In Spiritfarer, many of your ship upgrades hinge on access to rare materials, and one of the key ingredients you’ll need mid-game is marble. If you’re trying to unlock the Rock Breaker ship upgrade, marble is your next big goal. Fortunately, there is a definitive earliest point in the game when you can acquire it—and it’s more straightforward than trying your luck with crates or hoping for random finds. Here’s your guide to locating and mining marble as early as the game allows.

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Where to Find Marble: Costine Mines

The first reliable location for marble is Costine Mines. This island holds four marble nodes and two coal nodes, plus a few hidden surprises you’ll find as you explore deeper inside. It’s located at coordinates (-99, 117), which places it almost directly south of Masha. If you’ve already unlocked the Icebreaker ship upgrade, you can sail there immediately.

But reaching the island is only part of the challenge—you’ll also need the Zipline ability to explore the mines fully. Without it, much of the content will be inaccessible, and you’ll be locked out of the marble nodes. This ability requires that you’ve activated the first three shrines and completed the respective quests.

Once the prerequisites are met, talk to the NPC at the mine’s entrance to begin the quest that grants access. This NPC will give you the key you need to enter, assuming you’ve advanced far enough in the shrine progression. If you haven’t yet unlocked Zipline, that’s your first order of business.

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Inside the Mines: What to Expect

Costine Mines isn’t just a spot to grab marble and go—it’s layered and can be a bit tricky to navigate, especially with the precision platforming it demands. There are vertical routes, hidden nooks, and multiple floors to explore, some requiring tight zipline timing to reach. If you’re unfamiliar with the zipline mechanic, now’s a good time to sharpen those reflexes. Missed connections can send you tumbling down, and backtracking is common.

Expect to see a few secret areas and environmental puzzles. While not all of them yield marble, they add to the depth of the location and make a return visit worthwhile. During exploration, you may find off-path doors or ledges that hint at something more. Whether it’s coal, special chests, or lore elements, it’s all part of the charm. If you’re feeling adventurous, try hunting those out once you’ve secured your marble haul.

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Tips for Smooth Navigation

• Refine your zipline timing – The mine includes multiple sequences where missing a line will set you back.
• Be patient – There’s a bit of trial and error, especially in tight areas where vertical space is limited.
• Skip the secrets (for now) – If your only goal is marble, you can ignore optional routes and shortcuts.
• Double-check your shrine progress – You must have completed the third shrine to even qualify for Zipline.

And finally, a personal note from the field: don’t be discouraged if you fumble the platforming. The game’s controls, while fluid, take finesse, especially in vertical sequences. A missed jump or awkward zipline connection can send you back down, but persistence pays off.

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Conclusion: Marble Without the Headache

Spiritfarer rewards exploration, but sometimes you just need the material and want to move forward. Costine Mines is your earliest dependable source of marble—and a location you’ll likely revisit later for other reasons. Once you’ve unlocked Zipline and the Icebreaker upgrade, it becomes a simple matter of sailing south, speaking to the mine’s NPC, and delving deep.

So if you’ve been waiting for that Rock Breaker upgrade, this is your moment. Grab your pickaxe, gear up for a little zipline gymnastics, and mine that marble. Good luck, and as always—stay safe out there. See you in game.