In my estimation they operated at about 50% of the expected capacity during the heavy rainfall of Nov - Dec:
2021 Production Guidance Low End = 11,400
Q1+Q2+Q3 Actual Production = 8,316 tonnes
Q4 Production Expectation (Low End) = 3,084 representing an expected average of 1,028 tonnes per month or 33.5 tonnes per day.
Q4-21 Actual Production = 2,003 tonnes or 1,081 tonnes (35%) lower than expectation. So we can say that the Nov and Dec heavy rainfall caused a production loss of 1,081 tonnes or 17.4 tonnes per day on average in these 2 months as compared to the daily expectation of 33.5 tonnes.