Prospectors
Concept · Stellaris 4.5.2
Prospectors in the Stellaris encyclopedia: Prospectors produce Minerals
Prospectors in the game's words
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Prospectors produce 
Minerals
Stubborn, ill-mannered, indomitable; these former indentured miners are as solid as scrap metal.
Entries that mention Prospectors
Source: common/game_concepts (concept_low_tech_miner) and localisation/english, Stellaris Cygnus v4.5.2 (9776).