If the planet Nibiru does exhist and does make a return it will pass through the astroid belt (acording to Sitchin) on its closest passeage to the sun. The astriod belt is 2.8 Au's out from the sun and would be roughly 180 million miles from earth.
Sitchin claims that the Anunnaki arived on Earth some 450,000 years ago to extract gold from the sea which the Anunnaki needed to repair there atmosphere. This method proved to be inafitiant so gold mining was astablished in Africa some 45,000 years later.
300,000 years ago came the revolt of the Anunnaki tierd of toiling in the mines and so Enki and Ninti created the first humans the adapa/ adam.
Yet in the 450,000 years of sumerian history/ mythology there has only been 1 recorded desaster due to the passing of Nibiru. This happend about 13,000 years ago and was also due to the Earth warming combined with the gravatational force from Nibiru causeing the ice caps to slip into the see thus causing the the great flood. It was Enki who warned Utnapishtim (biblical Noah) fo the pending doom and saved humans.