The Mines Key is a key item in Sea of Stars. It is found in a treasure chest at the Wind Tunnel Mines. It is used to open a locked door within the Wind Tunnel Mines, leading to a treasure chest that contains the Trader's Signet.
| Key Items in Sea of Stars | |
|---|---|
| Keys | Cookie Jar • Docarri Seal Fragment A • Docarri Seal Fragment B • Docarri Seal Fragment C • Solstice Shrine Key A • Aventry Locket • Solstice Shrine Key B • Duke Aventry's Key • Gilded Invitation • Hook of Time • Fish Key • Fishing Dungeon Key • Romaya's Journal • Rainbow Star • Cypher • Data Strip • Trader's Signet • Big Jar • Fish? • Crystal Egg • Probe • Wireplate Sheet • Kyber Ore • Power Unit • Crane Operator ID Card • Blueprint Disc • Immaculate Pearl • Cobalt Hammer • Wind Key • Triangular Slab • Hexagonal Slab • Deployable Wheels Table • Master Key • Yomara's Key • Garden Key • Vial of Time • Solstice Amulet • Valve • Yellow Pearl • Purple Pearl • Pink Pearl • Green Pearl • Blue Pearl • Sapphire Key • Coral Hammer • Moraine's Office Key • Evermist Shrine Key • Seashell • Magic Seashell • Cursed Doubloon • Map • Shed Key • Turbo Cookie • Graplou • Master Ghost Sandwich • Ordinary Ghost Sandwich • Knight's Helm • Crown • Yellow Flame • Soul Stone • Green Flame • Coin of Undeath Accord • Golden Watch • Red Crystal • Blue Crystal • Green Crystal • Mistral Bracelet • Mines Key • Solstice Diploma • Ornate Stone • Forbidden Cavern Key |
| Question Packs | Question Pack #1 • Question Pack #2 • Question Pack #3 • Question Pack #4 • Question Pack #5 • Question Pack #6 • Question Pack #7 • Question Pack #8 • Question Pack #9 • Question Pack #10 • Question Pack #11 |
| Music Sheets | Music Sheet #1 • Music Sheet #2 • Music Sheet #3 • Music Sheet #4 • Music Sheet #5 • Music Sheet #6 • Music Sheet #7 |
| Artifacts | Stone Tablet Piece • Romaya's Hairpin • Ancient Molekin Cloak • Cloudy Shard • Old Coral Vase • Celestial Willow Leaf • Aventry Crest • Broken Handle • Cog Prototype • Joce's Belt Buckle |
| Building Plans | Inn Plans • Spa Plans • Shop Plans • Fishing Hut Plans |
| Wheels | Assassin Figurine • Priest Figurine • Engineer Figurine • Archer Figurine • Mage Figurine • Warrior Figurine • Platinum Wheel • Diamond Wheel • Solstice Doctorate • Gold Wheel • Silver Wheel • Bronze Wheel • Copper Wheel |
| Collectibles | Flimsy Hammer • Rainbow Conch |