Rick Tomlinson, DSI chairman, said: "This is a very interesting and amazing time ... we believe we sit in a sea of resources that is so infinite it is almost impossible to describe."
The company believes materials harvested from asteroids can be used to build complex metal parts for use in space infrastructure and to fuel and equip spacecraft, bringing down the cost of missions to Mars.
From 2015 a fleet of "FireFly" spacecraft, weighing just 55lb each, will whizz into space to explore any passing asteroids for signs of useful materials such as industrial metals, platinum-like metals, water and silicon.
Within a decade Deep Space Industries, the company behind the project, hopes to be able to harvest passing asteroids for metals and other building materials for use in space projects such as building communications platforms and solar power arrays.
http://www.telegraph.co.uk/science/space/9818734/Worlds-first-fleet-of-asteroid-prospecting-spacecraft-launched.html
3D maps of 500,000 asteroids with estimated value:
http://www.asterank.com/3d/