Thoughts on Galena mine 4Q2013 production report -
Couple things jump out at me from this report. First, this particular report is incomplete since it does not quantify the number of tons and grade of development waste milled in 4Q2013...in 3Q2013 production report 7,676 tons of development waste was milled at a grade of 1.75 opt silver. Second, contribution of new long hole stopes on Caladay Vein lead halo is evident in lead production numbers doubling from 705,665lbs in 3Q2013 to 1,453,811lbs in 4Q2013. In early November on Scotia podcast Darren said there was still 200ft of development work necessary before ramping the first long hole stope bulk production at Galena mine so taking into account 10 day loss of production in December, this doubling of lead produciton from 3Q2013 to 4Q2013 was accomplished with potentially only 2-4 weeks of long hole stope production contribution during all of 4Q2013.
Stope muck head grade at Coeur and Galena mills increased from 12.83opt silver in 3Q2013 to 14.38opt silver in 4Q2013, a 12% increase in silver grade in just one quarter. 2013 was first full year of barrick boyz running galena mine and year over year comparables of stope silver grade increase are more profound, 4Q2012 grade was 10.70opt silver vs 4Q2013 at 14.38opt silver.
Under previous USA management, Galena mine mucked generally in the low 8 opt silver range. Part of increase in silver grade can be attributed to high grading mine, part of the increase in silver grade is a result of management putting specific processes in place at stope to keep miners from trying to hit production bonus by mixing waste rock with bonanza grade ore. Previous USA management solution for this dillution problem was simply to accept it and work around it by downgrading all Galena complex mineral reserve by 20% so that galena mine reserves better reflected the miners dillutive underground mining technique.
Stope output a 395tpd in 3Q2013 and 394tpd in 4Q2013. This suggests to me that at 395tpd, the bottom is in with respect to mill throughput tonnage under new high grade Galena mine plan.
Per 3Q2013 production report, the mills also processed an additional 83tpd of devlopment waste grading 1.75opt silver. Assuming underground development proceeded at a similar pace in 4Q2013 as it did in 3Q2013, potentially 6800+ tons of development waste were run through mills in 4Q2013. Grade on this 6800 tons of waste is a real wildcard since geometry of Caladay lead is very broad, in order to get to central area of bonaza grade 15opt silver, 15% lead, (development drifting must necessarily cut through lower grade areas, lots of 5-6opt silver and 6-7.5% lead out there)... by petersgray thanks good info -
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