Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 31, 2022	Jun. 30, 2021
Cover [Abstract]
Entity Registrant Name	UNITED STATES ANTIMONY CORPORATION
Entity Central Index Key	0000101538
Document Type	10-K/A
Amendment Flag	true
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Well Known Seasoned Issuer	No
Entity Small Business	true
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Document Period End Date	Dec. 31, 2021
Entity Filer Category	Non-accelerated Filer
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Entity Common Stock Shares Outstanding		106,240,361
Entity Public Float			$ 99,367,662
Entity File Number	001-08675
Document Annual Report	true
Document Transition Report	false
Entity Incorporation State Country Code	MT
Entity Tax Identification Number	81-0305822
Entity Interactive Data Current	Yes
Entity Address Address Line 1	P.O. Box 643
Entity Address City Or Town	Thompson Falls
Entity Address State Or Province	MT
City Area Code	406
Local Phone Number	827-3523
Security 12b Title	Common stock, $0.01 par value
Trading Symbol	UAMY
Security Exchange Name	NYSEAMER
Entity Address Postal Zip Code	59873
Auditor Name	Assure CPA, LLC
Auditor Location	Spokane, Washington
Auditor Firm Id	444
Amendment Description	We are filing this Amendment No. 1 on Form 10-K/A (“Amendment”) to amend our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, as filed with the Securities and Exchange Commission (“SEC”) on March 31, 2022 (“Form 10-K”).    The sole purpose of this amendment is to reflect final clerical changes to the document that were inadvertently omitted in the Form 10-K.   In addition, certain tables that did not present properly in the Form 10-K have been corrected.   The following final changes have been included in this amendment: Cover pageMarket capitalization at June 30, 2021Part II, Item 7Management’s Discussion and Analysis of Financial Condition and Results of OperationsPart II, Item 8Financial Statements, Note 10 Income Taxes (table only)Part III, Item 10Directors, Executive Officers, Promoters and Control Persons, Compliance with Section 16(a) of the Exchange ActPart III, Item 12Security Ownership of Certain Beneficial Owners and Management Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, this Form 10-K/A also contains new certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto. This Amendment does not reflect events occurring after the filing of the Form 10-K or modify or update any disclosures in the Form 10-K that may be affected by such events.