The use of deep resources

Deep shallow earth resources depleted, the utilization of resources is imperative. But now the use of these resources is very difficult, such as mineral hoisting sino hoist from now hundreds of meters to thousands of meters, the existing technology ascension is difficult or can't do it. Has been proved more than 1500 m deep mineral how to mining? With a bold the diameter of the wire rope or increasing the number of effective? Is the line, this choice is reasonable? The handkerchief to ascend, because the whole series of safety problems in a string so its safety coefficient is high, generally in 5 ~ 9. The higher the hoisting height, the bigger the material hoist gantry crane. Rope is coarse, elevator design and manufacture of the greater difficulty will be. Installation, use and change the rope work more difficult. Such as hoisting height above 1500 m, rope only a weight has been considerable. Mine production conditions, due to causes corrosion and other mechanical damage to the steel wire rope, the use fixed number of year, generally very short, every change once caused great waste of resources, and influence the mine production.