im wondering if i have miss any announcement about TLRPG mining the first 90 day's it was costing me about 4.3k bronze for 1h of mining now since the second 90 day's it cost me my whole bronze balance witch represent right now 1.5m bronze for 1h is there something i have miss or something wrong ? everytime i go see it cost more exactly the balance of bronze
If your question relates to precisely what you're seeing on the image you posted, that's merely telling you your bronze balance from which you will pay for the refueling, not how much it will cost. Click on "Fuel with Bronze" and then you'll see options along with their costs. (You can even do a custom amounts.)
If it's about the costs increasing overall, that's covered here (scroll down on the TLRPG Mining page):
