Te Paparahi o Te Raki is a two stage Waitangi Tribunal inquiry covering Northland lands.
Stage one of the inquiry, which began in May 2010 and concluded with closing submissions in February 2011, resulted in a report in 2014 which found Ngapuhi never ceded their sovereignty when they signed the Treaty of Waitangi.
Stage two of the inquiry, which began in March 2013, has involved weeks of hearings inquiring into the around 420 Treaty claims brought by hapu from Ngapuhi, Ngati Wai, Ngati Hine, Patuharakeke, Ngati Rehua, Ngati Whatua and Ngati Manuhiri.
Mr Kira said the hearings were about what happened since 1840 and they were important to ensure history was detailed factually.
He said during the hearings a number of issues had been raised including economic and social deprivation; the loss of resources and land; and the effects earlier settlers and missionaries had on hapu.
"In some circumstances the whole arena has been emotional. Because what you're doing is detailing information that hasn't been privy to people before. So a lot of emotions are attached to these historical sequences, and rightfully so."
The final hearing week in September will see the Crown present its closing submissions.
Once the Tribunal has completed its hearings for stage two, the process of writing the report, which will include recommendations, will begin. It is unknown how long this process could take.
"What we hope to then proceed is a deep report from the Waitangi Tribunal because that will scale what the effect has been on whanau and hapu," Mr Kira said.
The hearing will run from July 31 to August 4 with a powhiri scheduled for Sunday.