Simberi Metallurgical Testwork Proceeding Following Drilling Completion

By: PNG Business News March 03, 2024

Figure 1. Simberi Island Site Layout within Mining Lease


  • Assays received for the final four metallurgical diamond drill holes of the 14-hole, 1,856-metre program completed in January (refer ASX release Simberi Resource Definition Drilling Update January 23, 2024) including:
    • SDH520: 28.6 m @ 1.4 g/t Au from 96.4 m;
    • SDH522: 60 m @ 2.6 g/t Au from 118m, including 4 m @ 10.3 g/t Au from 119 m, and 12 m @ 4.0 g/t Au from 140 m;
    • SDH527: 31 m @ 1.1 g/t Au from 0 m;
    • SDH528: 8 m @ 6.1 g/t Au from 0 m, including 2 m @ 13.4 g/t Au from 2 m.
  • Sample material derived from the initial 10 holes has arrived in Canada for metallurgical testwork focused on three primary objectives:
    • Resolve assumptions for Sorowar ore competency which was previously classified as “medium” when all other ore types were classified as “extremely soft” which has a significant impact on the capacity of any grinding circuit design,
    • Determine whether lower flotation mass recovery can be achieved than indicated in previous testwork to better scale the flotation circuit without adversely impacting gold recovery, and
    • Test potential of ultra-fine grinding and leaching of concentrate to deliver a more capital efficient project design with attractive recovery outcomes.
  • The second and final batch of sample material is now in transit from Simberi to Canada which provides the sample mass requirements and grade variability ranges for the full testwork program.

St Barbara Limited is pleased to announce that all assay results have been returned for the 14-hole, 1846-metre metallurgical diamond drill program at the Simberi Operations in Papua New Guinea (PNG). This has allowed the collection and dispatch of 2,434kg of sulphide ore for the planned comprehensive metallurgical testwork program in Canada.

Managing Director and CEO Andrew Strelein said “The receipt of remaining assay results for the metallurgical diamond drill program is another important milestone for the 2023/24 campaign. This has allowed the finalisation of the second batch of sample material now in transit to the selected laboratory in Canada.” Assay results for all 14 metallurgical diamond drill holes is set out below in Table 1.

Figure 1 below shows the location of the respective open pits on the main mining lease (ML 156) and Figure 2 shows the locations of the planned and completed diamond drill holes including both resource definition and metallurgical sample holes.


The offical press release, figures and tables can be found HERE

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