Thus the percentage recovery of metal from the ore was much higher than in the primitive process where the semi-vitrified gangue and half-smelted ore are typically rich in prills of copper and copper minerals.
Source: wiktionary
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Thus the percentage recovery of metal from the ore was much higher than in the primitive process where the semi-vitrified gangue and half-smelted ore are typically rich in prills of copper and copper minerals.
Source: wiktionary