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  1. Copper extraction - Wikipedia

  2. The Extraction of Copper - Chemistry LibreTexts

  3. Innovations: Introduction to Copper: Mining & Extraction

  4. copper extraction and purification - chemguide

  5. Copper processing | Definition, History, & Facts | Britannica

  6. A new way of extracting copper - MIT News

  7. Extraction Of Copper | Mining, Concentration, Smelting - BYJU'S

  8. Turning Copper Ore into Copper: What are the Processes?

  9. Copper Extraction and Purification | ChemKey