Johannesburg - Mafikeng High School has expelled a teacher accused of having a sexual relationship with a 16-year-old school boy, the school's governing body (SGB) said on Friday.

"The governing body... resolved to concur with the recommendation of the disciplinary panel that the 37-year-old female educator be summarily dismissed," said chairman Lesiba Moses  Kgwele.

He said the teacher, who was married, was charged with involvement in an improper relationship with a pupil, and failed to  disclose the progression of the relationship from a professional to  a deeper personal level to the principal and/or parents of the pupil.

The teacher was called for a disciplinary hearing on Tuesday, but submitted a resignation letter dated December 10, five days after she had received a notice to appear at a disciplinary hearing.

"The SGB rejected her resignation letter that she had submitted to the school management," he said.

"In our view, the resignation letter was an attempt to avoid disciplinary action, as it ignored the one-month notice period that  educators employed by the SGB have to serve in terms of their employment contract."

Kgwele said the SGB held a strong view that any reasonable person would have welcomed the opportunity to clear their name instead of resigning after a disciplinary process had been initiated.

He said the mother of the boy lodged a complaint on October 20, after she found disturbing information on her son's cellphone.

"We had agreed with the parent to hold back disciplinary proceedings so that they did not affect the learner’s performance in the exams and marking of exam scripts by the said educator."

Kgwele said the audio-visual material that the parent discovered  on the cellphone of the pupil was sufficient for them to arrive at the verdict of guilty and to dismiss the teacher.

"We are confident that, together with the parent, we have acted in the best interest of the learner, as he has managed to pass Grade 10 and will be proceeding to Grade 11 next year."

Kgwele appealed to parents to take an interest in what was stored on their children’s cellphones and with whom they were chatting on social network platforms such as facebook and Mxit.

North West police said the teacher was arrested and charged under the Sexual Act.

"She appeared in the Mmabatho Magistrate's Court on Friday," said Lt.Col Lesego Metsi.

He said the female teacher was alleged to have been involved in a sexual relationship with a 16-year-old Grade 10 boy for over a period of a year.

She was released on R700 bail and her case was postponed to March  5.