An example of an economic gold-copper porphyry system:
"The Bingham Canyon Mine is an open-pit mine exploiting a large copper porphyry, southwest of Salt Lake City in the USA. Bingham Canyon has been in production since 1906 and is now two and half miles wide and three quarters of a mile deep, covering 1,900 acres. By 2004, the mine had produced more than 15 million tonnes of copper, 23 million ounces of gold, 190 million ounces of silver, and 850 million pounds of molybdenum. The Bingham Mine operates from reserves grading at 0.54% copper, 0.043% molybdenum, 0.32 grams per tonne gold and 2.59 grams per tonne silver."
This might not be the best comparable for FNT but it shows what you can do with a 0.32g/tonne grading.
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