They were up against some tough competition with the June 25 to 28 event the biggest in its history.

Twenty-two countries competed with athletes vying for qualification into this year's world championships and the 2020 Olympics.

Amelia Mazzei and Stuart Geddes lined up in the green and gold for the Australian team while Emma Kennedy, Gracie Martin, Finn O'Keefe, William Vince-Moin, Immy Dellow, Mikielee Snow, Trent Low and Jay Stone represented Regional Australia.

Geddes' medal hope was cut agonisingly short with a serious fall in his 3000 metre under 20 steeplechase event.

He took a tumble 700 metres in and fell face first into a water jump steeple.

Geddes suffered a severe facial injury which required 10 stitches.

Mazzei finished with silver medals in her 400m and 200m races and earned her best ever times.

Her 400m effort was only second to Paralympian Torita Blake.

Dellow, Stone and O'Keefe were part of the mixed open 4x400m relay team who won silver. Dellow also secured silver in the under-18 4x100m relay as well.

Glen Innes-based duo Gracie Martin and Mikielee Snow were part of the bronze medal-winning under-20 4x100m team. Martin also managed to snag bronze in the under-20 400m individual event. Kennedy, Low and Vince-Moin were unlucky in missing out on medals.

All three of them part of relay teams who finished in fourth.