Paydirt -

Community members often recommend brands like Klesh Gold for guaranteed gold amounts or Vendetta Prospecting for a better return on investment (ROI). 3. "Pay-dirt" in Gaming (OSRS)

pay dirt, n. meanings, etymology and more - Oxford English Dictionary Paydirt

"The startup hit paydirt after their third round of funding." Community members often recommend brands like Klesh Gold

The term dates back to the California Gold Rush in the 1850s, when miners used it to describe soil that was actually worth the hard work of panning. 2. Hobbyist "Gold Paydirt" meanings, etymology and more - Oxford English Dictionary

For modern prospectors, you can actually buy bags of "paydirt" online to practice panning at home. If you are looking to get into this hobby, experienced miners on the GPAA Forum suggest:

Use it to test new equipment or keep your panning skills sharp during winter when you can't get to a river.