Mr Brown said the 17-year-old was to attend Victoria University next year to study commerce.
"There was a powhiri and a very powerful haka that was led by the prefects. It was a very emotional time."
He said a number of fellow students were also orchard workmates with Ira.
The school's Year 13 dean, Anne Millward-Brown, said Ira's sister received the award on his behalf.
"It was a very emotional time. To lose a boy is just awful."
She described Ira as a "very bright, hard worker" who was well liked by all students and staff members.
Ira's sister, Ruby Gannaway posted a tribute to her brother online and said: "I can't even believe it. You never imagine this stuff happening to your own baby brother ... words can't even describe what it feels like to lose a brother. I love you so much Ira Gannaway you are the best little brother in the world and we are hurting so much. I just hope you can see how loved you are."
Hannah Shennan said: "I am so sorry for your loss Ruby. I know how much your brother meant to you and you will always have the many amazing memories that you shared with him. Stay strong beautiful and know that I am always going to be here for you. Love you so much Ruby."
Tahlia Irvine said: "I am so so sorry Ruby words can't describe what you must be feeling and I can't even imagine your pain. Remember all the amazing memories you have with him and stay strong."
Ruby later said: "Thank you everyone we are overwhelmed by everyone's love and support, I am still in shock and can hardly believe my baby brother has been taken."
Police and the Ministry of Business Innovation and Employment are conducting an investigation into the workplace accident.