For example the Iron resources will not be available until we investigate the mining… Download Mads Tech Tree MOD for Civilization 6 Thanks to Mads Tech Tree MOD we will have much more realistic eras and technological advances much more consistent with the era in which we find ourselves. The technology tree is one of the fundamental aspects of “Civil” since we must advance through it to improve each of our technologies and in turn move from one era to another, with its relevant advantages. However, being simple does not mean that it does not fulfill its function or that it is dispensable. Mads Tech Tree MOD is one of the simplest MODs of all Civilization VI.