Mercury was often used in mining, to extract precious metals like gold and silver from their ores.

Sales of the technology for extracting precious metals from industrial waste make up the remaining $30,000.

The solution is collected and processed to extract valuable metals.

Just's US Patent 814,294 was a new way to extract precious metals from their ores.

Over all, it takes six months to extract metals from a cellphone, compared with a month to melt and refine jewelry.

Belt filters to extract precious metals in mining.

Dump leaching is an industrial process to extract precious metals and copper from ores.

Because we didn't show them how to extract metals.

In general, this process has been tried more often for extracting heavy metals than for organics.

Their furnaces were electric arc smelters, one of the first viable methods for extracting metals.