RE:actual return on investment Do you mean for extraction of lithium from clay? That's a far way off. Many many pieces are needed to fit together.
1. Create a 43-101 for Li in Clyton. More drilling needed for that.
2. Apply for permits to extract Li from clay. And use an unproven chemical process to do so. Or develop an alternate technology.
3. Compete with other Li producers. Only viable once the price increases.