The states of uranium existing in coal ash are discussed based on the chemical reactions between the uranium oxides and minerals of coal during combustion.

本文根据铀氧化物与煤中其它无机矿物燃烧时发生的反应，讨论了煤灰中存在的铀化合物。

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Some regions of the world are well supplied with coal and minerals, and have a fertile soil and a favourable climate; other regions possess none of them.

世界上有些地区煤炭和矿产供应充足，土壤肥沃，气候宜人；而其他地区则不具备这些条件。

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Increased reserves were found for 57 minerals, including 1.34 billion tons of crude oil, 647.2 billion cubic meters of natural gas and 23.11 billion tons of coal.

有57种矿产新增查明资源储量，其中，石油13.4亿吨，天然气6472亿立方米，原煤231.1亿吨。

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Thamrin Sihite, director general of minerals and coal at the Indonesian energy ministry, said workers were in the underground training room when the roof collapsed, caving in most of the room.

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Oh, they would have opened up everything: the metal ores and minerals, the countless deposits of coal.

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The company is engaged in exploration for, and mining and sale of coal, copper and other minerals.

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