Exploration Update

• Antimony is listed as a critical mineral by the U.S. Department of Interior as it is used in a wide variety of military, energy, industrial and consumer applications
  
• USA has no domestic primary mined source of Antimony and China has announced it will cut off the global supply of antimony from 15 September 2024
• Locksley’s Exploration team has been mobilised to follow-up on the high-grade Desert Antimony Mine results in the North Block at the Mojave Project
  • The Desert Antimony Mine returned rock chip samples as high as 11.2% & 8.33% Antimony (Sb)
• High-grade antimony is represented by historic underground mine workings on quartz-stibnite (Sb2S3) veins
• Mindat.org outlines historic production ranged from 100 to 1,000 tons with grades ranging from 15 to 20% Sb at the Desert Antimony Mine
• Additionally, a sample to the south-east of the Desert Antimony Mine assayed at 4.12% Cu

Locksley Resources Limited (ASX:LKY) is pleased to announce results of a holistic review of mineral potential outside of the known high-grade REE mineralisation within the Mojave Project, California. 

The holistic review identified six (6) rock chip samples grading >0.5% Sb, including two samples grading 11.2% Sb and 8.3% Sb. The samples had been collected from the historic Desert Antimony Mine, located on the North blocks, during reconnaissance sampling for REEs. In addition, four (4) samples returned copper >0.5%, including one sample assaying 4.12% Cu to the south-east of the Desert Antimony Mine. Over the last 12 months, Locksley Resources have completed three surface sampling programs at the Mojave Project, CA, located 45 minutes from Las Vegas. A total of 223 rock chip samples and 43 stream sediment samples have been collected throughout the Mojave Project’s El Campo Lease, North Block, North-East Block, and South Block. Given the proximity of the Mountain Pass REE Mine rare-earth elements (REE) have been the main focus of exploration during these programs. As part of a holistic multi-commodity review, the Company has revealed significant antimony and copper mineralisation at the Mojave Project. The high-grade antimony is represented by historic underground mine workings on quartz-stibnite (Sb2S3) veins, whilst the copper anomalism has a gold-silver-bismuth association suggesting of a felsic intrusive related source.

From the 223 rockchip samples, six samples returned antinomy grades of above 0.8% Sb. Two samples returned assay results of 1.3% and 1.4% Sb, while the best grades returned two rockchip samples at:

• 11.2% Sb

• 8.33% Sb

These samples were all located near a historic antimony mine located in the northern portion of the North Block. See Figure 1 & 2.

Mindat.org refers to the historic workings as the ‘Desert Antimony Mine’, located in the Clark Mountain District, San Bernadino County, CA. Reference is made to the antimony mineralisation being hosted within a granite with an ore body striking N20E and dipping 75W with a width of 1.22m. Local geology includes Precambrian units, undivided, unit 2 (Mojave Desert and Transverse Ranes) and/or Quaternary alluvium and marine deposits. The extent of the ore body is unknown. www.locksleyresources.com.au According to mindat.org production ranged from 100 to 1,000 tons with grades ranging from 15 to 20% Sb. Figure 1 highlights the two rock chips returning 11.2% and 8.33% Sb.

The strike of historic workings at the Desert Antimony Mine is 230m south-west - north-east, open along strike and to the company’s knowledge has not been drilled. Observations onsite suggest that there may be multiple parallel quartz stibnite-veins that have been mined from underground and opens the possibility of additional sub-parallel mineralised veins.

Locksley Resources Limited Managing Director, Steve Woodham commented:

"A holistic review of Locksley’s Mojave Project highlighted reconnaissance rock-chip sampling at the North Block returned four significant antimony results greater than half a percent including 8.33% & 11.2% Sb, the samples came from an historic antimony mine developed on high-grade quartz-stibnite veining. Given the critical importance of Antimony as a critical mineral1 and recent tightening of supply with export restrictions from the world’s biggest producer (China 32% of world supply) Locksley has mobilised the exploration team to conduct a follow-up sampling program to evaluate the potential of the known antimony mineralisation. The Board look forward to reporting the results of the upcoming Antimony program as soon as practicable." 

View the full announcement here.

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