You are probably mining with just regular mines, which is not how you make money. To make efficient money I recommend gathering St. Pats Feet, which generates emerald blocks on blocks you walk on (~140s cooldown i think) an extractor for double ores, and gorgon pick because it has fortune 4. There are also other optional items like compressor, winged vest, elecromag to make your life easier, but the st. pats feet is mainly what you need.
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