The new levels of buildings require huge amounts of resources and donating to the mines is not cost-effective, so I would like to suggest a building that allows you to employ more people in the mines.
I note that the wine costs for populations has been significantly reduced, allowing vastly increased populations, so let's put that population to use.
Call it the Employment Bureau. Required researches would be Helping Hands and Logistics. Each level of the building would allow 1% more people to be fully employed gathering each resource. (I'm basing this of the 2% improvement the other improvers give, 1% for Building Material and 1% for the Luxury Resource.) Option: after researching Bureaucracy allow extra Scientists and Priests too. Cost would be similar to the other improvers. Note that this building is self-balancing as you have to have the population to employ, which means high level Town Halls, which mean you need extra Priests in the Temple and extra Spies in the Hideout and greater wine usage, and it means less gold income. A second advantage is that this building gives more flexibility: you can surge production of one resource over the other. Bonuses from improvers like the Winery would be cumulative. Ambrosia, Helios, Helping Hands, Technocracy, Cinetheatre, etc would also apply and work off the new number of people employed.
Example: I have a level 37 Vineyard so can normally employ 1266 citizens, and have a level 25 Employment Bureau and level 32 Winery. I can now employ 1582 citizens and produce 2595 wine. If I have a 20% Premium Bonus then I will produce 2912 wine. Add in Cinetheatre for 3228 wine. But I have to have those 316 extra citizens to employ and my gold income is reduced by 948 gold per hour. Those 316 extra citizens will require an extra 2 - 3 levels of the Town Hall and 3 - 4 levels of Tavern and extra Priests to keep Faith at 100%.