I find these two, bonus and discounts to be the most confusing.
As I understand it, a discount tile acts as an ADDITIONAL DIE, it helps you acquire an artifact in one of the excavations. But the discount can only be used if the tile matches the excavation. What happens to the discount tile when the excavation is deleted?
The bonus cards A give extra fame and clocks when a player reaches a matching spot on the expedition map. Since the spots on the expedition map, alternate between a clock and Map/Treasure cards; Bonus A tiles can be used every time the die goal is met when a player marker is on the expedition map.
The bonus B cards give extra fame and clocks when an artifact is achieved on an excavation. Bonus B cards can be used for either excavations.
I think a clearer explanation for these Bonus and Discount cards would be helpful.
Discount is for excavation as you say. What do you mean when deleted? At end of game?
Was there a question on bonuses?