There is no guide about the golden chests here on steam, so i will put it here. This is my first guide so i will make this quick and simple. I will put all the coordinates in 1 screen so you can see all the coordinates at once.
 
 

Coordinates

(you can find your coordinates at the lower left part of the screen)
 
 
The Western Ridge First Chest (1): 263:28:478
 
 
The Shipwreck Second Chest (2): 276:167:1018
 
 
The Iridium Caves Third Chest (3): 832:50:1208
 
 
The Ridge Labyrinth Fourth Chest (4): 1510:9:665
 
 
The Moat Fifth Chest (5): 938:24:324
 
 
The Aluminium Hills Sixth Chest (6): 1076:23:-16
 
 
The Field of Spiked Columns Seventh Chest (7): 402:4:-267
 
 
The Sandstorm Wall Cave Eighth Chest (8): 473:65:1567
 
 
Grand Canyon (9): 2158:3:241
 
 
I don’t plan to upload images, I will leave you guys the fun of finding them.
 
 
 

CREDIT

I plagiarized (kinda), here is the guide (and comment) that helped me find them:
 
https://gameplay.tips/guides/the-planet-crafter-prologue-all-golden-chests-locations.html – [gameplay.tips] 
 
 

 
 
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