An autopsy is being conducted Thursday and police are investigating the death.
The Daily News reports the body was found Tuesday in a 20-foot concrete pit at the Beech Street foundry. It was reported by a man searching for scrap metal.
A deputy coroner estimated the woman had been dead more than a week. Capt. Robert Huhta called the death suspicious but said detectives were just beginning their investigation.
The foundry has been closed for years and was condemned a year ago. Police and neighbors said it has been a haven for metal thieves and drug users.