Share price vs mine lifecycle

I like MCR as a big nickel producer with exposure to upcoming demand from electric vehicles. It could give a return on investment with minor risk, in my opinion. I also like having smaller nickel explorers in my portfolio for similar exposure but also because there is potentially much larger upside to their share given where they are in the mine lifecycle. This graph shows an example regarding the lifecycle without overlaying the forecast boom in nickel price, though DYOR. I’m wondering about what proportion to split my investment across the two - what are other investors doing, 70/30, 50/50, ??