extracting the ore of metals must soon be superseded by a more
economical system. To say that there are $100,000,000 worth of gold and
silver in the refuse piled up around the mines would be much beneath the
actual figures. The loss in iron and other metals, owing to the same
cause, is utterly incalculable. The recent discoveries in magnetism
point to the solution of the problem and the utilization of the waste.
It is not impossible that the electro-magnet contains more gold for its
fortunate inventors than all the mines of the earth will yield to
operators during a single year.