J2 Metals to Acquire Sierra Metals’ Silver-Antimony Project

Canada-based J2 Metals has entered into a three-year option agreement with Impact Silver to acquire the Sierra Plata Project in Guerrero. The project is expected to benefit from higher silver prices and by its potential to extract antimony, a critical mineral for the defense and microchip industries.

The agreement grants J2 Metals the option to potentially acquire a 100% interest in the 2,200h property located in the Zacualpan District. The company considers that the projects hold potential for antimony exploitation amid global supply constraints for the critical mineral.

J2 Metals highlights that the Sierra Plata project hosts five past-producing silver mines, including El Salto and El Sabino, as well as numerous smaller historic workings. The company reports that the historic San Miguel silver mine, a multi-level operation active until 1931, is understood to extend from adjacent claims held by Grupo México into the Sierra Plata project area.

Geologically, the project is prospective for both silver and antimony. Historic grab samples from the San Miguel area reportedly assayed up to 414g/t silver and 0.447g/t gold, featuring quartz-hosted argentite with galena and pyrite. 

The historically exploited vein is approximately 40cm wide. In addition to silver, J2 Metals noted the project’s exposure to antimony, a metal designated as critical by jurisdictions such as the United States and the European Union. The property is adjacent to a large, fine-grained, manto-style stibnite occurrence where samples reportedly returned values greater than 10,000ppm antimony. Elevated antimony values have been identified within the Sierra Plata boundaries along structural trends extending from this occurrence.

Thomas Lamb, CEO, J2 Metals, stated that the deal leverages the fact that certain concessions require regular investment under Mexican regulations, and Sierra Plata falls outside Impact Silver's current production focus. “Through this agreement, we expect to benefit from Impact’s experienced local technical teams, established infrastructure, and strong community relationships. The region also hosts several nearby processing facilities, including those operated by Impact, which could provide valuable optionality should Sierra Plata advance toward production of silver and antimony,” he added.

Graham Giles, Vice President of Exploration, J2 Metals, noted that approximately 50% of the property has been mapped and that satellite surveys have identified argillic alteration potentially indicating the upper portions of an epithermal system. “This interpretation is supported by elevated mercury, antimony, and arsenic values, suggesting the potential for higher-grade mineralization at depth. In addition to the five historic silver mines within the project, there are numerous historic workings that remain largely untested,” he added.

Transaction Terms

Under the terms of the agreement, Impact Silver has granted J2 Metals the option to acquire 100% of the project subject to specific financial and operational milestones over three years. J2 Metals will issue subscription receipts valued at CA$250,000 (US$182,323) within three  business days of TSX Venture Exchange (TSXV) approval. These receipts will exchange into shares four months after the effective date of Dec. 19, 2025.

By the end of Year 1, J2 Metals must complete work commitments of at least MXN$1,805 (US$100.65)/ha and issue consideration equal to the greater of 1.5 million common shares or CA$75,000. By Year 2, work commitments of CA$400,000 are required, alongside consideration equal to the greater of 2 million shares or CA$125,000. By Year 3, work commitments of CA$650,000 are required, alongside consideration equal to the greater of 3 million shares or CA$175,000.

Impact Silver will retain a 1.5% net smelter returns (NSR) royalty on production. J2 Metals holds the right to purchase 50% of this royalty, reducing it to 0.75%, for CA$1.5 million at any time. J2 Metals may also accelerate the acquisition by fulfilling the payments and work commitments early, plus an additional payment of CA$500,000.

Antimony’s Importance

J2 Metals' dual strategy comes amidst trade tensions between the United States and China regarding critical minerals, including antimony. On Nov. 9, 2025, China rolled back a number of restrictions on its export of critical minerals and rare earth materials to the United States. The suspended restrictions include limits on the export of certain rare earth elements, lithium battery materials, and processing technologies. Beijing also reversed retaliatory curbs on exports of gallium, germanium, antimony, and other super-hard materials such as synthetic diamonds and boron nitrides. These measures, introduced in December 2024, were widely seen as retaliation for the United States’ expanded semiconductor export restrictions. China classifies such materials as dual-use items, meaning they can be used for both civilian and military purposes.

While the restrictions were lifted, they underscored the vulnerability of supply chains, as China controls over 75% of the world’s antimony. It served as the United States’ second-largest source of raw antimony ores, supplying 23%, and its largest source of refined antimony metal and oxides, accounting for 63% of all US imports, as reported by MBN.