COVID-19 related deaths remain at 3.
The update was released by the National Pandemic Controller David Manning.
All of these new cases are from Ok Tedi Mining Limited and are all asymptomatic, meaning they had not shown symptoms of the disease at the time of testing.
It was reported that the 12 cases are from eight dongas that had had initial cases.
The new cases are being isolated with other positive cases.
Total confirmed cases of COVID-19 in Western Province is at 97.