Parrien dealt Dakar a neck-cracking push that plunged him down through the darkened doorway and into the throat of an underground shaft.

By the 1860s the alluvial gold had been exhausted and efforts turned to underground shafts in search of gold bearing quartz reefs.

In the underground shafts of the former mines a feverish activity unfolded.

Even though nothing remains of the mining operations above ground, the collapse of the underground shafts and tunnels caused damage as recently as 1989.

Miles of underground shafts were driven in the course of working the quicksilver deposits in the area.

A security guard was coming towards them, bent like a miner in an underground shaft, pushing a metal cart.

Coal mining can often work through digging out underground shafts, but stripping off the land was cheaper.

Beneath him in the underground shaft another workman is digging the soil and shovelling it onto the platform.

It is mined in underground shafts and resembles shiny black obsidian.

Herculaneum suffered equally badly, except that there underground shafts and tunnels had to be driven to get at the antiquities.