Using your number of 30,240 yards for December, one gets the following:
@ .4 grams/yard, 376.23 ounces $526,718.72
@ .3grams/yard, 282.17 ounces $395,039.04
@ .2grams/yard, 188.11 ounces $263,359.36
@ .1 grams/yard, 94.06 ounces $131,679.68
My guess is that we should see around 150 to 200 ounces for December because it was a startup and things needed to be tweaked.
The whole point of this math exercise is to point out to the dilution fanatics that even in less than favorable conditions the operation can still be profitable.
Edit: Ther's a strong possibility that December was profitable.