An investigation is underway after a person dies after what officials are calling an underground incident at the Young Mine in Jefferson County.

The Jefferson County Sheriff’s Office says Nyrstar reported the incident early Saturday morning at its Young Mine off West Highway 11E in New Market.

Response teams say one employee was unaccounted for but all the other employees were safely evacuated from the mine.

Yesterday, (Sunday) Nyrstar said that the unaccounted employee had died from injuries sustained in the incident.

Nyrstar operates three underground zinc mines in East Tennessee in Knox and Jefferson counties and ore from the three mines is processed into zinc concentrate at the Young mine site.