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Coral Island – The Complete Mining Guide (Updated)

Farming sims are having a moment and from Stardew Valley, we’ve gotten full re-imagined fun with Sun Haven and even My Time At Sandrock. Now we have Coral Island a farming and life sim that has you living out your conservation dreams on a beautiful Southeast Asian tropical island. In this world, you can spend your days growing crops, raising livestock and revitalising the town. And in your free time, there’s always fishing and mining to do!

Mining in Coral Island is not just great to earn money but the ores you collect are necessary to upgrade your Farmhouse and equipment. There are several different mines to go through in the Caverns of Coral Island, types of ores and gemstones, as well as enemies that you encounter. We’ll cover all this and more in our Coral Island mining guide below!

Disclaimer: This article has been updated since its previous post on November 7th 2022.


How To Start Mining

You’ll immediately get a pickaxe on your first day on Coral Island so that you can smash the rocks on the farm. That’s basically the essence of mining, but to get to the Cavern that may take you a few days. Sometime in the first week Mark will show up at your property and tell you about the Caverns on the back of the island. That’s your cue to head on over there.

Enter the Cavern and you’ll run into Kira who will tell you about the mines and that you’ll need to be able to defend yourself against the beasties that live there. She’ll then proceed to you a Blunt Sword before you go in.

When you enter the Cavern, there are four stone doors, which open up to the different mining caverns. Each of the unique caverns will have a different environment, monsters as well as gems and other mining resources. All the mines in the cavern are 40 levels deep, with an elevator that you can unlock every five floors (except for the 35th floor). Every 10th floor of the mine will grant you a reward chest. And after reaching the bottom of the first mine at level 40, it will unlock the next mine and so on.

To start mining all you need to do is approach a rock and hit it with your Pickaxe. Once broken it will release ores, stones or gems. The further you advance in the mines, the harder the rocks become, requiring you to upgrade your pickaxe.


How To Upgrade Your Pickaxe

All pickaxes consume 3 energy per use if they hit a breakable material or 1 energy if the hit fails. However, higher-level pickaxes do more damage per hit, allowing the player to spend their energy more effectively. Some lower-level pickaxes will also be unable to break larger rocks.

NameUpgrade costUpgrade TmeCan breakUpgrade Time
PickaxeFreeRegular rocks1 damage
Bronze Pickaxe2,000g

x1 Pickaxe
x5 Bronze Bar
x20 Wood
1 DayRegular rocks
2 damage
Silver Pickaxe5,000g

x1 Bronze Pickaxe
5x Silver Bar
20x Wood
2 DaysRegular rocks
Big boulders
Metal doors
3 damage
Gold Pickaxe10,000g

x1 Silver Pickaxe
x3 Gold Bar
x5 Hardwood
2 DaysEverything5 damage
Osmium Pickaxe20,000g

5x Osmium Bar
5x Hardwood
4 DaysEverything9 damage

The Mines

The Caverns in Coral Island consist of four different mines. In order to unlock each mine you’ll need to reach the bottom (level 40) of the first mine, to unlock the next. The mines will unlock in this order: Earth, Water, Wind and Fire. The Earth mine will automatically be unlocked at the beginning of the game.

Within each mine, there will be different types of resources that you can mine in the form of stones and geodes. When you break apart a stone it will have a random amount of materials in there, but most commonly Stone and Coal. While a node (it looks like minerals stuck on the stone) will have a higher chance of being able to mine a resource. Besides stones and resources you’ll also be able to find gems, geodes and other random resources such as seeds, wood etc.

There are also places to fish within the mine that aren’t affected by weather or season (excluding special fish).

Earth MineWater MineWind MineFire Mine
ResourcesBronze Ore
Earth Geode
Silver Ore
Water Geode
Gold Ore
Wind Geode
Osmium Ore
Fire Geode
Floor RewardLvl 10 – Ring of Speed
Lvl 20 –  Gold-Encrusted Hammer
Lvl 30 – Spikes x12
Lvl 40 – Jamu x4
Lvl 10 – Candied Tree Seed x8
Lvl 20 –  Amber Shield Ring
Lvl 30 – Explosive II x10
Lvl 40 – Jamu x6
Lvl 10 – Decoy x10
Lvl 20 –  Forager Ring
Lvl 30 – Jamu x4
Lvl 40 – Jamu x15
Lvl 10 – Explosive III x10
Lvl 20 –  Flameguard Greatsword
Lvl 30 – Blessed Opal Ring
Lvl 40 – Explosive III x25
FishBlue Tang
Silver Arowana (Winter)
Freshwater Eel
Red King Arowana (Fall)
Silver Arowana (Winter)
Pink Snapper
Polka-Dot Batfish
Red King Arowana (Fall)
Silver Arowana (Winter)
Red King Arowana (Fall)


Geodes are a type of special rock that you’ll find while mining in the caverns. They can’t be broken by you but if you bring them to the Blacksmith they’ll be able to work them open for you for 20g. These Geodes will often contain rare gems and other materials.

GeodePossible Drops
GeodeStone, Coal, Bronze Ore, Silver Ore, Black Opal, Diorite, Fire Agate, Granite, Jasper, Lepidolite, Marble, Morganite, Pink Crystal, Red Beryl, Topaz
Earth GeodeStone, Coal, Bronze Ore, Silver Ore, Black Opal, Diorite, Fire Agate, Granite, Jasper, Lepidolite, Marble, Morganite, Pink Crystal, Red Beryl
Water GeodeStone, Coal, Bronze Ore, Silver Ore, Gold Ore, Aquamarine, Azurite, Beryl, Blue Quartz, Crystal, Diamond, Moonstone, Quartz
Wind GeodeStone, Coal, Bronze Ore, Silver Ore, Gold Ore, Amber, Amethyst, Emerald, Jade, Peridot, Pink Diamond, Serpentine, Variscite
Fire GeodeStone, Coal, Bronze Ore, Silver Ore, Gold Ore, Garnet, Labradorite, Onyx, Opal, Purple Crystal, Rhodonite, Rose Quartz, Ruby, Topaz
Mystery GeodeStone, Coal, Bronze Ore, Silver Ore, Gold Ore, Osmium Ore, Amber, Amethyst, Aquamarine, Azurite, Beryl, Black Opal, Blue Quartz, Crystal, Diamond, Diorite, Emerald, Fire Agate, Garnet, Granite, Jade, Jasper, Labradorite, Lepidolite, Marble, Moonstone, Morganite, Onyx, Opal, Peridot, Pink Crystal, Pink Diamond, Purple Crystal, Quartz, Red Beryl, Rhodonite, Rose Quartz, Ruby, Serpentine, Topaz, Variscite

Traversing The Mines

Traverse the mine via rope or elevator, use them when you need to return to the surface. But with the elevator, unlike the rope, you’ll be able to jump to another elevator stop point that you’ve discovered. You won’t be able to hop around the mine from the elevator on Day One, instead, you’ll need to unlock it by discovering it, which you’ll be able to do every five levels or so.

To move further down the mine without the use of an elevator simply mine all the rocks around you. Eventually, you’ll find a hole which will drop you into the level below you.

Though the rule is that you’ll find an elevator every five levels, there’s an exception when you’re at level 30 of the Cavern. Instead of 5 levels down the next elevator will be ten levels down, not five. So remember to pack for an extended, difficult trip to reach level 40, which is the bottom.

The contents of the Cavern are randomized each day, and it doesn’t appear that ore or gems become more abundant as you go lower and lower. So if you’re just mining for ore it shouldn’t matter which level you go to.



Exploring the Cavern is probably the least peaceful aspect of Coral Island because of the monsters. These creatures can inflict damage to your Health, so you’ll need to clear them out with combat before your HP runs down to zero. Once you run out of Health your trip into the Cavern will end for that day.

It’s generally a smart move to clear out any monsters populating a floor before you look for the exit, and since swinging your weapon doesn’t cost any Energy there’s nothing to lose besides time if you go for the monsters first. For more information check out our combat and weapons guide here.


Smelting Ore

Metal bars are one of the key resources in Coral Island, and in order to craft them, you’ll need a Furnace and some ore. Start by crafting the furnace. You should receive this recipe quite early on in the game after mining a little bit. Simply press the letter T on your keyboard to open up the crafting menu. From there, select the furnace to craft it.

Furnace Recipe: 40x Stone, 20x Bronze Ore 

Metal BarRecipeTimeUtilise
Bronze Bar5x Bronze Ore
1x Coal
6hTool Upgrades
House Upgrade
Mayonnaise Machine
Coop, Barn, Mill
Silver Bar5x Silver Ore12hTool Upgrades
House Upgrade
Yoghurt Machine
Gold Bar5x Gold Ore
1x Coal
24hTool Upgrades
Osmium Bar5x Osmium Ore
1x Coal
36hTool Upgrades

Mining Mastery Skills

SkillDescription and effect
Double Ore20% chance to mine double ores.
Rock Domino10% chance to break surrounding rocks when mining.
Geode Finder100% increases the chance of finding geodes.
Rare Rocks1% chance for regular rocks to drop rare resources.
Gem Price15% increase to the selling price of all gems.
Double Gems5% Chance to find double gems.

Coral Island

Coral Island is a vibrant and laid-back reimagining of farm sim games. Be who you want and create the idyllic farm of your dreams, where you’ll tend crops, nurture animals, and build a bond with the natural world around you. Help revitalize the nearby town and its surrounding coral reefs, and forge relationships with a vibrant community of more than 70 fellow people who call Coral Island home.

Coral Island is currently out on PC – Steam and Xbox Game Pass.


Coral Island Guides