Can someone help me.

I was looking at financials

I see ore milled in tons: Q3=175,311 Q2=162,344 Q1=156,013

Also see head grade in g/tonne: Q3=4.24 Q2=5.05 Q1=4.15

if i convert that to troy oz: Q3=0.136 Q2=0.162 Q1=0.133

If i do the math that means the oz contained should be: Q3=23842 Q2=26299 Q1=20749

They list it at: Q3=21672 Q2=23964 Q1=18884

Where did the other 6370 oz go? thats over 6 million dollars missing for the last 3 quarters.

I see the mill recovery % but that corelates to the oz produced.