| 31. | They were made redundant with the introduction of explosives, although hydraulic mining is still used on alluvial tin ores.
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| 32. | Tin Creek and Cassiterite Creek, about south of Brooks Mountain, have tin ore deposits in tourmaline and garnet rocks.
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| 33. | Other forms of tin ores are less abundant sulfides such as stannite that require a more involved smelting process.
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| 34. | The tin ore was heated and the tin flowed into cast iron crucibles where it was re-heated to remove impurities.
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| 35. | The production figures for copper 1845 1864 and for tin ore, 1855 1864, are given in " Cornish Mines ".
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| 36. | In 1987 cassiterite ( tin ore ) crystals in a stream in the Taurus foothills were found by the MTA geologists.
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| 37. | There is no natural copper or tin ore in Norfolk so all raw materials must have been imported, probably by trading.
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| 38. | During the following two decades, Hochschild built up an economic empire in Bolivia around the mining and trade of tin ore.
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| 39. | Early modern'crazing mills'powered by water, such as that which existed at Penventon, were built to grind, and later stamp the tin ore.
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| 40. | Tin ore was plentiful in Lukut, an area within the Port Dickson district, during the 1820s, and it attracted Chinese immigrant miners.
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