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I was wondering how much was true, I never heard any of that, but it is in Bradley's book, too.

It was enormously expensive. The Treasury actually lent out all it's silver to The Manhattan Project.

Well, yes and no.

The Treasury silver was used in the Manhattan project, but not for its money value.

Silver and gold are the absolute best electrical conductors in the world (copper is much worse compared to those two) and when the Manhattan Project had to make extremely high-powered, high-current, extremely small electromagnets, only silver could be used in the wires. Copper wires would simply have heated up too much.

SO the Treasury "moved" the silver from the mints into the magnets. It was still US money, just not the same shape, and in a slightly different "vault" under different "guards"....