You are right, market cap of ADY is much higher. Because they are an iron ore PRODUCER, selling heaps of stuff to China. BTW, I think ADY how to handle authorities and to set up a mine. In their current presentation they estimate an annual revenue of 125m$ (lithium and potash), additional to iron ore of course.
I would be surprised if we see any sexy numbers out of GXY´s lithium project. Just my opinion.