I am very bullish on TC, but I have to rein in your enthusiasm... sorry. 60,000 tons per day is of RAW material processed. That 60K of raw material yields ___ tons of concentrate. That concentrate has the 31g of gold plus the copper you cited. That ___ is the missing variable to be able to get the value of TC and is what everyone is waiting on the next few quarters to be able to fill out. The reasonable guess is that cash flow is going to be about $1 per share out of MM, so debt will be paid off but not as quickly as you stated above.
I think you are a little off in your AU content per Tonne It is .39 grams per tonne
The Mt. Milligan copper-gold porphyry deposits contain Proven and Probable reserves of
482 million tonnes (Mt) averaging 0.20% Cu and 0.39 grams per tonne (g/t) Au totalling
2.1 billion pounds (lb) copper and 6.0 million ounces (oz) gold. The near-surface and
tabular configuration of the reserves make them well-suited to low unit cost open pit
development with a life-of-mine (LOM) waste/ore ratio of 0.84/1.