Mine Dragon

Breeding
The can be bred by selecting a Metal Dragon or metal hybrid dragon to mate with a Cold Dragon or cold hybrid dragon at the Breeding Cave/Epic Breeding Island.

Breeding a Cold Dragon and a Metal Dragon may also result in a Steel Dragon and has a small chance of resulting in a Silver Dragon.

Earning Rates
Coin per minute: Level 1: 4 / Level 10: 24

Dragon Earning Rates without boosts.

Boost Calculation Guide to use with the page linked above.