Share price plunges, impairments at Simberi and Atlantic mines
Newcrest, St Barbara need to consult New Ireland over 'purchase agreements'
'Holy grail' to become a top-tier producer
Garry commends deep sea work at Simberi
Quarter of workforce infected with Omicron
Guidance falls from 95,000oz at $1720-$1810/oz to between 80,000-95,000oz at up to $2030/oz