Change harvest levels: wood mines weak stone, stone mines medium and strong stone, iron mines very strong stone. Same for ores, except strong ores require iron. Since hematite in banded iron formations and magnetite veins in granite are strong, the player needs to get iron from either magnetite sands or limonite clays.
Change harvest levels: wood mines weak stone, stone mines medium and
strong stone, iron mines very strong stone. Same for ores, except
strong ores require iron. Since hematite in banded iron formations and
magnetite veins in granite are strong, the player needs to get iron
from either magnetite sands or limonite clays.

lawremi/PerFabricaAdAstra,lawremi/PerFabricaAdAstra