Santos has previously said he respects “the cultural heritage of the Tiwi people”, while insisting there are no significant risks associated with the 260 kilometers (160 mi) pipeline.
The pipeline passes close to the Tiwi Islands, a sparsely populated archipelago about 80 kilometers (50 mi) off the coast of Darwin in northern Australia.
About 90 percent of the population of 2,000 on the islands are Indigenous Australians, known for their distinctive art, language and love of Australian rules football.
The A$5 billion (US$3.2 billion) Barossa gas project is being delayed as opponents raise concerns about its impact on climate change, ecological footprint and areas of cultural significance.