# EDGAR Filing Document

**Accession Number:** 0000863064
**File Stem:** 0001193125-26-138080
**Filing Date:** 2026-4
**Character Count:** 9819
**Document Hash:** 3deca46996ba015b2122f60ef885707f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-138080.hdr.sgml**: 20260401

**ACCESSION NUMBER**: 0001193125-26-138080

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260401

**DATE AS OF CHANGE**: 20260401

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Western Copper & Gold Corp
- **CENTRAL INDEX KEY:** 0001364125
- **STANDARD INDUSTRIAL CLASSIFICATION:** METAL MINING [1000]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** A1
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-83625
- **FILM NUMBER:** 26828992

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** SUITE 907- 1030 WEST GEORGIA STREET
- **CITY:** VANCOUVER
- **PROVINCE COUNTRY:** A1
- **ZIP:** V6E 2Y3
- **BUSINESS PHONE:** 6046849497

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** SUITE 907- 1030 WEST GEORGIA STREET
- **CITY:** VANCOUVER
- **PROVINCE COUNTRY:** A1
- **ZIP:** V6E 2Y3

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Western Copper CORP
- **DATE OF NAME CHANGE:** 20060525
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** RIO TINTO PLC
- **CENTRAL INDEX KEY:** 0000863064
- **STANDARD INDUSTRIAL CLASSIFICATION:** METAL MINING [1000]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** X0
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** 6 ST JAMES'S SQUARE
- **CITY:** LONDON, SW1Y 4AD
- **STATE:** X0
- **ZIP:** 00000
- **BUSINESS PHONE:** 801-204-8000

**MAIL ADDRESS:**
- **STREET 1:** RIO TINTO SERVICES INC.
- **STREET 2:** 80 STATE STREET
- **CITY:** ALBANY
- **STATE:** NY
- **ZIP:** 12207-2543

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** RTZ CORPORATION PLC
- **DATE OF NAME CHANGE:** 19950522

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 4)**

**Western Copper and Gold Corporation**

*(Name of Issuer)*

**Common Shares, without par value**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Andy Hodges, Company Secretary**<br>Rio Tinto plc<br>6 St James's Square<br>London X0 SW1Y 4AD<br>44 (0) 20 7781 2000

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**03/26/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Rio Tinto plc** | Name of reporting person<br>**Rio Tinto plc** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X0** | Citizenship or place of organization<br>**X0** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**19004925.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**19004925.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**19004925.00** | Aggregate amount beneficially owned by each reporting person<br>**19004925.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**8.42%** | Percent of class represented by amount in Row (11)<br>**8.42%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** For rows 8, 10, 11 and 13, see Item 5.

For row 13, the calculation is based on 225,628,684 common shares, without par value (the "Shares"), being the number of Shares outstanding as of March 25, 2026, as disclosed in the Company's Annual Information Form for the year ended December 31, 2025.

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Rio Tinto Canada Inc.** | Name of reporting person<br>**Rio Tinto Canada Inc.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**ISRAEL** | Citizenship or place of organization<br>**ISRAEL** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**19004925.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**19004925.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**19004925.00** | Aggregate amount beneficially owned by each reporting person<br>**19004925.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**8.42%** | Percent of class represented by amount in Row (11)<br>**8.42%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** For rows 8, 10, 11 and 13, see Item 5.

For row 13, the calculation is based on 225,628,684 common shares, without par value (the "Shares"), being the number of Shares outstanding as of March 25, 2026, as disclosed in the Company's Annual Information Form for the year ended December 31,2025.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Shares, without par value

**(b) Name of Issuer:**
Western Copper and Gold Corporation

**(c) Address of Issuer's Principal Executive Offices:**
Suite 907 - 1030 West Georgia Street, Vancouver, A1, V6E 2Y3

This Amendment No. 4 ("Amendment No. 4") relates to the Statement on Schedule 13D (this "Schedule 13D") filed on April 1, 2026 by Rio Tinto plc, a public limited company incorporated under the laws of England and Wales ("Rio Tinto"), and Rio Tinto Canada Inc., a corporation incorporated under the laws of Canada ("RTCI" and, together with Rio Tinto, the "Rio Tinto Companies").  Except as otherwise provided herein, each item of the Original Schedule 13D remains unchanged.

Explanatory Note: This Amendment No. 4 is being filed to reflect a passive decrease of greater than one percent (1%) in the percentage of the Company's Common Shares owned beneficially by the Reporting Persons based on the Company's disclosure of the number of Common Shares outstanding.

**Item 4. Purpose of Transaction**

Item 4 of the Original Schedule 13D is hereby amended and supplemented by adding the following information:

The Company discloses the number of its issued and outstanding Common Shares on a quarterly basis.  On March 26, 2026, the Company filed its Form 40-F with the Securities and Exchange Commission including as an Exhibit the Company's Annual Information Form for the year ended Dember 31, 2025.  The Annual Information Form disclosed on page 26 that "[a]s of March 25, 2026, the Company had 225,628,684 Common Shares issued and outstanding."

**Item 5. Interest in Securities of the Issuer**

**(a)**
—

**(b)**
—

**(c)**
Item 5 of the Original Schedule 13D is hereby amended and supplemented by adding the following information:

The information set forth in Item 4 of this Amendment No. 4 is incorporated by reference in its entirety into this Item 5.  There were no other transactions by the reporting persons that were effected during the past 60 days.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Rio Tinto plc

**Signature:** /s/Andy Hodges

**Name/Title:** Andy Hodges, Company Secretary

**Date:** 04/01/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Rio Tinto Canada Inc.

**Signature:** /s/Julie Parent

**Name/Title:** Julie Parent, Director

**Date:** 04/01/2026