|Upgrades||Ores to use to level up||Stardust cost per XP|
|Empty||Stone, Copper, Tin, Iron||17|
|Above and Silver, Gold||16|
|Above and Quartz, Marble||14|
|Above and Promethium||12|
|Above and Runite||10|
|Halves the ores used when leveling||Unaffected|
Ores efficiency Edit
This table below measures how efficient each ore is when leveling Mining. It indicates which ores should be used to level and which should be sold to the NPC shop.
|Ores||XP per 1000 each||Shop price||XP per 1000 gold|
Stone gives the worst amount of xp per coin, and should either be saved for crafting items such as Oil Storage 6 or Oil Factory, or sold to the NPC shop. Iron has the same efficiency value as gold, but both are slightly worse than silver. Runite and promethium offer much better XP but are also much rarer. In general, marble is the optimal choice for leveling, as it is abundant and delivers a good XP ratio.