Announcement • Aug 15
London BTC Company Limited Reports High-Grade Antimony Discovery Near Black Star Gold-Silver Project in Nevada
London BTC Company Limited announced that high-grade Antimony ("Sb") has been recorded only 120 metres south of the Company's Black Star Gold-Silver Project (the "Project" or "Black Star") in Nevada, USA and the Company is excited and optimistic that Antimony may also have the potential to be present on its Black Star mineral claims. On 15 July 2026, the Company announced a gold discovery in Nevada with surface sampling reporting grades up to 16.23 g/t (0.52 oz/t Au) and 50.5 g/t silver (1.62 oz/t Ag). It has now been determined that the gold and silver mineralisation at Black Star sits within the same trending mineralised corridor as reported Antimony mineralisation immediately to the south of the Company's mineral claims. Detailed research by the Company's geological team has identified key and important historical data highlighting the area's potential for hosting high-grade of Antimony discoveries. Antimony is designated as a critical mineral in the United States, reflecting its importance to U.S. economic and national security and the vulnerability of its supply chain. Antimony also has important defense applications, including its use in ammunition and other military systems. A review of USGS and NBMG archive data has identified historical data proximal to the intrusion-related Black Star system grading greater than 1% Antimony (>10,000 ppm Sb). The result exceeded the upper limit of the analytical method used, and the true Antimony grade is unknown (USGS, MRDS, 1985). Antimony is designated a critical and strategic mineral by the United States Government. The USGS reports that the United States remain substantially import-reliant for Antimony, and that Antimony is one of the minerals subject to Chinese export restrictions on shipments to the United States (USGS, 2025). The US government has committed to a USD 12 billion stockpile to establish an inventory from critical and strategic mineral projects, including USD 10 billion in funding from the US Export-Import Bank (EXIM) and a further USD 2 billion in private funding (Reuters, 2026). Gold projects carrying an Antimony credit are attracting significant strategic capital in the United States. In May 2026 EXIM approved a USD 2,900 million senior secured loan for Perpetua Resources' Stibnite Gold Project in Idaho, a gold-Antimony development (Perpetua Resources, 2026). Recent engagement with Dahrouge Geological Consulting allows for immediate access to experienced field personnel for further sampling, geological mapping and technical assessment. The Black Star project consists of 36 mineral claims over 744 acres (3 km2) in Pershing County, Nevada. Approximately 60 miles (96 km) from the Company's Huntington-Whitman Project and 73 miles (117 km) from its Amonett-Frank Project. The Antimony-bearing sample lies approximately 120 m south of the Black Star claims and within the same structural corridor that returned 16.23 g/t Au and 50.5 g/t Ag from the Company's 2026 due diligence rock chip programme conducted by Schiehallion Consulting. Economic Sb is a recognised part of hydrothermal Au-Ag systems in the USA. The value and potential of these projects are demonstrated by the Meadow Creek region of Idaho, which represents a domestic development for the economic extraction of Gold and Antimony. The historical sample also returned 2% copper, 700 ppm silver, 1,000 ppm arsenic, 1,000 ppm bismuth and 700 ppm lead. The contact is targeted by shafts, adits and prospect pits. A review of government databases, technical literature and historical company reports identified limited follow-up exploration since the 1980s (USGS, MRDS Records). Historical sampling at Black Star was undertaken by the Nevada Bureau of Mines and Geology in June 1985 as part of a regional mineral inventory of the Sonoma-Gerlach Resource Area (USGS, MRDS, 1985) and is captured in the USGS Mineral Resource Data System. Three rock samples were collected across the historical workings, sample IDs: 2928, 2929, and 2930. These samples were analysed by semi-quantitative emission spectrography, with gold determined by atomic absorption. Recorded results from the historical samples are set out below: Element Sample 2928 Sample 2929 Sample 2930 Unit Gold (Au) 9.0 7.0 1.5 ppm Silver (Ag) 27 700 ppm Antimony (Sb) No Data No Data >10,000 ppm Copper (Cu) 150 700 20,000 ppm Arsenic (As) 300 500 1,000 ppm Bismuth (Bi) 500 700 1,000 ppm Lead (Pb) 30 50 700 ppm Zinc (Zn) n.r. n.r. 300 ppm Cadmium (Cd) n.r. n.r. 50 ppm. "No Data" indicates that Antimony was not reported; this does not indicate that the element is absent. The Antimony result for sample 2930 was reported as exceeding the method's upper determination limit. Conducted as part of the Company's wider portfolio expansion strategy, the Company's geological consultant, Schiehallion Consulting, completed due diligence over the Black Star Project in June 2026. Further geological interpretation at this stage requires confirmation of local Antimony grade and an understanding of geological and geochemical setting. Sampling of Au-Ag-Sb mineralisation will be a priority for the Company. This field programme will be immediately followed by updated assay information, further information on the geological setting and insight into the economic relevance of mineralisation. If recoverable, multi-element re-assay of sample material from the Company's 2026 rock chip programme to include Antimony. Comprehensive rock chip sampling of the 2.5 km corridor between target zones, clustering around quartz networks and zones of alteration. All samples to be assayed for Au-Ag-Sb. Rock chip sampling programme extended to the South-East to target mineralisation trending from the historical Au-Ag-Sb recorded sample site onto the Company's mineral claims. Geological mapping to define the structural setting and economic significance of the separate components of the mineral system, focus on intrusion-hydrothermal relationships. Compilation of geoscientific data to assist in the understanding of the local geology, alteration and structural setting and to provide drill-ready targets. Progression of further gold and silver project staking in Nevada and Arizona, in line with the Company's previously announced phased strategy.
