Supplemental Guarantor Information Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Receivables	$ 22,606	$ 23,484
Ore on leach pads	78,689	74,866
Inventory	53,591	51,210
Prepaid expenses and other	27,274	27,254
Current assets	336,226	269,608
Property, plant and equipment, net	248,237	230,139
Equity securities		12,943
Other	60,590	56,595
TOTAL ASSETS	1,515,415	1,403,977
Accounts payable	96,715	90,577
Accrued liabilities and other	62,682	119,158
Debt	21,404	22,074
Reclamation	2,299	2,299
Current liabilities	183,100	234,108
Debt	390,721	253,427
Reclamation	139,112	136,975
Deferred tax liabilities	34,577	34,202
Other long-term liabilities	47,399	51,786
Non-current liabilities	611,809	476,390
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,469,002 issued and outstanding at March 31, 2021 and 243,751,283 at December 31, 2020	2,435	2,438
Additional paid-in capital	3,610,631	3,610,297
Accumulated deficit	(2,906,060)	(2,908,120)
Accumulated other comprehensive income (loss)	13,500	(11,136)
Stockholders' equity	720,506	693,479	$ 660,644	$ 667,004
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,515,415	1,403,977
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	79,288	12,727
Receivables	396	381
Ore on leach pads	0	0
Inventory	0	0
Prepaid expenses and other	21,664	20,872
Current assets	101,348	33,980
Property, plant and equipment, net	1,987	1,946
Mining properties, net	0	0
Ore on leach pads	0	0
Restricted assets	1,481	1,482
Equity securities	8,209	12,943
Net investment in subsidiaries	554,504	514,705
Other	195,236	198,587
TOTAL ASSETS	862,765	763,643
Accounts payable	1,956	1,978
Accrued liabilities and other	6,598	36,183
Debt	0	0
Reclamation	0	0
Current liabilities	8,554	38,161
Debt	367,572	227,592
Reclamation	0	0
Deferred tax liabilities	151	100
Other long-term liabilities	3,643	3,629
Intercompany payable (receivable)	(237,661)	(199,318)
Non-current liabilities	133,705	32,003
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,469,002 issued and outstanding at March 31, 2021 and 243,751,283 at December 31, 2020	2,435	2,438
Additional paid-in capital	3,610,631	3,610,297
Accumulated deficit	(2,906,060)	(2,908,120)
Accumulated other comprehensive income (loss)	13,500	(11,136)
Stockholders' equity	720,506	693,479
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	862,765	763,643
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	33,008	28,515
Receivables	5,431	3,631
Ore on leach pads	78,689	74,866
Inventory	27,526	27,223
Prepaid expenses and other	854	1,375
Current assets	145,508	135,610
Property, plant and equipment, net	156,359	148,640
Mining properties, net	373,135	353,818
Ore on leach pads	87,723	81,963
Restricted assets	206	206
Equity securities	0	0
Net investment in subsidiaries	69,106	72,785
Other	54,160	51,528
TOTAL ASSETS	886,197	844,550
Accounts payable	54,978	52,177
Accrued liabilities and other	34,684	46,023
Debt	13,709	14,506
Reclamation	1,584	1,584
Current liabilities	104,955	114,290
Debt	35,970	33,321
Reclamation	94,718	93,349
Deferred tax liabilities	8,597	8,457
Other long-term liabilities	27,374	29,916
Intercompany payable (receivable)	214,056	176,914
Non-current liabilities	380,715	341,957
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,469,002 issued and outstanding at March 31, 2021 and 243,751,283 at December 31, 2020	19,356	20,401
Additional paid-in capital	340,700	340,700
Accumulated deficit	40,471	27,202
Accumulated other comprehensive income (loss)	0	0
Stockholders' equity	400,527	388,303
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 886,197	$ 844,550