We're after pure gold, but rock that contains gold also includes lots of other materials such as quartz, calcite ... We used mercury to actually extract the gold from the powdered rock.

The Sacramento Union, in a late article on this subject, notices a method of extracting gold from what is termed as the " tailings" of the quartz mills, invented by a Frenchman named J.

Scientists have developed a novel way to recycle toxic waste — extracting gold from old electronics using a byproduct of a staple cuisine in many cultures. Researchers at Switzerland's ETH ...