Supplemental Guarantor Information Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 65,319			$ 115,081
Receivables	37,295			29,744
Ore on leach pads	75,603			75,122
Inventory	57,478			66,279
Prepaid expenses and other	16,659			11,393
Assets held for sale				0
Current assets	252,354			297,619
Property, plant and equipment, net	308,774			298,451
Mining properties, net	928,078			971,567
Ore on leach pads	68,975			66,964
Restricted assets	8,248			12,133
Equity and debt securities	22,812			17,806
Receivables	27,580			31,151
Net investment in subsidiaries	0			0
Other	72,796			16,809
TOTAL ASSETS	1,689,617			1,712,500
Accounts payable	72,927			47,210
Accrued liabilities and other	117,606			82,619
Debt	21,939			24,937
Reclamation	6,552			6,552
Current liabilities	219,024			161,318
Debt	276,781			433,889
Reclamation	135,101			128,994
Deferred tax liabilities	51,534			79,070
Other long-term liabilities	76,370			56,717
Intercompany payable (receivable)	0			0
Non-current liabilities	539,786			698,670
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 240,508,936 issued and outstanding at September 30, 2019 and 203,310,443 at December 31, 2018	2,405			2,033
Additional paid-in capital	3,590,056			3,443,082
Accumulated deficit	(2,662,786)			(2,592,544)
Accumulated other comprehensive income (loss)	1,132			(59)
Stockholders' equity	930,807	$ 846,446	$ 832,335	852,512	$ 767,783	$ 818,771	$ 814,311	$ 814,977
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,689,617			1,712,500
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
Assets held for sale				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	(547,581)			(594,925)
Other	(297,343)			(288,228)
TOTAL ASSETS	(844,924)			(883,153)
Accounts payable	0			0
Accrued liabilities and other	0			0
Debt	0			0
Reclamation	0			0
Current liabilities	0			0
Debt	(297,343)			(288,228)
Reclamation	0			0
Deferred tax liabilities	0			0
Other long-term liabilities	0			0
Intercompany payable (receivable)	0			0
Non-current liabilities	(297,343)			(288,228)
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 240,508,936 issued and outstanding at September 30, 2019 and 203,310,443 at December 31, 2018	(234,709)			(234,030)
Additional paid-in capital	(2,249,806)			(2,208,375)
Accumulated deficit	1,936,934			1,847,480
Accumulated other comprehensive income (loss)	0			0
Stockholders' equity	(547,581)			(594,925)
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	(844,924)			(883,153)
Coeur Mining, Inc.
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	9,254			9,768
Receivables	(49)			5,333
Ore on leach pads	0			0
Inventory	0			0
Prepaid expenses and other	8,251			4,378
Assets held for sale				0
Current assets	17,456			19,479
Property, plant and equipment, net	2,448			2,755
Mining properties, net	4,753			4,753
Ore on leach pads	0			0
Restricted assets	1,460			4,872
Equity and debt securities	22,812			17,797
Receivables	0			0
Net investment in subsidiaries	547,518			594,584
Other	302,895			291,249
TOTAL ASSETS	899,342			935,489
Accounts payable	2,064			2,181
Accrued liabilities and other	10,265			22,274
Debt	0			0
Reclamation	0			0
Current liabilities	12,329			24,455
Debt	226,709			380,854
Reclamation	0			0
Deferred tax liabilities	(1,071)			218
Other long-term liabilities	4,356			2,465
Intercompany payable (receivable)	(273,788)			(325,014)
Non-current liabilities	(43,794)			58,523
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 240,508,936 issued and outstanding at September 30, 2019 and 203,310,443 at December 31, 2018	2,405			2,033
Additional paid-in capital	3,590,056			3,443,082
Accumulated deficit	(2,662,786)			(2,592,545)
Accumulated other comprehensive income (loss)	1,132			(59)
Stockholders' equity	930,807			852,511
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	899,342			935,489
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	8,547			25,518
Receivables	10,400			5,505
Ore on leach pads	75,603			75,122
Inventory	27,015			31,678
Prepaid expenses and other	1,077			1,846
Assets held for sale				0
Current assets	122,642			139,669
Property, plant and equipment, net	183,543			179,152
Mining properties, net	323,342			235,638
Ore on leach pads	68,975			66,964
Restricted assets	206			207
Equity and debt securities	0			9
Receivables	0			1,301
Net investment in subsidiaries	215			57
Other	54,584			11,619
TOTAL ASSETS	753,507			634,616
Accounts payable	27,642			19,244
Accrued liabilities and other	35,139			14,124
Debt	15,164			16,873
Reclamation	1,911			1,911
Current liabilities	79,856			52,152
Debt	35,233			36,377
Reclamation	90,144			84,092
Deferred tax liabilities	8,357			3,855
Other long-term liabilities	42,987			4,639
Intercompany payable (receivable)	256,539			303,084
Non-current liabilities	433,260			432,047
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 240,508,936 issued and outstanding at September 30, 2019 and 203,310,443 at December 31, 2018	20,309			19,630
Additional paid-in capital	242,987			164,506
Accumulated deficit	(22,905)			(33,719)
Accumulated other comprehensive income (loss)	0			0
Stockholders' equity	240,391			150,417
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	753,507			634,616
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	47,518			79,795
Receivables	26,944			18,906
Ore on leach pads	0			0
Inventory	30,463			34,601
Prepaid expenses and other	7,331			5,169
Assets held for sale				0
Current assets	112,256			138,471
Property, plant and equipment, net	122,783			116,544
Mining properties, net	599,983			731,176
Ore on leach pads	0			0
Restricted assets	6,582			7,054
Equity and debt securities	0			0
Receivables	27,580			29,850
Net investment in subsidiaries	(152)			284
Other	12,660			2,169
TOTAL ASSETS	881,692			1,025,548
Accounts payable	43,221			25,785
Accrued liabilities and other	72,202			46,221
Debt	6,775			8,064
Reclamation	4,641			4,641
Current liabilities	126,839			84,711
Debt	312,182			304,886
Reclamation	44,957			44,902
Deferred tax liabilities	44,248			74,997
Other long-term liabilities	29,027			49,613
Intercompany payable (receivable)	17,249			21,930
Non-current liabilities	447,663			496,328
Common stock, par value $0.01 per share; authorized 300,000,000 shares, 240,508,936 issued and outstanding at September 30, 2019 and 203,310,443 at December 31, 2018	214,400			214,400
Additional paid-in capital	2,006,819			2,043,869
Accumulated deficit	(1,914,029)			(1,813,760)
Accumulated other comprehensive income (loss)	0			0
Stockholders' equity	307,190			444,509
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 881,692			$ 1,025,548