The Indus Valley people obtained copper from the Khetri mines located in the northeastern part of Rajasthan. Archaeological evidence suggests the mines were in operation during the Mature Harappan phase between 2600 BCE and 1900 BCE. Ore was brought to the valley civilization sites and melted in furnaces to produce both tools and decorative items. Copper was a prized metal used extensively in urban Harappan centers.
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