Too many hourglasses in Mirage

When I farm ores for Kingsmarch it is quite common to get 2 hourglasses in place of ores in Mirage. This has a significant impact on the amount of ore I can farm since I rarely get more than 3 ores in Mirage. In the strategy that I use I don't need dust so the dust is useless to me. Limit the number of hourglasses to one or better yet add them as a separate item that doesn't replace ores.