Nibiru's atmosphere is made of fine gold particulate. When Nibiru collided with Tiamat, Earth and the asteroid belt were created. During the collision Nibiru a large part of its atmosphere was damaged. As newly formed Earth cooled and became a sphere again, the gold dust was trapped deep underground. There is a reason that the majority of the the gold is along the edge of Americas along the Pacific Ocean, Australia and South Africa - this side of the planet is where the collision occurred. Ever wonder why the Pacific Ocean is so vast and contains the so many tiny islands, fault lines and volcanoes? The Earth is still healing from that impact.

Nibiru's atmosphere has to be repaired for them to survive, every 3600 years its orbit is close enough to Earth to launch recovery missions and mine as much gold as they can. The Anunaki will only negotiate with those who have the gold. The powers that be on Earth will surely try to trade gold for technological advances.