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Capital Stock - Additional Information (Details) - USD ($)
12 Months Ended
Apr. 17, 2015
Jun. 30, 2015
Jun. 30, 2014
Feb. 19, 2015
Jun. 30, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Capital stock, shares authorized   50,000,000 25,000    
Capital stock, par value $ 0.01 $ 0.01      
Common stock, no par value          
Capital stock, shares issued   8,518,791 1,000    
Capital stock, shares outstanding   8,518,791 1,000    
Cancellation of treasury stock       1,000  
Contribution from PGSC $ 8,450,000        
Additional paid In capital connection with separation agreement   $ 15,866,870      
Common stock, par value $ 0.01 $ 0.01      
Cash received in exchange for shares issued   $ 1,470,000      
Weighted-average grant-date fair value of options granted   $ 1.13      
Total unrecognized compensation cost related to nonvested share based compensation   $ 737,368      
Expected weighted-average period of unrecognized compensation cost   1 year 6 months      
Total fair values shares vested   $ 360,519 $ 0    
2015 Stock Incentive and Compensation Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted average remaining contractual term (in years), grants   5 years      
2015 Stock Incentive and Compensation Plan | Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of options and shares available for grant to employees   1,278,000      
Coeur Mining Inc.          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Cash received in exchange for shares issued $ 1,470,000        
Common Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Capital stock, shares outstanding   8,518,791 1,000   1,000
Shares issued in distribution to PGSC stockholders   8,101,371      
Common Stock | Coeur Mining Inc.          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issued 417,420        
Spinoff | Common Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issued in distribution to PGSC stockholders 8,101,371