Chemical traces and metallurgical analyses of copper artifacts from Lothal and Mohenjo-daro have established that while the Harappans utilized Rajasthan's Khetri mines, they also imported heavy volumes of copper ingot variants containing specific nickel impurities from which foreign trade zone?

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Sourcing and chemical finger-printing studies show that Harappan copper objects share a high correlation of trace elements and specific nickel compositions with ancient copper deposits excavated in Oman (historically called Magan in cuneiform literature). This chemical link confirms regular maritime distribution routes across the Arabian Sea.

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