I worked in a copper mine for nearly three years, 18 hours a day, seven days a week.
I've found a copper mine in a mountain close by here.
He had heard they needed men on the new copper mines.
In the 1970s, a copper mine was established near the site and ran until 1996.
It already has a copper mine down there, but it's running low.
About suffering men who worked for weeks on end at a copper mine.
There was also an 18th-century copper mine and works near the village.
A large copper mine was begun in the 16th century here.
The copper mine that was the foundation of the town, has since closed.
The copper mine at one end of the town is another attraction.
Wörterbuch für Geologie