Mine

Mine is a Primary Industry card in Machi Koro, available in the base game.

Gameplay
When the card's activation number of 9 is rolled by any player, the player with the card gets 5 coins from the bank on anyone's turn.

Strategy
The per-turn expected value of the card depends on whether the player uses the Train Station establishment to roll two dice, and how many Furniture Factories they own:

Or:

The card's value is multiplied again by how many Mines the player owns.

Diamine
The Diamine is an alternate-art replacement for the Mine in the Deluxe Edition of the game. The card's effect and activation number is identical to the mine.

The diamine card has slightly different artwork for each copy of the card, with a different collection of small Yeti like creatures (called Diamonsters) in different positions on each.