A Midianite supervisor at Timna confers with an Egyptian clerk on the progress of quotas of Malachite fragments being harvested from the cliff face, to be later carried to a smeltry where they will become Copper. A single miner could harvest enough Malachite in a day to yield eight pounds of Copper at the smeltry. (pp.51-52, "Exploiting Timna's Cliffs for the Pharaoh," Percy Knauth. The Metalsmiths [The Emergence of Man Series]. New York. Time-Life Books. 1974)
