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Changes in ounces of silver and their respective values for the three months ended March 31, 2021 and 2020 are set out below: (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
oz
Mar. 31, 2020
USD ($)
oz
Accounting Policies [Abstract]    
Opening balance | oz 32,617,862.0 23,216,266.6
Creations | oz 5,989,089.7 1,598,124.6
Redemptions | oz (1,641,982.4) (726,786.2)
Transfers of silver to pay expenses | oz (25,386.9) (17,118.0)
Closing balance | oz 36,939,582.4 24,070,487.0
Opening balance $ 863,884 $ 418,938
Creations 160,444 22,956
Redemptions (45,079) (13,099)
Realized gain / (loss) on silver distributed for the redemption of Shares 13,011 (112)
Transfers of silver to pay expenses (674) (307)
Realized gain / (loss) on silver transferred to pay expenses 184 (3)
Change in unrealized (loss) on investment in silver (105,220) (93,071)
Closing balance $ 886,550 $ 335,302