Spontaneous combustion caused the massive blaze at recycling plant Mid UK on Barkston Heath, Lincolnshire Fire and Rescue has confirmed.
The fire began on July 7, quickly spreading to 4,000 bales of household waste and carpet. The remains continue to smoulder, with Mid UK workers adding soil over the last few days in an attempt to remove oxygen and suffocate the flames.
The firm’s fire marshals remain on the site but firefighters have scaled back operations and fire officers continue to visit to monitor the situation.
At its height, 12 fire engines and two water carriers were at the scene.