From Exodus3000 Wiki

Volcanoes are abundant and found all over the world map. When the player stops on a volcano, they have the option to mine it. If the volcano is mined, a random amount of Mars Dollars is rewarded to the player. The player cannot mine the same volcano twice on the same day. Only after the game reset period can the same volcano be mined again.

Rarely to occasionally, the player may find a "Jackpot" after a successful mining expedition of a volcano. A jackpot rewards the player with a large sum of Mars Dollars, ranging from 60-150 Mars Dollars. The chance to find a jackpot increases with the amount of settlements the player governs, joins, and the amount of settlements the player's alliance governs.

When a player manages to hold 20,000 MD or more, the player will have a chance of running into an eruption. Eruptions may occur when the player mines a volcano. This can be stopped by using the No Eruption Cards. Depending on the player's stats, the chance of an eruption occurring is between 1:40 to 1:80, or 2.5% to 1.25%. If the player is unlucky enough to run into an eruption, an amount of Mars Dollars between 2 and 200 is lost.

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