Well from the Independent Experts Report late 2014 ... Mt boppy has a life of 2.7yrs
Manuka some 60 Moz of silver mineral resources and 9 Moz of silver reserves or @ 200koz per month = 3.75yrs
But of course infill drilling will be done at Manuka to turn more of resources into reserves 60moz is a good size resource to have and is considered to be one of the largest pure silver projects in Australia
I'm confident that we will see mine life out to 10yrs without to much expenditure at manuka
Trainstone wouldn't be loaning the large upto 60mill in funds if they didn't believe in BOK to become a very successive PM producer
BOK major upside is in the AUD Silver price we see the AUD fall to 70c vs USD etc and some strength come back into Silver the margins over AISC could over $10 per oz so 20-24mill AUD EBIT p.a + Gold
then if your real bullish like I am in Silver and think it could well be double than BOK will have a $ SP