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Mining rights (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Mineral Industries Disclosures [Line Items]    
Mining Development Cost      
Less amortization and accretion expense      
Mineral Rights    433,000us-gaap_MineralRights
Dodge Mines [Member]    
Mineral Industries Disclosures [Line Items]    
Mineral Rights    $ 433,000us-gaap_MineralRights
/ us-gaap_StatementClassOfStockAxis
= mbmi_DodgeMinesMember