Once the gold ore is extracted, it undergoes a series of refining techniques to purify and eliminate impurities. The refining ...

XXX underscoring the painstaking process to obtain gold. Even so ... Gold ore is melted with copper ore at a smelting factory in Ehime Prefecture to be refined to 99.99 percent purity for use ...

as well as settling and purification basins and furnaces for smelting and extracting gold. This thorough process involved crushing and grinding the quartz, filtering and settling in special basins ...