At its height, about 100 firefighters from 16 crews across Nottinghamshire and Derbyshire were in attendance at Savanna Rags, off Nottingham Road.
Nearby homes were evacuated and power shut off as crews battled the inferno.
Nottinghamshire Fire & Rescue Service said more than 30 firefighters remained on scene this morning.
And crews from Ashfield Fire Station in Kirkby, who were in attendance, have shared dramatic images from the blaze.
5. Inferno
At its height, about 100 firefighters were in attendance. Photo: Nottinghamshire Fire & Rescue Service
6. Damage
Much of the building has been destroyed. Photo: Nottinghamshire Fire & Rescue Service
7. Night vision
The fire at Savanna Rags in Mansfield has been burning through the night. Photo: Nottinghamshire Fire & Rescue Service
8. Emergency services
Ambulance staff and police were in attendance alongside firefighters. Photo: Nottinghamshire Fire & Rescue Service