Both were about 10 tons to one ounce , congress has to give up 50% to mine owner in royalties but there is less labor because the ore is partialy ground up and in nice neat piles ready to be processed.Keystone has to be paid 20% in royalties be it is labor intensive .Congress has up to 1.2 million in tailings ready, 120,000 ounces of gold$140,000,000.00 which mngg will get 70 million of.Keystone has 850,000 tons ready to be processed which 85,000 ounces of gold = about $105,000,000.00 which mngg will get 90 million of.Of course you you have a lt ofexpences but mngg will get about $150,000,000.00 between both mines after royolties.Keystone has a lot more upside when it is expanded to 80 acres and also you have to add ghana.Buy the time all that gold is harvested the OS will be about 1 billion