Large quantities of locally occurring fireclay were also exploited, as well as ganister ( a clay used to make refractory furnace linings ).
3.
Ingots of gold would have been easier to transport than dust or nuggets, although a high-temperature refractory furnace will have been needed to melt the gold, which has a melting point of 1064 �C . Pliny mentions such special furnaces in his Naturalis Historia.
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