The stone will have to be harvested from two quarries which — seen from above — have the shape of either a knife and fork or an umbrella.
Harvesting the resource should not be too difficult, both quarries are literally full of stone:
- The knife and fork are between Salty Springs and Fatal Fields.
- The umbrella is located just southeast of the Block.
Both quarries are visible on the map and can be easily identified from above.
Be careful to place yourself inside the quarries to harvest. Once 100 units of stone have been harvested from one of these quarries, we head to the last stage of the challenge.