| Controversial excavation method |
The Washington Post |
10 Apr 2019 |
| Controversial excavation method |
LA Times Daily |
10 Apr 2019 |
| *Coal extraction technique |
Universal |
09 Mar 2019 |
| Controversial excavation method |
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| *Coal extraction technique |
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| Controversial coal-extraction method |
LA Times Daily |
23 Oct 2018 |
| Controversial coal-extraction method |
The Washington Post |
23 Oct 2018 |
| Controversial coal-extraction method |
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| Controversial coal-extraction process |
LA Times Daily |
21 Apr 2015 |
| Controversial coal-extraction process |
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| Controversial excavation method |
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| Cause of erosion, maybe |
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| Controversial groundwork? |
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