By clicking on the underground astronomy link you can verify daylight hours for operations -a question asked last year ca this time- still near 12 hours/day-w official light 30 minutes before and after sunrise/set --the basic schedule for last year and more-plus they have lights for critical night operations.

In ca june bingo said they were working 7 days /week on processing ca 200k tons 0-1mm with trommel-perhaps as much as 24 hours/day-see bingos posts- and then received the separate magnetic separator for the trommel July 3-only apparently to learn the govt had changed the rules again and were now requiring an iron export permit for the fert-thus delaying any shipment since steelmakers werent buying in August /Sept.