Vancouver Island Mounties narrowed their search for a missing teenager Tuesday, focusing their efforts on a piece of property on the same street she was last seen four days ago.

Tyeshia Jones, 18, left her friend's home on Miller Road in Duncan to meet a boy at a grocery store around 2:30 a.m. on Saturday morning. She never arrived. Her cell phone was found at a local adult learning centre the next day by a caretaker.

Police have searched Jones' bank and phone records, but say they have found no activity since a text message was sent at 3 a.m.

Investigators concentrated their search Tuesday on a ravine property behind a home on Miller Road, the same block she was last seen in. The area was closed off by yellow police tape and forensic teams could be seen entering the area at mid-day.

Police told CTV News a member of the search team found an item that will be examined carefully by investigators, but would not say what it was.

"At this point until we determine what sort of investigation we have -- if its beyond a missing persons investigation -- we can't be specifically to what has been found there, which has caused the interest level to be increased," Cpl. Darren Lagan said.

More than 20 officers have been assigned to the case and are following up on any leads from the public.

Tyeshia's mother continues to hope her daughter will be found and says her disappearance is very out of character.

"I just want my daughter home. This is not like her. I don't know how many times I have to say she wouldn't hurt me like that," Faith Jim.

Jones is described as a 120-lb. First Nations woman with long black hair and braces. She was last seen wearing a black jacket, blue jeans and black boots.

Anyone with information on her whereabouts is asked to call the North Cowichan/Duncan RCMP at 250-748-5522 immediately.

With a report from CTV British Columbia's Brent Shearer