Shepard, Mordin would like a talk with you in the Tech Lab. He may be able to reduce the resources necessary for building a Reaper.
With the current schematics, it will cost 950000 Platinum and Palladium, along with 500000 Element Zero and Iridium, to assemble a single Reaper. We will require around five hundred Reapers in order to mount a viable defense force.
It is too dangerous for the Citadel or Geth Fleet to mine minerals in the dangerous areas of the galaxy, so you will have to do most of the material gathering yourself.
Shepard, the specialized Normandy probe is now ready for deployment. Go to the CIC and direct the ship on the galaxy map to begin mining the Element Zero out of each disabled Reaper.
Or a Pre-CSS Counterstrike match on de_dust, no AWP's.