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Consolidated Statements of Income (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
REVENUE      
Artifact sales and other $ 23,670,264 $ 8,036,658 $ 853,627
Exhibit 112,129 225,000 207,289
Expedition 131,556 4,935,857 14,666,316
Total revenue 23,913,949 13,197,515 15,727,232
OPERATING EXPENSES      
Cost of sales - artifacts and other 694,787 235,537 414,993
Operations and research 26,024,548 17,941,573 21,288,476
Marketing, general and administrative 14,161,465 10,606,281 9,392,465
Total operating expenses 40,880,800 28,783,391 31,095,934
LOSS FROM OPERATIONS (16,966,851) (15,585,876) (15,368,702)
OTHER INCOME OR (EXPENSE)      
Interest income 9,966 24,420 3,875
Interest expense (3,581,642) (6,263,589) (1,155,072)
Change in derivative liabilities fair value 4,385,380 3,631,930 4,980,138
Gain on silver fixed price swap 1,206,350    
(Loss) from unconsolidated entity     (4,733,100)
Other 581,543 9,002 47,553
Total other income or (expense) 2,601,597 (2,598,237) (856,606)
LOSS BEFORE INCOME TAXES (14,365,254) (18,184,113) (16,225,308)
Income tax (provision) (496,055)      
NET (LOSS) BEFORE NON-CONTROLLING INTEREST (14,861,309) (18,184,113) (16,225,308)
Non-controlling interest 4,120,037    
NET (LOSS) $ (10,741,272) $ (18,184,113) $ (16,225,308)
LOSS PER SHARE      
Basic and diluted $ (0.13) $ (0.25) $ (0.28)
Weighted average number of common shares outstanding      
Basic and diluted 80,128,827 73,889,112 70,179,935