The troops undertaking the digging in the resource spot consumes double oil than normal and must be stationed in the resource spot. The time of the digging shall be at least 1 hour, and the troops dig more resource with time going by, while the resource obtained ceases to grow with more than 24 hours.
Mountain - Metal
Basin - Crytal
Desert - Oil
The higher level of resource spot is, the more resource you may receive.
Resource Dug = The oil consumption of troops stationed x 1.1 power of the level of resource spot x digging time + the oil consumption of troops
