| 11. | There are many more varieties of smelting processes, including the Kivset, Ausmelt, Tamano, EAF, and BF.
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| 12. | The cost of obtaining ore as well as limestone needed during the smelting process was high.
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| 13. | During ancient times, due to impurities in the smelting process, gold frequently turned a reddish color.
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| 14. | Ferrous and non-ferrous smelting processes produce different slags.
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| 15. | The smelting process generated large amounts of waste.
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| 16. | Demand for charcoal in the smelting process rapidly depleted Gwennap's ancient woodland, leaving a wild, moorland, landscape.
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| 17. | High electrical conductivity coppers are distinct from coppers deoxidized by the addition of phosphorus in the smelting process.
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| 18. | Arsenic and the other byproducts of the smelting process contaminated the soil, making the area resemble a moonscape.
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| 19. | These metal sulphides survived from oxidizing stage before smelting and therefore may also indicate a multi-stage smelting process.
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| 20. | Other forms of tin ores are less abundant sulfides such as stannite that require a more involved smelting process.
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