Mining. Mining the ore usually required mine shafts sunk to mine quartz from the reefs, sometimes deep underground. Horizontal tunnels called drifts were dug out from the shaft at different levels to find the gold-bearing rock.
Quartz. Quartz is one of the most common minerals in the Earth's crust. As a mineral name, quartz refers to a specific chemical compound (silicon dioxide, or silica, SiO 2), having a specific crystalline form (hexagonal).
Crystal Mine is located near Juneau in the U.S. state of Alaska.The quartz ledge at the Crystal Mine was first discovered in 1895 by B. Heins. It was so named because of the large pyrite cubes which were found occurring in the surface outcrops of the ledge.
An EPFL engineer has discovered a way to extract value from mining waste by recycling the quartz it contains to make composite surfaces for kitchen and bathroom countertops. Brazil-based Vale, the world's largest producer of iron ore, will try out his idea. Synthetic quartz surfaces are an ...
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