All iron mines in the Great Yan Dynasty were controlled by the Imperial Court, but none of the mines produced ironstone as densely as the one before them.
Ordinary iron mines required washing and screening to extract about twenty to thirty percent ironstone, but here almost ninety percent of it was ironstone, in tremendous quantities.
The demand for ironstone for agricultural and military tools in the Great Yan Dynasty was also significant. Because mining was challenging and the other iron mines were impure, the Imperial Court strictly controlled the quantity of metal tools.
This iron mine might not compare to all the ironstone of the Imperial Court, but it was at least comparable to more than half of it.
Murong Jiu was very satisfied.
The craftsmen of the porcelain workshop also said that the soil in the mountains was suitable for making porcelain, so they could legitimately mine under the guise of digging for soil.