From the website:
Stake your claim! Get the best patch of land in these gold-filled hills. Roll the dice to claim an area as your own. Steal claims from other players, or double your claim and make an area permanently yours. Keep rolling as long as you want, claiming more land on each roll. But watch out: if you make a bad roll, you lose everything you claimed this turn. Build the biggest system of mines and win it all!
How to Play
Players will claim spaces on the board by rolling three dice. You may keep rolling and claiming more spaces, or you may stop at any time. When you stop, you replace all the white "Squatter" markers with markers of your own color. If you keep rolling, you risk losing what you gained this turn. If you roll a combination of numbers that you cannot use, you bust and all the spaces that you claimed this turn are lost. When the game ends, the player with the largest connected group of spaces wins.