# Opal Mining Town in Australia #

> If we used mirrors of 10 m^2 area, that would take 100 such mirrors. >Would 135 kw/m^2 melt rock? That I do not know. I had just remembered O'Neill saying that a concentrating mirror 1 football field in area could be used for smelting and metal working. But we don't just want to melt the rock, we want to actually vaporize it in order to remove it. So that's why I said several football fields. Regards,
Mike Combs