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Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
CASH FLOWS FROM OPERATING ACTIVITIES:      
Proceeds from sales of silver $ 29,257 $ 18,718 $ 14,313
Expenses - Sponsor's fees paid (29,257) (18,718) (14,313)
Net cash provided by operating activities         
Increase (decrease) in cash         
Cash, beginning of period         
Cash, end of period         
RECONCILIATION OF NET INCOME (LOSS) TO NET CASH PROVIDED BY OPERATING ACTIVITIES:      
Net income (loss) 234,419 2,739 (31,561)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
(Gain) loss on silver distributed for the redemption of shares (257,403) (21,395) 18,826
Cost of silver sold to pay expenses 20,954 17,296 12,694
Increase in Sponsor's fees payable 2,030 1,360 41
Net cash provided by operating activities         
Supplemental disclosure of non-cash information:      
Carrying value of silver received for creation of Shares 2,040,507 1,575,673 1,438,131
Carrying value of silver distributed for redemption of Shares, at average cost $ (579,557) $ (276,552) $ (335,617)