CCTV reported that 19 miners and seven others were killed in the landslide Friday in Wulong county. Rescuers saved seven people, three of whom were seriously injured but in stable condition.
Fifty-two people were missing, including 27 workers buried in the mine, said an official with the propaganda office of Wulong, who would only give her surname, Zhu.
The missing also included 21 farmers, three passers-by and a teacher, CCTV said.
More than 500 rescuers were searching for survivors, the official Xinhua News Agency said.
Rescuers were also digging a channel to relieve a barrier lake that formed when the landslide blocked a river, CCTV said.
Densely populated Chongqing is rich in iron ore, natural gas and other mineral resources, and industrial accidents are common.
An official with the Chongqing work safety supervision bureau, who would give only his surname Dong because he was not authorized to speak to media, said the landslide did not appear to be related to mining activities.
Similar landslides have been reported around China, including one last year where at least 277 people were killed when a shoddy holding reservoir burst and a three-story wave of mud and iron-mining waste inundated a valley in Shanxi province in northern China.