Got some good feedback that the difference between the mines quest that grants you the next level of ore and the one that was just about monsters attacking in the mines was confusing. So I changed the way it works!
The quest that grants the next level of Ore is still called "New Ore Discovery" and overall remains unchanged. I did update the quest manager to make sure this quest gets picked in a reasonable amount of time once it's available. In the old system it was possible to get really unlucky and not get to upgrade to the next ore for a long time leaving you unable to craft the next set of armor and weapons.
The bigger change is to the quest that used to be called "New Mine Level". It's now called "Enemy in the Mines" and its been updated to be more clear that this quest is for existing levels, not for a new level with new ore. When this quest is active, your miners will also be a little bit less efficient, reducing the amount of ore they deliver to the storehouse.