Since then, three additional former students and several new witnesses have come forward, leading to the latest charges.
The man first appeared at Christchurch District Court earlier this month and is due back in court next week.
Simmons said police are continuing to speak with those who were at the school during the time the alleged offender worked there.
“The investigation is ongoing and police are speaking to people that have come forward since our appeal in October,” Simmons said.
“Investigators have identified new complainants, allowing for additional charges to be filed.
“Police will determine whether more charges will follow as the investigation continues.”
Simmons urged victims of abuse at the school to come forward.
“We understand how distressing it can be to report or talk about offending of this nature, but we have officers and detectives dedicated to these cases and to providing a safe space to report offending in confidence,” she said.
“We want to thank those survivors who have spoken to us already and will continue our work to pursue justice for them.”
Anyone with information for police can contact Detective Senior Sergeant Karen Simmons at Christchurch Central Police Station or by reporting it online here, referencing the file number 230122/3143.
