Underground coal minig - global picture and brief overview
Underground mining currently accounts for a bigger share of world coal production than opencast • About 60% from the total production is from underground mines • In several major coal producing countries surface mining is more common. For example, surface mining accounts for around 80% of product...
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| 格式: | Documento de Conferencia |
| 语言: | spa |
| 出版: |
2021
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| 在线阅读: | http://repositorio.uptc.edu.co/handle/001/7789 |
