North Queensland Bulk Ports (NQBP) has released a draft report into the effects of dredging at Abbot Point, which involves dredging three million cubic metres over 184 hectares.
Conservationists have raised concerns that dumping the dredge spoil only eight kilometres from Holburn Island national Park in the Whitsundays region could harm marine life.
NQBP chief executive officer Brad Fish says the soils that will be dredged have been tested for dangerous chemicals.
Mr Fish says studies have given the dumping spot the all-clear.
"Part of the process we're required to go through for the approval is extensive testing of that material to make sure there's no contaminants in that soil, and that's been confirmed," he said.
"It's clean sand material that we'll be re-locating.
"We've done extensive 3D modelling and that modelling has all been peer reviewed as well, which is showing there's no impact on Holburn Island."