject of scholarly interest since the s, it is still not known whether this technology diffused into sub-Saharan Africa from the Mediterranean region, or whether it was invented there independently of iron working elsewhere. The invention of radiocarbon dating in the late s enabled dating of metallurgical sites by the charcoal fuel used for smelting and forging.
By the late s some surprisingly early radiocarbon dates had been obtained for iron smelting sites in both Nigeria and central Africa Rwanda, Burundi , reviving the view that iron-making was independently invented in sub-Saharan Africa. In the s, evidence was found of Phoenician iron smelting in the western Mediterranean — BC ,  though specifically in North Africa it seems to date only to the 5th to 4th centuries BC, or the 7th century BC at the earliest.
According to archaeometallurgist Manfred Eggert, “Carthage cannot be reliably considered the point of origin for sub-Saharan iron ore reduction. This funded both the conference on early iron in Africa and the Mediterranean  and a volume, published by UNESCO, that generated some controversy because it included only authors sympathetic to the independent-invention view. Two reviews of the evidence from the mids found major technical flaws in the studies claiming independent invention, raising three major issues.
Many of the dates from Niger, for example, were on organic matter in potsherds that were lying on the ground surface together with iron objects.
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A new early lead smelting site was discovered by accident in July when returning from looking for something else. The site comprises a discrete mound of slag, standing out in the landscape because of its short green grass surrounded by the more usual course pale brown grasses. It comprises a smooth-profiled mound just under 20m by 8m across and 1m high, with a steep downslope side and a flatter top. The shape of the mound strongly suggests that there was a hearth near its upslope edge on the flat top, rather than this being a dump of material placed here from elsewhere in advance of further processing.
Similarly, the smooth sides indicate there has been no attempt to remove material for washing, further smelting or transport to another site.
We also share information about your use of our site with our social media, Published in: Luminescence Dating in Archaeology, Anthropology, and Geoarchaeology (TL) ages, the field of Luminescence Dating has reached a level of maturity. GA () Thermoluminescence dating of archaeometallurgical slags.
A Nature Research Journal. ON examining the magnetic properties of some ores and minerals, I observed that a specimen of ore furnace slag from copper smelting was strongly polar magnetic. Reprints and Permissions. Magnetism in Copper Slags. Nature 6, 43 Download citation.
Primary research on the bronze technology of Lower Xiajiadian Culture in northeastern China
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Snorup situated in SW Jutland comprising 23 or more smelting sites with remains of slag-pit furnaces dating for the period AD (Voss, b).
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Magnetism in Copper Slags
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blasting operations using slags that contain trace amounts of beryllium. The compliance date of this final standard as modified is September 14,
Science Explorer. Frequently Asked Questions. Multimedia Gallery. Park Passes. Technical Announcements. Employees in the News. Emergency Management. Survey Manual. Slags are nonmetallic byproducts of many metallurgical operations and consist primarily of calcium, magnesium, and aluminum silicates in various combinations. Iron and steel slags are coproducts of iron and steel manufacturing. In the production of iron, the blast furnace is charged with iron ore, fluxing agents, usually limestone and dolomite, and coke as fuel and the reducing agent.
The iron ore is a mixture of iron oxides, silica, and alumina.
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Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated. Show Related Articles. View License. Show full item record. Hauptmann, A Modarressi-Tehrani, D. Der Anschnitt, Beiheft 26 , pp. The site was almost completely excavated from to and ten roasting hearths, six double furnaces, a number of pits of variable size, form and function, and three separate slag dumps have been recorded. The use of this smelting site covers the whole period of the Middle Bronze Age from the 16th to the 13th century BC and might extend as far as the 11th century BC.
The aim of this archaeometallurgical study is the reconstruction of the smelting process at this site and the discovery of possible diachronic changes or developments in the technology of smelting during the different phases of use.