Refining Ticket Overflow
Solution 1:
A player can only ever have the maximum number of tickets, which I've only ever seen as 10 but I suppose it could change or they may add a way to increase it. If you log in with 9/10 tickets on the day you should receive 6, you will be given 1 to bring your total to 10/10.
I generally keep 4 tickets, and each day either use the 3 given on a yellow ore or if it's the 6 day, use all 10 on a purple. You can spend single tickets to speed up the current ore refinement by 1 hour, so when I get 6 I generally spend 2 on a yellow or purple.