@elsolivars, BLK's revised (downgraded) guidance for FY20 is 66,000oz @ AISC $1,875/oz.
Up to the end of Mar'20 (FY20 YTD) they've produced 50,518 oz @ AISC $1,708 /oz. If BLK manage to achieve their FY20 production expectations of 66,000 oz @ AISC $1,875/oz, the maths suggests a production of around 15,500 oz @ AISC $2400+ for the Jun'20 quarter. If they produce more than 15,500oz it will help to reduce the expected very high Jun'20 AISC.
If the AISC for the Jun'20 quarter ends up being as you're suggesting (i.e. $1700 - 2000/oz), BLK will have produced a small production miracle (which is probably unlikely considering their Mar'20 production of 12,950 oz @ AISC $2,287/oz).