👉 In geology and mining, a "sub-overseer" refers to an area or area that is part of or below the surface level of the parent rock. This can be defined as any region where the underlying rock is less than 10 feet deep, such as soil, sandstone, or gravel. For example, if you were digging under a river bed and were looking for a sub-overseer, you would need to find areas that are not directly exposed to the water table
