| 21. | Furthermore, those that do occur are generally heavy minerals or coarse grained micas ( both Muscovite and Biotite ).
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| 22. | Many early railways had been simply a means to move coal and other heavy minerals from a pit to a waterway.
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| 23. | They are formed by accumulation of such heavy minerals within beach systems, and are a type of " placer deposits ".
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| 24. | Dredge D2 was a complete unit comprising a bucket ladder dredge and heavy mineral separation plant mounted on a single pontoon.
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| 25. | Once the London, Midland and Scottish Railway reached Manchester the line carried expresses to London St Pancras and heavy mineral traffic.
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| 26. | It produces / sells six heavy minerals namely ilmenite, rutile, zircon, monazite, sillimanite, and garnet as well as various value added products.
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| 27. | Later in the 18th century, William Withering noticed a heavy mineral in the Cumberland lead mines, which are now known to contain barium.
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| 28. | Heavy mineral sands are placer deposits formed most usually in beach environments by concentration due to the specific gravity of the mineral grains.
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| 29. | For example; the medium-sized Coburn mineral sands deposit, Western Australia, is 230 million tonnes at 1.1 % heavy minerals, and is 13 km long.
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| 30. | Also in the 18th century, English mineralogist William Withering noted a heavy mineral in the lead mines of Cumberland, now known to be witherite.
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