RE:Cost of pumping 100-150 of water out of mine? Well pumping the water is technically the easy part, except for the 500-700 m pressure differential (head) required. It could be a slow process though and take several weeks at least. It all depends on what kind of access they have to additional pumps and whether there is any restrictions on releasing the water. The challenge is damage to equipment, infrastructure, mine instability, etc. Who knows what that will cost and whether any of it is insured