The materials that Saleen listed were enough to build a new Daliang City altogether. Furthermore, it would have been an all-magic city. The materials used for drawing magic arrays themselves were more than what could have been measured using gold.
The main materials for constructing cities were stones and wood, but Daliang City's construct apparently used more metals. There was simply no way Alchemy City would have been able to produce so many of the required metals.
Holy Rock City would have been able to gather ample materials from warehouses all over the place, but that too was not something that could have been accomplished within a day or two.