I see what you did, (30% Cu increase so ~30% market cap increase) but that's not correct.
Every additional penny they get for Cu goes straight to the bottom line. Per the FS its ~$153M per 10% of base Cu price or $0.275.
In other words after tax 7.5% NPV is more like $1.2B at todays Cu. I don't know that you want to assume $3.63/lb is a LOM price, but the outlook is sure looking good.