Asteroid 2011 UW-158, is claimed to have platinum and other precious metals and materials worth any where from $300 billion to $5.4 trillion, Slooh, a community observatory website, which also showed the passage of the asteroid live said.
"The size, composition, and orbit of 2011 UW158 have gained it a place on the short list of asteroids that might make a good target for robotic mining missions in the near future," Slooh said.
Nasa has also said that "It is not presently cost effective to mine these minerals and then bring them back to Earth. However, these raw materials could be used in developing the space structures and in generating the rocket fuel that will be required to explore and colonize our solar system in the twenty-first century."
Source: Daily Sabah