9% Discounted Net Present Value of open pit is $430 m USDFrom the HKEX document..
As the plan of the mine, our Songjiagou Open-Pit Mine will have a LoM of about nine years at a normal production capacity of approximately 3.3 Mtpa ore.
Based on the SRK Report and projection by using discount cash flow modelling, our Songjiagou Open-Pit Mine has a net present value of approximately RMB3,064 million at a discount rate of 9%. ( $430 Million US )
Therefore, it is technically feasible and economically viable.
Also , note that the current processing rate is about 1.6 million tons per year while the normal production capacity ...as stated in the HK docs..is 3.3 Mtpa.
So, it looks like the expansion of the current open pit both horizontally and at depth via HK IPO should double the current productiin of 40,000 ounces to 80,000 ounces.
It might be a bit more as grades are also stated to increase.