Teams comprised of police, military, and the local disaster agency deployed heavy machinery to help the search in the village of Buranga after the landslide on Wednesday evening.
At least 15 survivors had been found as of Thursday.
Fatmawati, a spokeswoman from the search and rescue agency in the provincial capital Palu, who goes by one name, said at least one person was missing.
Disaster officials said intense rainfall and unstable soil structure at the illegal mining site may have contributed to the landslide.
- [NON-ENGLISH SPEECH]
- Last night, we found two spots where we confirmed there were victims that could not yet be taken out because their bodies were blocked by mud. So we waited until the water had dissipated. And then we followed up.