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The Iron Age is the final epoch of the three historical Metal Ages, after the Copper and Bronze Ages. It has also been considered as the final Age of the three-age division starting with prehistory and progressing to protohistory. In this usage, it is preceded by the Stone Age and Bronze Age. These concepts originated in describing Iron Age Europe and the Ancient Near East, but they now include other parts of the Old World.
Smelting is a process of applying heat and a chemical reducing agent to an ore to extract a desired base metal product. It is a form of extractive metallurgy that is used to obtain many metals such as iron, copper, silver, lead and zinc. Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gases or slag and leaving the metal behind. The reducing agent is commonly a fossil fuel source of carbon, such as carbon monoxide from incomplete combustion of coke—or, in earlier times, of charcoal. The oxygen in the ore binds to carbon at high temperatures as the chemical potential energy of the bonds in carbon dioxide is lower than the bonds in the ore.
The Igbo people are an ethnic group in Nigeria. They are primarily found in Abia, Anambra, Ebonyi, Enugu, and Imo States. A sizable Igbo population is also found in Delta and Rivers States. Ethnic Igbo populations are found in Cameroon, Gabon, and Equatorial Guinea, as migrants as well as outside Africa. There has been much speculation about the origins of the Igbo people, which are largely unknown. Geographically, the Igbo homeland is divided into two unequal sections by the Niger River—an eastern and a western section. The Igbo people are one of the largest ethnic groups in Africa.
Nsukka is a town and a Local Government Area in Enugu State, Nigeria. Nsukka shares a common border as a town with Edem, Opi, Ede-Oballa, and Obimo.
Enugu is the capital city of Enugu State in Nigeria. It is located in southeastern part of Nigeria. The city had a population of 820,000 according to the last Nigerian census. The name Enugu is derived from the two Igbo words Énú Ụ́gwụ́, meaning "hill top", denoting the city's hilly geography. Enugu acquired township status in 1917 and was called Enugwu-Ngwo, but because of the rapid expansion towards areas owned by other indigenous communities, the city was renamed Enugu in 1928.
The University of Nigeria, commonly referred to as UNN, is a federal university located in Nsukka, Enugu State, Eastern part of Nigeria. Founded by Nnamdi Azikiwe in 1955 and formally opened on 7 October 1960, the University of Nigeria has three campuses in Enugu State–Nsukka, Enugu, and Ituku-Ozalla – and the Aba campus in Abia State.
Copper extraction refers to the methods used to obtain copper from its ores. The conversion of copper ores consists of a series of physical, chemical and electrochemical processes. Methods have evolved and vary with country depending on the ore source, local environmental regulations, and other factors.
A bloomery is a type of metallurgical furnace once used widely for smelting iron from its oxides. The bloomery was the earliest form of smelter capable of smelting iron. Bloomeries produce a porous mass of iron and slag called a bloom. The mix of slag and iron in the bloom, termed sponge iron, is usually consolidated and further forged into wrought iron. Blast furnaces, which produce pig iron, have largely superseded bloomeries.
Enugu State is a state in the South-East geopolitical zone of Nigeria, bordered to the north by the states of Benue and Kogi, Ebonyi State to the east and southeast, Abia State to the south, and Anambra State to the west. The state takes its name from its capital and largest city, Enugu. The city acquired township status in 1917 and was called Enugwu-Ngwo. Due to the rapid expansion towards areas owned by other indigenous communities, it was renamed Enugu in 1928.
Christopher Uchefuna Okeke, also known as Uche Okeke, was an illustrator, painter, sculptor, and teacher. He was an art and aesthetic theorist, seminal to Nigerian modernism.
Ferrous metallurgy is the metallurgy of iron and its alloys. The earliest surviving prehistoric iron artifacts, from the 4th millennium BC in Egypt, were made from meteoritic iron-nickel. It is not known when or where the smelting of iron from ores began, but by the end of the 2nd millennium BC iron was being produced from iron ores in the region from Greece to India, and sub-Saharan Africa. The use of wrought iron was known by the 1st millennium BC, and its spread defined the Iron Age. During the medieval period, smiths in Europe found a way of producing wrought iron from cast iron, in this context known as pig iron, using finery forges. All these processes required charcoal as fuel.
Iron metallurgy in Africa developed within Africa; though initially assumed to be of external origin, this assumption has been rendered untenable; archaeological evidence has increasingly supported an indigenous origin. Some recent studies date the inception of iron metallurgy in Africa between 3000 BCE and 2500 BCE. Archaeometallurgical scientific knowledge and technological development originated in numerous centers of Africa; the centers of origin were located in West Africa, Central Africa, and East Africa; consequently, as these origin centers are located within inner Africa, these archaeometallurgical developments are thus native African technologies.
Archaeometallurgical slag is slag discovered and studied in the context of archaeology. Slag, the byproduct of iron-working processes such as smelting or smithing, is left at the iron-working site rather than being moved away with the product. As it weathers well, it is readily available for study. The size, shape, chemical composition and microstructure of slag are determined by features of the iron-working processes used at the time of its formation.
Taruga is an archeological site in Nigeria famous for the artifacts of the Nok culture that have been discovered there, some dating to 600 BC, and for evidence of very early iron working. The site is 60 km southeast of Abuja, in the Middle Belt.
Obimo is a town in the Nsukka local government area of Enugu state in Nigeria. Its full name is Obimo Asebere. It is made up of five communities:
Lejja is a community comprising 33 villages in Enugu State of South-Eastern Nigeria. It is populated by the Igbo people and located about 14 Kilometers from Nsukka. It is the location of a prehistoric archaeological site which contains iron smelting furnaces and slag that dates back to 2000 BC. The village square at Otobo ugwu which is likely the first village square in Lejja that contains over 800 blocks of slag with an average weight, between 34 and 57 kg. Geophysical investigations have located buried iron slag in several other locations in the community.
The archaeology of Igbo-Ukwu is the study of an archaeological site located in a town of the same name: Igbo-Ukwu, an Igbo town in Anambra State in southeastern Nigeria. Archaeological excavations revealed bronze artifacts dated to the 9th century A.D. The site was initially discovered by Isiah Anozie in 1939 while digging a well in his compound. As a result of these findings, three excavation areas at Igbo-Ukwu were opened in 1959 and 1964 by Charles Thurstan Shaw: Igbo Richard, Igbo Isaiah, and Igbo Jonah. Excavations revealed more than 700 high quality artifacts of copper, bronze and iron, as well as about 165,000 glass, carnelian and stone beads, pottery, textiles and ivory beads, cups, and horns. The Igbo-Ukwu finds are the oldest bronze artifacts known in West Africa and were manufactured centuries before the emergence of other known bronze producing centers such as those of Ife and Benin. The bronzes include numerous ritual vessels, pendants, crowns, breastplates, staff ornaments, swords, and fly-whisk handles.
Kemondo Iron Age Sites or KM2 and KM3 are Early Iron Age complex industrial archaeological sites in Kemondo ward, Bukoba Rural District, Kagera Region, Tanzania, excavated by a team led by archaeologist Peter Schmid in the late 1970s and 1980s. The excavations aimed at better understanding the iron smelting process and its ritual aspects in East Africa. At the KM2 and KM3 sites, Schmidt tested the hypothesis that the high combustion temperature of furnaces, discovered to be between 1,350–1,400 °C (2,460–2,550 °F), was caused by the preheating of air blasts. Preheating has been suggested to be a distinct feature of African Early Iron Age smelting techniques by ethnographic observations of the Haya people of northwestern Tanzania.
Nsukka is a region located in Enugu State of Southeastern Nigeria that has drawn particular archaeological interest. This area has yielded several examples of iron, metal, clay, and stone production that have contributed to the country’s development over the years. In the territory referred to as Igboland, in which Nsukka resides, Alumona is recognized as a focal point for metal working, whilst Opi, Obimo, Lejja, Orba, Nrobo, Onyohor, Ekwegbe, and Umundu are related back to iron smelting.
The archaeology of Lejja, Nigeria refers to a suite of archaeological discoveries made in and around the ancient town of Lejja, located in Enugu State, southeastern Nigeria. The Lejja archaeological suite is an important site for the study of the Nsukka-Awka-Orlu-Umuleri cultural complex, which flourished in the region from about 2000 BCE to 200 CE. Excavations at the site have revealed evidence of early agricultural practices, iron smelting, and a complex social structure.
References
- ↑ Holl, Augustin F. C. (6 November 2009). "Early West African Metallurgies: New Data and Old Orthodoxy". Journal of World Prehistory. 22 (4): 415–438. doi:10.1007/s10963-009-9030-6. S2CID 161611760.
- ↑ etc, Thurstan Shaw, ed. (1995). The Archaeology of Africa : food, metals and towns (New ed.). London: Routledge. pp. 437–441. ISBN 9780415115858.
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