Supplemental Guarantor Information Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 85,020			$ 92,794	$ 77,148
Receivables	22,956			23,484
Ore on leach pads	74,803			74,866
Inventory	52,334			51,210
Prepaid expenses and other	17,846			27,254
Current assets	307,437			269,608
Property, plant and equipment, net	298,006			230,139
Restricted assets	9,160			9,492
Equity securities	139,740			12,943
Other	58,291			56,595
TOTAL ASSETS	1,674,033			1,403,977
Accounts payable	119,583			90,577
Accrued liabilities and other	77,790			119,158
Debt	31,384			22,074
Reclamation	2,299			2,299
Current liabilities	242,533			234,108
Debt	411,042			253,427
Reclamation	142,456			136,975
Deferred tax liabilities	22,280			34,202
Other long-term liabilities	41,983			51,786
Non-current liabilities	617,761			476,390
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 256,928,852 issued and outstanding at September 30, 2021 and 243,751,283 at December 31, 2020	2,569			2,438
Additional paid-in capital	3,734,948			3,610,297
Accumulated deficit	(2,928,682)			(2,908,120)
Accumulated other comprehensive income (loss)	4,904			(11,136)
Stockholders' equity	813,739	$ 868,409	$ 720,506	693,479	$ 664,227	$ 653,857	$ 660,644	$ 667,004
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,674,033			1,403,977
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	5,176			12,727
Receivables	(58)			381
Ore on leach pads	0			0
Inventory	0			0
Prepaid expenses and other	11,621			20,872
Current assets	16,739			33,980
Property, plant and equipment, net	1,625			1,946
Mining properties, net	0			0
Ore on leach pads	0			0
Restricted assets	1,487
Equity securities	139,740
Marketable Securities, Noncurrent				12,943
Net investment in subsidiaries	606,776			514,705
Other	177,117			198,587
TOTAL ASSETS	943,484			763,643
Accounts payable	2,757			1,978
Accrued liabilities and other	9,680			36,183
Debt	0			0
Reclamation	0			0
Current liabilities	12,437			38,161
Debt	388,038			227,592
Reclamation	0			0
Deferred tax liabilities	293			100
Other long-term liabilities	3,344			3,629
Intercompany payable (receivable)	(274,366)			(199,318)
Non-current liabilities	117,309			32,003
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 256,928,852 issued and outstanding at September 30, 2021 and 243,751,283 at December 31, 2020	2,569			2,438
Additional paid-in capital	3,734,948			3,610,297
Accumulated deficit	(2,928,683)			(2,908,120)
Accumulated other comprehensive income (loss)	4,904			(11,136)
Stockholders' equity	813,738			693,479
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	943,484			763,643
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	29,719			28,515
Receivables	5,259			3,631
Ore on leach pads	74,803			74,866
Inventory	27,573			27,223
Prepaid expenses and other	1,009			1,375
Current assets	138,363			135,610
Property, plant and equipment, net	178,584			148,640
Mining properties, net	453,619			353,818
Ore on leach pads	78,302			81,963
Restricted assets	206
Equity securities	0
Marketable Securities, Noncurrent				0
Net investment in subsidiaries	60,813			72,785
Other	54,024			51,528
TOTAL ASSETS	963,911			844,550
Accounts payable	72,616			52,177
Accrued liabilities and other	40,561			46,023
Debt	24,107			14,506
Reclamation	1,584			1,584
Current liabilities	138,868			114,290
Debt	47,035			33,321
Reclamation	96,364			93,349
Deferred tax liabilities	7,522			8,457
Other long-term liabilities	22,740			29,916
Intercompany payable (receivable)	251,002			176,914
Non-current liabilities	424,663			341,957
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 256,928,852 issued and outstanding at September 30, 2021 and 243,751,283 at December 31, 2020	19,356			20,401
Additional paid-in capital	340,700			340,700
Accumulated deficit	40,324			27,202
Accumulated other comprehensive income (loss)	0			0
Stockholders' equity	400,380			388,303
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 963,911			$ 844,550