Isotopes

Isotopes are a rare kind of material. Your miners will begin to mine isotopes at 24km depth.

While isotopes can be sold in the Sell Center for money, although almost never sold for money as they come slower than minerals. You need them for many Blueprints, Gem Forge, and much more once you reach the reactor, and there is no other source of isotopes than mining.

Earth[]

Uranium[]

Uranium is the most common Earth isotope. It will start occuring at level 24 and achieve maximum at 33 (upgrades and miners still increase the amount you get, but not depth).

Uranium 1: $100 / unit

Uranium 2: $2,000 / unit

Uranium 3: $50,000 / unit

Plutonium[]

Plutonium will start occuring at level 34 and achieve maximum at 53 (upgrades and miners still increase the amount you get, but not depth).

Plutonium 1: $1,000 / unit

Plutonium 2: $20,000 / unit

Plutonium 3: $500,000 / unit

Polonium[]

Polonium is the rarest Earth isotope. It will start occuring at level 54 and achieve maximum at 83 (upgrades and miners still increase the amount you get, but not depth).

Polonium 1: $5,000 / unit