Need some help with revenue calculationsWhere did you get your "...the reported 13,078,864 / 6,337,737 / 224,021 numbers" from?
Anyway, keep in mind that the "payable production" figures relates to the metals produced during the quarter - not what was shipped. The news release numbers are produced, not sold.
Secondly, smelters don't pay for 100% of the metal in the concentrate, as some of it is lost in refining. You can get anywhere from 85 or 95%, but it depends on the customer, and there are all sorts of penalties, and treatment & refining charges that are netted against the revenue numbers. Those last tid-bits are disclosed.
Using the payable metal SOLD numbers from the MD&A for Q1-2015 of
Zinc 11,793,052 lbs at $.93
Lead 7,271,847 lbs at $.81
Silver 244,333 oz at $16.43
Do the math and then multiply by 1.2412 - the ave CDN-USD exchange for the quarter and you will arrive at a number that is very close to the $25. million.