They were also extensively used in hydraulic mining and working placer deposits for gold, tin and other heavy minerals.
22.
Once the London, Midland and Scottish Railway reached Manchester the line carried expresses to London St Pancras and heavy mineral traffic.
23.
Many early railways had been simply a means to move coal and other heavy minerals from a pit to a waterway.
24.
They are formed by accumulation of such heavy minerals within beach systems, and are a type of " placer deposits ".
25.
Dredge D2 was a complete unit comprising a bucket ladder dredge and heavy mineral separation plant mounted on a single pontoon.
26.
It produces / sells six heavy minerals namely ilmenite, rutile, zircon, monazite, sillimanite, and garnet as well as various value added products.
27.
Heavy mineral sands are placer deposits formed most usually in beach environments by concentration due to the specific gravity of the mineral grains.
28.
Later in the 18th century, William Withering noticed a heavy mineral in the Cumberland lead mines, which are now known to contain barium.
29.
Also in the 18th century, English mineralogist William Withering noted a heavy mineral in the lead mines of Cumberland, now known to be witherite.
30.
They can also contain the following particles at less than 63 micrometres : calcite, dolomite, siderite, pyrite, marcasite, heavy minerals, and even organic carbon.
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