Unfortunately, that's where I lose my way a bit. How do you value a company that isn't making a profit now, but is in its growth phase.
Others will have more intelligent things to say on this than I can.
But for what it's worth, here goes:
2017 Au operations only @ $0.70 = a PE of around 35
2019 Au and US operations @ $1.23 = a PE of around 33.