The economic study considered a base case mining rate of 20,000 tonnes per day mining 247 million tonnes of leach material
over a life of mine of 36 years averaging 25.3 g/t silver and 5.92 g/t indium, using the three year trailing average silver price of USD13.30/oz and USD530 per kg for indium.
was considering the feasibility of recovering gold from the lower grade, heap leach material
, which contained an estimated 64,000 oz of gold.
In the Leach material
there is no evidence that R.T.C.
At present the grade of the dump leach material
is too low to justify crushing and heap leaching, but it does contain enough copper to warrant stockpiling as dump leach ore.
One third of this arc is dedicated for mill feed and the remainder is used for heap leach material
. The crusher operator locates the stacker over the appropriate area when operating.