AnotherGame is a mod for ToE 3.1.

It doesn't solve the problem of resource allocation efficiency, but it does allow you to reduce the gold expenditure and increase the surplus of other resources. Therefore, I support this idea. Another question is whether upgrading a mine for a specific resource will be worthwhile.

Here's a suggestion:
- Mine upgrades will only be available after building a warehouse, so the upgrade will cost less (1000 gold, 5 wood, and 5 stone);
- Heroes can only upgrade mines if they are level 10 or higher;
- A new perk could be created that allows for a free upgrade.
....
In my opinion, the first option is quite reasonable.