The raid was led by the indefatiguable Director of Kathu District, Veera Kerdsirimongkol, who acted on reports that illegal quarrying had been taking place in a protected area above 80 metres.
He and his team of 15 found a large amount of earth had been removed at the site.
A foreman, Sompong Janton, told the raiders that he had a year-long contract with the Kamala hilltop owners to remove the soil.
The contract ends on March 19 next year.
Khun Veera had been diligently arresting workers and halting suspected illegal operations throughout Kathu, one of Phuket's three districts.