I agree though the tech tree presents some problems with this I think. North American Natives did not mine. This wasn't because they didn't see any potential reason to so much as they had a spiritual objection to it. As a result, they never developed past an Ancient Era. However, that is NOT to say that they did not achieve anything in all that time, technologically. I feel that they had continued to master various 'civics' and harmonious ways of working with the land to increase its overall health and capacity to provide agricultural and animal products in ways that our modern society takes for granted that we learned it from them and still fails to master in practice due to a lack of comparable values. In essence, this means they took a different tech path entirely, one more spiritual - not religious - but emotional, EQ focused, one of wisdom over intellect, health over dominance.
I have often considered adding a 'spiritual' property (though I think the term needs to be changed to something that doesn't indicate anything religious to anyone), something that represents integrity and wisdom, that if you take the standard European development path you'll have a resultingly horrendous problem with and if you take a less aggressive approach to the game you'll excel at, along with an alternative tech tree that switches at whether you will take this path or the path of industry through mining. It would probably need to be a modmod or option because it would not work for those who want to only have one page worth of tech tree on the y axis. Means to reach some really powerful spiritual stuff would be available down that road, equally as strong, in the end, and perhaps in some ways achieved earlier, as the industrially driven accomplishments of the future eras.
This could be a very long term future design project anyhow. All inspired based on agreement with what you expressed.