Ngai Tamarawaho spokesperson Peri Kohu said Robbins Park had been occupied by various groups of people for hundreds of years so the find was no surprise.
"It's not unusual. Anytime you dig in Tauranga you're at risk of doing that. That's a high profile place," he said. "We treat [koiwi] with the highest respect."
History recorded some periods where the area was used as a burial ground which was confirmed by the latest discovery and there was also evidence of a midden, an old dump for domestic waste, in the area where the bone fragments were found, he said.
Once work was complete the koiwi would be returned to the same spot, blessed and marked with a GPS so they would not be disturbed again, Mr Kohu said.
Northpower contractors have been stood down while the site is checked for any last remains.
Tauranga City Council contractors working on repairing the badly damaged berms in Brown and Monmouth streets also unearthed archaeological finds earlier this month. They uncovered pottery, glass, metal, a military button, clay pipes and shells and identified postholes, ditches and small pits. The artefacts were likely to date from the early occupation of Tauranga and, in particular, the military occupation from 1864.