Two other charges were partially made out and another two were dismissed by Stipendiary Magistrate Charles Pitto on Tuesday December 9.
During a sentencing hearing at the Magistrates' Court yesterday, Mr Pitto
imposed fines of £40,000 each on three of the charges.
imposed no separate penalty on the rest of the charges.
had earlier delivered a damning verdict against Nature saying that their efforts to comply with the regulations had "ultimately lacked focus".
The judge also dismissed the suggestion that Nature had been unaware that the two Spanish workers were carrying out welding on the day of the explosion.
said: "Nature did know the works were taking place, they were carried out in daylight, in their plant."
Upon the conclusion of proceedings yesterday both Crown counsel Mark Zammitt and Mr Pitto expressed their condolences to Sr Zambrano's family and thanked Factories Inspector John Moreno who is set to retire.