Mining Fortune

is a stat that is identical to the and  stats. It increases your chance to get multiple drops from mining ores (It doesn't affect the amount of Cobblestone and other blocks not considered an Ore), and can be increased with your level and HotM upgrades. It functions similar to, in that every 1 of it you get it adds an extra 1% chance to get double drops. Anything above 100 gives a chance for triple drops, anything above 200 gives a chance for quadruple drops, etc.

The max continuous value of the is 673 (300 of HotM upgrades, 240 of max  level, 80 of the Sorrow Armor, 30 of the Fortune Enchantment, 15 of a Refined Titanium Pickaxe or Titanium Drill and 8 of the Auspicious Reforge) granting a 100% chance of a 7x drops and a 73% chance of a 8x drops.

The max possible value of the is 828 (The max continuous value + 100 of the Front Loaded perk, 50 of Sky Mall perk and 25 of the Spelunker 5 effect given by the Mining Pumpkin) which is a 100% chance for x9 drops and a 28% chance for x10 drops.