In past years, the state has also produced mercury, silver, and copper.

However, the company by this point was not even able to produce enough copper for its internal uses.

By the 19th century, the mine employed over 250 people, producing not only tin, but copper, lead, and some silver.

"At this moment, we are producing copper at a cost rate greater than its selling price," he said.

It is said to have produced copper, iron and orpiment.

We're working full time on the copper plant, but it'll be a day or so yet before we can produce virgin copper.

In the early twentieth century the mine produced gold and copper.

The mine produced copper and cobalt between 1902 and 1968.

It is also an open pit mine and produces copper.

The mines did not even produce enough copper to supply the company's internal demand.