v3.26.1
Controlled entities (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2025
Jun. 30, 2025
List of subsidiary companies [Abstract]    
Ownership interest 100.00% 100.00%
Ioneer USA Corporation [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Ioneer USA Corporation  
Country of incorporation USA  
Ownership interest 100.00% 100.00%
Ioneer Minerals Corporation [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Ioneer Minerals Corporation  
Country of incorporation USA  
Ownership interest 100.00% 100.00%
Ioneer Holdings USA Inc. [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Ioneer Holdings USA Inc.  
Country of incorporation USA  
Ownership interest 100.00% 100.00%
Ioneer Holdings Nevada Inc. [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Ioneer Holdings Nevada Inc.  
Country of incorporation USA  
Ownership interest 100.00% 100.00%
Gerlach Gold LLC [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Gerlach Gold LLC  
Country of incorporation USA  
Ownership interest 100.00% 100.00%
Paradigm AZ LLC [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Paradigm AZ LLC  
Country of incorporation USA  
Ownership interest 100.00% 100.00%
Ioneer Rhyolite Ridge Holdings LLC [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Ioneer Rhyolite Ridge Holdings LLC  
Country of incorporation USA  
Ownership interest 100.00% 100.00%
Ioneer Rhyolite Ridge Midco LLC [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Ioneer Rhyolite Ridge Midco LLC  
Country of incorporation USA  
Ownership interest 100.00% 100.00%
Ioneer Rhyolite Ridge LLC [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Ioneer Rhyolite Ridge LLC  
Country of incorporation USA  
Ownership interest 100.00% 100.00%
Ioneer Canada ULC [Member]    
List of subsidiary companies [Abstract]    
Name of subsidiary Ioneer Canada ULC  
Country of incorporation Canada  
Ownership interest 100.00% 100.00%