The standard method of reporting is oz (or g) of gold equivalent per ton. Add the total value of gold and silver, and figure out how much gold that is equivalent to. At 1240 gold and 18.60 silver, each oz silver adds about 18.6/1240 = .015 oz Au eq. With about 15 oz Ag per oz Au in the War Eagle area, that means the silver adds about 15 x .015 = .225 oz Au eq for each oz of actual gold. So if the ore is 1.225 oz Au eq, then 1 oz is Au, and .225 oz is Ag. To put it another way, the gold accounts for 1/(1 + .225) = .82 or 82% of the reported value. All numbers subject to correction when actual values are reported, of course!