Motherlode Mine calculator

Each pay-dirt gives 60 Mining XP plus bonus XP when the ore is cleaned from the sack (~21.9 at level 99), so ~82 XP/pay-dirt at 99. The ore is random (probabilities shown are at 99 Mining). ~750 pay-dirt/hr (~62k XP/hr; up to ~64k with the upper level, prospector outfit and an upgraded hopper). Also ~1 Golden nugget per 32 (untradeable — spent with Prospector Percy).

Profit and XP shown per hour at the rate above (edit it to match your play). Prices are live from the Grand Exchange.