The silver credits may already be included. The .75 oz/t in the ore presently being processed is evidently gold equivalents, not just gold. So I would assume the 2.45 oz/t in the Cumberland ore is also Au eq, which would include the silver. These press releases need to be written more clearly and precisely.
At 100 tpd, the Cumberland ore will take almost a year to process. If they ramp up to 400 tpd, only about 3 months. No telling what the prices of silver and gold will be 3 months to a year from now. ;)