At present the r&d investment is only that of about 2 percent for the 204 listed enterprises in our country machinery industry. But according to the fact that In America the R&D fees reach 6 percent for the 245 listed mechanical enterprises, the research and development investment of China machinery industry is insufficient.
Looking from the American development experience, if an enterprise increases its r&d investment dramatically, its business performance and the profit level will improve greatly in the next 5 to 10 years, and excess returns of these listed companies is also much higher than that companies with less investment.
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Metal ores are normally divided into four types:
Ores are divided into four types according to their metal types:
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Metal ores are normally divided into four types:
- natural metal ores, such as gold, silver, copper and platinum and so on. Those metals exist in the metal ores as single elements. In nature, except the above four types of ores, there are few natural metal ores that holds the grade for industrial mining.
- Oxidized ores, such as haematitie, magnetite, pyrolusite, zigueline, zincite, cerusite whose elements are oxide, carbonate and sulphate.
- Sulfide ores, such as chalcopyrite, gelenite, sphalerite, molybdenite whose elements are sulfide.
- Mixed ores. They are created by mixing the above two or more ores.
Ores are divided into four types according to their metal types:
- Ferrous metal, such as iron, manganese, chromium and so on. The granule of those metals are black.
- Non-ferrous metal ores, such as copper, zinc, lead, tin, tungsten whose granules are non-ferrous.
- Precious metal ores, such as gold, silver and platinum which has good stability and high price.
- Rare metal ores, such as niobium, tantalum and beryllium which are rare in nature so that they are very expensive.
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