Supplemental Guarantor Information Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Receivables	$ 22,867		$ 23,484
Ore on leach pads	81,773		74,866
Inventory	54,471		51,210
Prepaid expenses and other	20,949		27,254
Current assets	304,135		269,608
Property, plant and equipment, net	272,558		230,139
Equity securities			12,943
Other	60,847		56,595
TOTAL ASSETS	1,708,008		1,403,977
Accounts payable	107,362		90,577
Accrued liabilities and other	89,311		119,158
Debt	28,876		22,074
Reclamation	2,299		2,299
Current liabilities	227,848		234,108
Debt	385,370		253,427
Reclamation	140,936		136,975
Deferred tax liabilities	39,598		34,202
Other long-term liabilities	45,847		51,786
Non-current liabilities	611,751		476,390
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 257,046,847 issued and outstanding at June 30, 2021 and 243,751,283 at December 31, 2020	2,570		2,438
Additional paid-in capital	3,732,296		3,610,297
Accumulated deficit	(2,873,914)		(2,908,120)
Accumulated other comprehensive income (loss)	7,457		(11,136)
Stockholders' equity	868,409	$ 720,506	693,479	$ 653,857	$ 660,644	$ 667,004
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,708,008		1,403,977
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	10,609		12,727
Receivables	371		381
Ore on leach pads	0		0
Inventory	0		0
Prepaid expenses and other	15,177		20,872
Current assets	26,157		33,980
Property, plant and equipment, net	2,011		1,946
Mining properties, net	0		0
Ore on leach pads	0		0
Restricted assets	1,489		1,482
Equity securities	174,370		12,943
Net investment in subsidiaries	602,617		514,705
Other	201,420		198,587
TOTAL ASSETS	1,008,064		763,643
Accounts payable	4,256		1,978
Accrued liabilities and other	22,267		36,183
Debt	0		0
Reclamation	0		0
Current liabilities	26,523		38,161
Debt	367,804		227,592
Reclamation	0		0
Deferred tax liabilities	5,345		100
Other long-term liabilities	3,569		3,629
Intercompany payable (receivable)	(263,586)		(199,318)
Non-current liabilities	113,132		32,003
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 257,046,847 issued and outstanding at June 30, 2021 and 243,751,283 at December 31, 2020	2,570		2,438
Additional paid-in capital	3,732,296		3,610,297
Accumulated deficit	(2,873,914)		(2,908,120)
Accumulated other comprehensive income (loss)	7,457		(11,136)
Stockholders' equity	868,409		693,479
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,008,064		763,643
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	42,809		28,515
Receivables	6,337		3,631
Ore on leach pads	81,773		74,866
Inventory	30,214		27,223
Prepaid expenses and other	937		1,375
Current assets	162,070		135,610
Property, plant and equipment, net	168,054		148,640
Mining properties, net	410,124		353,818
Ore on leach pads	73,487		81,963
Restricted assets	206		206
Equity securities	0		0
Net investment in subsidiaries	64,010		72,785
Other	54,738		51,528
TOTAL ASSETS	932,689		844,550
Accounts payable	62,127		52,177
Accrued liabilities and other	43,690		46,023
Debt	21,037		14,506
Reclamation	1,584		1,584
Current liabilities	128,438		114,290
Debt	36,567		33,321
Reclamation	95,687		93,349
Deferred tax liabilities	8,630		8,457
Other long-term liabilities	25,070		29,916
Intercompany payable (receivable)	240,016		176,914
Non-current liabilities	405,970		341,957
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 257,046,847 issued and outstanding at June 30, 2021 and 243,751,283 at December 31, 2020	19,356		20,401
Additional paid-in capital	340,700		340,700
Accumulated deficit	38,225		27,202
Accumulated other comprehensive income (loss)	0		0
Stockholders' equity	398,281		388,303
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 932,689		$ 844,550