| Document And Entity Information | Nov. 30, 2021shares |
| Document Information [Line Items] | |
| Entity, Registrant Name | GoldMining Inc. |
| Document, Type | 40-F/A |
| Current Fiscal Year End Date | --11-30 |
| Document, Fiscal Period Focus | FY |
| Document, Fiscal Year Focus | 2021 |
| Document, Annual Report | true |
| Document, Period End Date | Nov. 30, 2021 |
| Entity, File Number | 001-39566 |
| Entity, Incorporation, State or Country Code | Z4 |
| Entity, Address, Address Line One | Suite 1830, 1030 West Georgia Street |
| Entity, Address, City or Town | Vancouver |
| Entity, Address, State or Province | BC |
| Entity, Address, Postal Zip Code | V6E 2Y3 |
| Entity, Address, Country | CA |
| City Area Code | 604 |
| Local Phone Number | 630-1000 |
| Title of 12(b) Security | Common shares |
| Trading Symbol | GLDG |
| Security Exchange Name | NYSEAMER |
| Entity, Common Stock Shares, Outstanding | 150,242,110 |
| Entity, Current Reporting Status | Yes |
| Entity, Interactive Data, Current | Yes |
| Entity, Emerging Growth Company | true |
| Entity, Ex Transition Period | false |
| ICFR Auditor Attestation Flag | false |
| Amendment Description | This Amendment No. 1 to the Annual Report on Form 40-F (“Amendment No. 1”) amends the Annual Report on Form 40-F of GoldMining Inc. (the “Company”) for the year ended November 30, 2021, which was originally filed with the U.S. Securities and Exchange Commission on February 28, 2022 (the “Original Report”). This Amendment No. 1 is being filed solely to include the qualified person consents from Robert E. Cameron, Joseph A. Kantor, Mauricio Castañeda, Porfirio Cabaleiro Rodriguez, and Leonardo de Moraes Soares, filed as exhibits 99.10 – 99.14, respectively, to this Amendment No. 1. Other than as discussed above and expressly set forth herein, this Amendment No. 1 does not, and does not purport to, amend or restate any other information contained in the Original Report nor does this Amendment No. 1 reflect any events that have occurred after the Original Report was filed. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Report. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, this Amendment No. 1 also includes as exhibits the certifications of the Principal Executive Officer and Principal Financial Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. As no financial statements have been included in this Amendment No. 1 and this Amendment No. 1 does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K (or the equivalent disclosure requirement in Form 40-F), paragraphs 3, 4, and 5 have been omitted from such certifications. The Company is not including certifications pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) as no financial statements are being filed with this Amendment No. 1. |
| Amendment Flag | true |
| Entity, Central Index Key | 0001538847 |
| Document Registration Statement | false |
| Annual Information Form | true |
| Audited Annual Financial Statements | true |
| Business Contact [Member] | |
| Document Information [Line Items] | |
| Entity, Address, Address Line One | 28 Liberty Street |
| Entity, Address, City or Town | New York |
| Entity, Address, State or Province | NY |
| Entity, Address, Postal Zip Code | 10005 |
| City Area Code | 212 |
| Local Phone Number | 894-8940 |
| Contact Personnel Name | C T Corporation System |
