Just wait, the discounts decrease as AVZ move through the development, the major difference with African stocks compared to Aus/US/EU stocks is that, very little of the future gets priced in advance.
For example
Australian mine submits for mining permit in a historical mining friendly area - majority of the permit is booked in the SP before granting of the Permit Australian mine gets funding announcement - most of the price is booked in before the cash is in the bank Australian mine ships its first cargo - most of the NVP is booked in SP - in a hot sector will trade at a premium
African mine submits for mining permit in a historical mining friendly area - a blip until permit is approved African mine gets funding announcement - bump in SP but doesnt react fully until the cash is in the bank African mine ships its first cargo - SP will be close to NVP
When it comes to Dividends when the company matures the percentage will look better due to discounts.