Military experts detonated a piece of military ordnance found at the Telus data centre construction site late Thursday night.
Workers evacuated the site on Bunker Road Thursday afternoon when the device when it was determined the device might be dangerous. The area was used at one time by the military for storage.
"Everything happened the way it was supposed to happen," Telus spokesman Shawn Hall said.
Crews were back at work Friday morning.
An explosive ordnance demolition team from the Department of National Defence in Victoria arrived in Kamloops at about 10:45 p.m., RCMP Staff Sgt. Grant Learned said.
The hardware is known as a power trained fuse device, and was left over from the Second World War, he said.
It was actually unearthed on Wednesday and set aside until the construction crew had a chance to hose it off and get a closer look on Thursday.
Lt. Michael St-Pierre, with Canadian Clearance Divers, described the device as a fuse that would have been used to set off an explosive.
He said that while he didn't want to minimize the danger, it was unlikely that the device would have hurt construction workers.
"If the excavator did hit it, it probably wouldn't even know."