Recent posts under tag mines

+1 vote

1 answer

The Artigas Mines in Uruguay are known for the high quality of what semi-precious stone?

posted Feb 3 by Anil Chaurasiya

• uruguay
• mines

+1 vote

1 answer

What miners' oil lamp, invented in 1815, had a wire cylinder to enclose the flame, preventing the explosion of coal-gas?

posted May 11, 2020 by Rajni

• invention
• history
• mines