Over long periods of time, erosion due to weather broke the rock apart and loosened subsurface pockets of ore.
(erosion due to weather; broke; the rock; apart; T:Over long periods of time) (erosion due to weather; loosened; subsurface pockets of ore; T:Over long periods of time)
erosion due to weather erosion due to weather
broke loosened
the rock apart T:Over long periods of time
subsurface pockets of ore T:Over long periods of time