Acquisitions - Purchase Price Allocation (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended				9 Months Ended
		Feb. 14, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Sep. 30, 2025	Dec. 31, 2024
Assets:
Short-term receivables			$ 23,292				$ 23,292
LIABILITIES
Goodwill			$ 632,380				$ 632,380	$ 0
Common stock, shares issued (in shares)			642,210,145				642,210,145	399,235,632
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period							3,248,192
Common Stock
LIABILITIES
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			46,000	2,139,000
Common Stock | Royalty Settlement [Domain]
LIABILITIES
Common stock issued for investment (in shares)					595,000	738,000
SilverCrest
Business Combination [Line Items]
Common shares issued (value)		$ 1,580,000	$ 1,581,983
Fair value of replacement stock-based compensation awarded(1)	[1]		8,539
Fair value of Coeur payable to SilverCrest repurchased			72,311
Total purchase price			1,518,211
Assets:
Cash and cash equivalents			103,724				$ 103,724
Inventory			153,826				153,826
Prepaid expenses and other			15,213				15,213
Property, plant and equipment and mining properties			1,006,736				1,006,736
Other			5,596				5,596
Total Assets			1,308,387				1,308,387
LIABILITIES
Accounts payable			16,774				16,774
Accrued liabilities and other			25,636				25,636
Debt			846				846
Reclamation			8,644				8,644
Deferred tax liabilities	[2]		350,218				350,218
Other long-term liabilities			20,438				20,438
Total liabilities			422,556				422,556
Net assets acquired			885,831				885,831
Goodwill			632,380				632,380
Net assets acquired			$ 1,518,211				$ 1,518,211
Common stock, shares issued (in shares)		239,331,799	239,331,799				239,331,799
Shares issued (in dollars per share)			$ 6.61				$ 6.61
SilverCrest | Common Stock | SilverCrest Acquisition
LIABILITIES
Common stock issued for investment (in shares)							2,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period							3,200,000

[1] As of September 30, 2025, 2.3 million common shares were issued related to the exercise of 3.2 million replacement options.

[2] Deferred income tax liabilities represent the future tax expense associated with the differences between the preliminary fair value allocated to assets (excluding goodwill) and liabilities and a tax basis increase to the preliminary fair value of the assets acquired in Mexico and the historical carryover tax basis of assets and liabilities in all other jurisdictions. No deferred tax liability is recognized for the basis difference inherent in the preliminary fair value allocated to goodwill.