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feor1300 t1_jd5tydc wrote

Reply to comment by slower-is-faster in TIL A coal seam in Australia is believed to have been burning for 6,000 years, making it the oldest coal fire. The site's name is Mount Wingen but is commonly called Burning Mountain and the fire is traveling south 1m per year discoloring the ground as it goes. by jamescookenotthatone

We probably could but the practicality of it would depend on how deep and wide the vein is. If it's 100m deep and 50m wide it's probably too expensive to dig a suitable trench out to completely cut off the vein. Also, it wouldn't stop the fire, it would just prevent it from spreading any further.

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