There will always be mineral remaining in the circuit unless...

There will always be mineral remaining in the circuit unless they do a full shut down and clean up which they would not do whilst they are intent on processing.
Because there has been no indication of tons mined, milled or recovery it is not possible to determine head grade - we can only speculate. If we assume that they ran the mill for one shift (say 10 hours) at nameplate capacity of 10 tph then we could assume that they processed 100 tons of material for 220grams - (7oz) - 2.2g/t. If we assume that they are working three headings, breaking 20 tons per heading per shift and milled five days of production then they would have processed 300 tons for 220grams. All hypothetical which is what you get if only part of the story is told.