| 41. | The waves excite low-frequency vibrations in the slightly flexible shells of the plastic or metal mines.
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| 42. | Sumitomo Metal Mining fell 15 yen to 390.
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| 43. | The process, called froth flotation, is now used in every major metal mine in the world.
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| 44. | There are many gold, silver and base metal mines in the area including the Snip property.
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| 45. | They add that this could also put some salt, coal and metal mines out of business.
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| 46. | Subsequently, china clay extraction became more important and metal mining had virtually ended by the 1990s.
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| 47. | After some time he decided to move from metal mines to coal mines for his health.
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| 48. | Sumitomo Metal Mining Co . may sell 20 billion yen worth of bonds next week, underwriters said.
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| 49. | Trude is randomly extracted from metal mines.
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| 50. | The company says it is now relying on its base metal mining to keep its operation viable.
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