Mineral coal, copper, silver, coal reserves are more abundant.

矿产有煤 、 铜 、 银等, 煤炭储量较为丰富.

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Applied in the laboratory testing process of mineral coal preparation overflow classification, concentration, de - mud, dehydration.

适用于试验室选矿选煤试验过程中溢流分级 、 浓缩 、 脱泥 、 脱水.

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Plant charcoal and mineral coal were the two classes of fuel used in Ming Dynasty Beijing.

明代北京使用的燃料,有植物性的柴炭和矿物性的煤两类.

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