I bought the iron update today. And it say that it gives you iron every minute.
I did mine few times and still are on the 1 iron in my account.
Is this feature not working yet or a bug ?
Resource upgrades work fine, only gold is affected by how many workers/other upgrades you have.
So you will always earn 1/min for each resource ore you have.
Examples:
5 iron ores = 5 iron/min
3 gem ores = 3 gems/min
etc.
You have to mine for gold like usual to earn any resources.
St. Bernard Lake will only give gold, never resources.