It was really nice and fun! I think the last 2 (iron and gold) ores have an additional zero at the end on their value, and that's making the game to be able to finish too soon.
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Thank yoou! I have solved that problem and tested in new build but it would be unfair to resubmit new file and I have left it this way since it does not break the game. Formula is correctly shown on UI but real value calculated is tied to "stone" ore property rather than each ore's unique levels. Thanks for details :)