The bottoms was another band of bright soft coal called "bottom softs".
A high-grade soft coal was mined in the surrounding region.
Bituminous, the most common, is a soft coal used by electric companies and steelmakers.
Lignite, the softest coal, accounts for a tenth of domestic production.
The nearby mines provided 60 percent of the country's soft coal, and power plants here generated half the country's electric energy.
How are things going to be kept 'bright and clean' with soft coal and our kind of city government?
Lignite deposits (soft brown coal) can contain significant uranium mineralization.
In this summer season the pits never turned full time, particularly the soft coal.
A piece of soft coal altered the lines in the face and the appearance of the eyes.
Aerosols come from both natural sources (like volcanoes) and human activity (such as the burning of soft coal).
