answers: during the 2nd millennium BC
context: are found in the Geum River basin. The time that iron production begins is the same time that complex chiefdoms of Proto-historic Korea emerged. The complex chiefdoms were the precursors of early states such as Silla, Baekje, Goguryeo, and Gaya Iron ingots were an important mortuary item and indicated the wealth or prestige of the deceased in this period. The history of metallurgy in the Indian subcontinent began during the 2nd millennium BC. Archaeological sites in India, such as Malhar, Dadupur, Raja Nala Ka Tila, Lahuradewa, Kosambi and Jhusi, Allahabad in present-day Uttar Pradesh show iron implements in the period </s> of iron smelting predates the emergence of the Iron Age proper by several centuries. R. Tewari (2003) radiocarbon dated iron artefacts in Uttar Pradesh, including furnaces, tuyeres and slag between c. 1800 and 1000 BCE. Iron using and iron working was prevalent in the Central Ganga Plain and the Eastern Vindhyas from the early second millennium BCE. The beginning of the use of iron has been traditionally associated with the eastward migration of the later Vedic people, who are also considered as an agency which revolutionised material culture particularly in eastern Uttar Pradesh and Bihar. Scholar Rakesh Tewari states that </s> charcoal, and glass were mixed in a crucible and heated until the iron melted and absorbed the carbon. The first crucible steel was the wootz steel that originated in India before the beginning of the common era. Wootz steel was widely exported and traded throughout ancient Europe, China, the Arab world, and became particularly famous in the Middle East, where it became known as Damascus steel. Archaeological evidence suggests that this manufacturing process was already in existence in South India well before the common era. Zinc mines of Zawar, near Udaipur, Rajasthan, were active during 400 BCE. There are references
question: when did the use of iron began in the subcontinent