On April 7, 2026, the Archaeological Science Quarterly reported a major breakthrough in dating methodology with the application of Gallium-71 isotopic chronometry. This new technique was used to analyze slag remains from the Chambal Valley, refining the timeline of the enigmatic 'Copper Hoard' culture. The results push back the emergence of high-purity copper smelting in Central India to approximately 3600 BCE, nearly five centuries earlier than previously estimated via traditional radiocarbon dating of associated organics.
The study highlights how the specific isotopic signature of gallium, often found as a trace element in copper ores, acts as a high-resolution clock for the cooling of molten metals. This methodology allows archaeologists to bypass the 'old wood' problem in carbon dating, providing the first direct absolute dates for the metallurgical processes themselves and establishing the Chambal Valley as a primary global center for independent Neolithic metalwork.