Quartz reef mining - WikipediaQuartz reef mining played an important role in 19th Century gold-mining districts such as . the reefs, sometimes deep underground. Horizontal tunnels called drifts were dug out from the shaft at different levels to find the gold-bearing rock.to mine horizontal gold reefs,The top ten deepest mines in the world - Mining TechnologySep 11, 2013 . The mine exploits the gold contained reefs at a depth of more than 3.7km. . comprises of twin vertical and twin sub-vertical shaft systems.
to mine horizontal gold reefs