When you kill your daily quest monsters it has a counter how many you have killed. It would be nice to have it on the mining too. There are some cases that you might encounter 2-4 crystal but you already have 19 kills before you warped out. The extra loots however are not accounted for anymore so you have to quickly go in. Once you go back in you always have to check the last spot you have been just in case it dropped something while you were outside.
[Crystal Mine] You have killed 4/20 Strange Crystals, keep it up!
Jump and burn them all.