Mining
The Motherlode
The vault that fills every shift.
Every shift sends 10% of its $DIG emission into the Motherlode vault, where it builds until the vault opens.
Each shift has a 1 in 500 chance of opening it. When it opens, the full balance is paid to the diggers on the plot that broke through, in proportion to the SOL each put there, and the vault starts again from zero.
If the plot that breaks through has nobody on it, that shift's $DIG emission also goes into the vault.