Supplemental Guarantor Information Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 77,148			$ 55,645
Receivables	22,490			18,666
Ore on leach pads	72,326			66,192
Inventory	46,978			55,886
Prepaid expenses and other	20,285			14,047
Current assets	239,227			210,436
Property, plant and equipment, net	226,115			248,789
Mining properties, net	708,744			711,955
Ore on leach pads	87,420			71,539
Restricted assets	8,819			8,752
Equity and debt securities	19,862			35,646
Receivables	23,493			28,709
Net investment in subsidiaries	0			0
Other	57,466			62,810
TOTAL ASSETS	1,371,146			1,378,636
Accounts payable	71,461			69,176
Accrued liabilities and other	107,990			95,616
Debt	23,265			22,746
Reclamation	3,094			3,114
Current liabilities	205,810			190,652
Debt	277,873			272,751
Reclamation	139,608			133,417
Deferred tax liabilities	30,947			41,976
Other long-term liabilities	52,681			72,836
Intercompany payable (receivable)	0			0
Non-current liabilities	501,109			520,980
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,744,601 issued and outstanding at September 30, 2020 and 241,529,021 at December 31, 2019	2,437			2,415
Additional paid-in capital	3,608,102			3,598,472
Accumulated deficit	(2,920,000)			(2,933,747)
Accumulated other comprehensive income (loss)	(26,312)			(136)
Stockholders' equity	664,227	$ 653,857	$ 660,644	667,004	$ 930,807	$ 846,446	$ 832,335	$ 852,512
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,371,146			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 and debt securities	0			0
Receivables	0			0
Net investment in subsidiaries	(477,284)			(325,738)
Other	(230,487)			(277,448)
TOTAL ASSETS	(707,771)			(603,186)
Accounts payable	0			0
Accrued liabilities and other	0			0
Debt	0			0
Reclamation	0			0
Current liabilities	0			0
Debt	(230,487)			(277,448)
Reclamation	0			0
Deferred tax liabilities	0			0
Other long-term liabilities	0			0
Intercompany payable (receivable)	0			0
Non-current liabilities	(230,487)			(277,448)
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,744,601 issued and outstanding at September 30, 2020 and 241,529,021 at December 31, 2019	(235,217)			(236,101)
Additional paid-in capital	(2,393,931)			(2,298,162)
Accumulated deficit	2,151,864			2,208,525
Accumulated other comprehensive income (loss)	0			0
Stockholders' equity	(477,284)			(325,738)
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	(707,771)			(603,186)
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	13,702			2,985
Receivables	(43)			(65)
Ore on leach pads	0			0
Inventory	0			0
Prepaid expenses and other	13,313			6,202
Current assets	26,972			9,122
Property, plant and equipment, net	2,045			2,370
Mining properties, net	0			4,452
Ore on leach pads	0			0
Restricted assets	1,474			1,470
Equity and debt securities	19,862			35,646
Receivables	0			0
Net investment in subsidiaries	476,547			325,723
Other	234,363			267,281
TOTAL ASSETS	761,263			646,064
Accounts payable	3,622			1,277
Accrued liabilities and other	45,787			9,036
Debt	0			0
Reclamation	0			0
Current liabilities	49,409			10,313
Debt	247,415			226,885
Reclamation	0			0
Deferred tax liabilities	113			50
Other long-term liabilities	3,543			4,225
Intercompany payable (receivable)	(203,444)			(262,413)
Non-current liabilities	47,627			(31,253)
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,744,601 issued and outstanding at September 30, 2020 and 241,529,021 at December 31, 2019	2,437			2,415
Additional paid-in capital	3,608,102			3,598,472
Accumulated deficit	(2,920,000)			(2,933,747)
Accumulated other comprehensive income (loss)	(26,312)			(136)
Stockholders' equity	664,227			667,004
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	761,263			646,064
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	12,359			27,217
Receivables	7,150			5,978
Ore on leach pads	72,326			66,192
Inventory	23,103			24,763
Prepaid expenses and other	1,218			1,192
Current assets	116,156			125,342
Property, plant and equipment, net	149,088			167,159
Mining properties, net	339,067			327,685
Ore on leach pads	87,420			71,539
Restricted assets	206			206
Equity and debt securities	0			0
Receivables	0			0
Net investment in subsidiaries	75,497			85,755
Other	50,949			52,040
TOTAL ASSETS	818,383			829,726
Accounts payable	37,662			26,211
Accrued liabilities and other	39,482			35,547
Debt	15,823			15,347
Reclamation	1,628			1,628
Current liabilities	94,595			78,733
Debt	32,876			32,989
Reclamation	95,187			91,524
Deferred tax liabilities	8,190			8,104
Other long-term liabilities	31,347			40,012
Intercompany payable (receivable)	182,672			246,186
Non-current liabilities	350,272			418,815
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,744,601 issued and outstanding at September 30, 2020 and 241,529,021 at December 31, 2019	20,401			20,309
Additional paid-in capital	340,700			337,975
Accumulated deficit	12,415			(26,106)
Accumulated other comprehensive income (loss)	0			0
Stockholders' equity	373,516			332,178
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	818,383			829,726
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	51,087			25,443
Receivables	15,383			12,753
Ore on leach pads	0			0
Inventory	23,875			31,123
Prepaid expenses and other	5,754			6,653
Current assets	96,099			75,972
Property, plant and equipment, net	74,982			79,260
Mining properties, net	369,677			379,818
Ore on leach pads	0			0
Restricted assets	7,139			7,076
Equity and debt securities	0			0
Receivables	23,493			28,709
Net investment in subsidiaries	(74,760)			(85,740)
Other	2,641			20,937
TOTAL ASSETS	499,271			506,032
Accounts payable	30,177			41,688
Accrued liabilities and other	22,721			51,033
Debt	7,442			7,399
Reclamation	1,466			1,486
Current liabilities	61,806			101,606
Debt	228,069			290,325
Reclamation	44,421			41,893
Deferred tax liabilities	22,644			33,822
Other long-term liabilities	17,791			28,599
Intercompany payable (receivable)	20,772			16,227
Non-current liabilities	333,697			410,866
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 243,744,601 issued and outstanding at September 30, 2020 and 241,529,021 at December 31, 2019	214,816			215,792
Additional paid-in capital	2,053,231			1,960,187
Accumulated deficit	(2,164,279)			(2,182,419)
Accumulated other comprehensive income (loss)	0			0
Stockholders' equity	103,768			(6,440)
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 499,271			$ 506,032