ZION, Ill. (CBS) — Students in the Zion-Benton Township High School District will be out of school for another day Monday.

Contract talks between the teachers and staff union and the district broke down early Saturday morning.

LISTEN: WBBM Newsradio’s Brandis Friedman reports

Corinne McGue, president of the Zion Council of the Lake County Federation of Teachers, says several hundred teachers will return to the picket line Monday.

An attorney for the district, Anthony Ficarelli, says talks were going well (as did McGue) until the union presented a proposal on health insurance that the district could not afford to finance.

Ficarelli says after 36 hours of federal mediation, the two sides needed a reprieve. So far, no new times are set for another meeting.

Negotiations began back in April, the contract expired in July, and teachers have been working without one since.