Apr 25, 2017· The modern hard rock method of mining gold produces most of the world's gold today. It uses heavy machinery to dig down to veins of gold encased in rock beneath the Earth's surface. The deepest gold mine in North America is located in Quebec, Canada.
The Romans were renowned for their innovations in mining engineering. The copper mines in Rio Tinto in Spain – the bestknown ancient mining complex in the world – are a striking example of this. While surface mining was the most common approach, the Romans also used .