Supplemental Guarantor Information Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 92,794	$ 55,645
Receivables	23,484	18,666
Ore on leach pads	74,866	66,192
Inventory	51,210	55,886
Prepaid expenses and other	27,254	14,047
Current assets	269,608	210,436
Property, plant and equipment, net	230,139	248,789
Mining properties, net	716,790	711,955
Ore on leach pads	81,963	71,539
Restricted assets	9,492	8,752
Equity securities	12,943	35,646
Receivables	26,447	28,709
Net investment in subsidiaries	0	0
Other	56,595	62,810
TOTAL ASSETS	1,403,977	1,378,636
Accounts payable	90,577	69,176
Accrued liabilities and other	119,158	95,616
Debt	22,074	22,746
Reclamation	2,299	3,114
Current liabilities	234,108	190,652
Debt	253,427	272,751
Reclamation	136,975	133,417
Deferred tax liabilities	34,202	41,976
Other long-term liabilities	51,786	72,836
Intercompany payable (receivable)	0	0
Non-current liabilities	476,390	520,980
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,751,283 issued and outstanding at December 31, 2020 and 241,529,021 at December 31, 2019	2,438	2,415
Additional paid-in capital	3,610,297	3,598,472
Accumulated deficit	(2,908,120)	(2,933,747)
Accumulated other comprehensive income (loss)	(11,136)	(136)
Stockholders' equity	693,479	667,004	$ 852,512	$ 814,977
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,403,977	1,378,636
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Receivables	0	0
Ore on leach pads	0	0
Inventory	0	0
Prepaid expenses and other	0	0
Current assets	0	0
Property, plant and equipment, net	0	0
Mining properties, net	0	0
Ore on leach pads	0	0
Restricted assets	0	0
Equity securities	0	0
Receivables	0	0
Net investment in subsidiaries	(515,300)	(325,738)
Other	(195,477)	(277,448)
TOTAL ASSETS	(710,777)	(603,186)
Accounts payable	0	0
Accrued liabilities and other	0	0
Debt	0	0
Reclamation	0	0
Current liabilities	0	0
Debt	(195,477)	(277,448)
Reclamation	0	0
Deferred tax liabilities	0	0
Other long-term liabilities	0	0
Intercompany payable (receivable)	0	0
Non-current liabilities	(195,477)	(277,448)
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,751,283 issued and outstanding at December 31, 2020 and 241,529,021 at December 31, 2019	(235,217)	(236,101)
Additional paid-in capital	(2,414,445)	(2,298,162)
Accumulated deficit	2,134,362	2,208,525
Accumulated other comprehensive income (loss)	0	0
Stockholders' equity	(515,300)	(325,738)
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	(710,777)	(603,186)
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	12,727	2,985
Receivables	381	(65)
Ore on leach pads	0	0
Inventory	0	0
Prepaid expenses and other	20,872	6,202
Current assets	33,980	9,122
Property, plant and equipment, net	1,946	2,370
Mining properties, net	0	4,452
Ore on leach pads	0	0
Restricted assets	1,482	1,470
Equity securities	12,943	35,646
Receivables	0	0
Net investment in subsidiaries	514,705	325,723
Other	198,587	267,281
TOTAL ASSETS	763,643	646,064
Accounts payable	1,978	1,277
Accrued liabilities and other	36,183	9,036
Debt	0	0
Reclamation	0	0
Current liabilities	38,161	10,313
Debt	227,592	226,885
Reclamation	0	0
Deferred tax liabilities	100	50
Other long-term liabilities	3,629	4,225
Intercompany payable (receivable)	(199,318)	(262,413)
Non-current liabilities	32,003	(31,253)
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,751,283 issued and outstanding at December 31, 2020 and 241,529,021 at December 31, 2019	2,438	2,415
Additional paid-in capital	3,610,297	3,598,472
Accumulated deficit	(2,908,120)	(2,933,747)
Accumulated other comprehensive income (loss)	(11,136)	(136)
Stockholders' equity	693,479	667,004
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	763,643	646,064
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	28,515	27,217
Receivables	3,631	5,978
Ore on leach pads	74,866	66,192
Inventory	27,223	24,763
Prepaid expenses and other	1,375	1,192
Current assets	135,610	125,342
Property, plant and equipment, net	148,640	167,159
Mining properties, net	353,818	327,685
Ore on leach pads	81,963	71,539
Restricted assets	206	206
Equity securities	0	0
Receivables	0	0
Net investment in subsidiaries	72,785	85,755
Other	51,528	52,040
TOTAL ASSETS	844,550	829,726
Accounts payable	52,177	26,211
Accrued liabilities and other	46,023	35,547
Debt	14,506	15,347
Reclamation	1,584	1,628
Current liabilities	114,290	78,733
Debt	33,321	32,989
Reclamation	93,349	91,524
Deferred tax liabilities	8,457	8,104
Other long-term liabilities	29,916	40,012
Intercompany payable (receivable)	176,914	246,186
Non-current liabilities	341,957	418,815
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,751,283 issued and outstanding at December 31, 2020 and 241,529,021 at December 31, 2019	20,401	20,309
Additional paid-in capital	340,700	337,975
Accumulated deficit	27,202	(26,106)
Accumulated other comprehensive income (loss)	0	0
Stockholders' equity	388,303	332,178
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	844,550	829,726
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	51,552	25,443
Receivables	19,472	12,753
Ore on leach pads	0	0
Inventory	23,987	31,123
Prepaid expenses and other	5,007	6,653
Current assets	100,018	75,972
Property, plant and equipment, net	79,553	79,260
Mining properties, net	362,972	379,818
Ore on leach pads	0	0
Restricted assets	7,804	7,076
Equity securities	0	0
Receivables	26,447	28,709
Net investment in subsidiaries	(72,190)	(85,740)
Other	1,957	20,937
TOTAL ASSETS	506,561	506,032
Accounts payable	36,422	41,688
Accrued liabilities and other	36,952	51,033
Debt	7,568	7,399
Reclamation	715	1,486
Current liabilities	81,657	101,606
Debt	187,991	290,325
Reclamation	43,626	41,893
Deferred tax liabilities	25,645	33,822
Other long-term liabilities	18,241	28,599
Intercompany payable (receivable)	22,404	16,227
Non-current liabilities	297,907	410,866
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,751,283 issued and outstanding at December 31, 2020 and 241,529,021 at December 31, 2019	214,816	215,792
Additional paid-in capital	2,073,745	1,960,187
Accumulated deficit	(2,161,564)	(2,182,419)
Accumulated other comprehensive income (loss)	0	0
Stockholders' equity	126,997	(6,440)
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 506,561	$ 506,032