- High grade copper assays returned from Trident Project in NSW with rock chip samples up to 17.60% Cu recorded
- Up to 1.275g/t Au recorded from the same area as highly anomalous copper results
- Multiple tin results greater than 1% received in several samples with up to 2.44% tin also recorded
- Coupled with the high tin results are highly anomalous niobium, tantalum and rubidium grading up to 1080ppm, 676ppm and 3080ppm respectively
- Initial exploration suggests pegmatites appear to be NYF (niobium-yttrium-fluorine) and not LCT (lithium-caesium-tantalum) pegmatites
- Numerous areas of high-grade copper and gold to be followed up on the next sampling program as a matter of priority
- Selective samples will be assayed for Rare Earth Elements (‘REE’) analysis to ascertain rare earth occurrences
- Positive copper and gold assays confirm the potential for IOCG mineralisation at Trident
Commenting on results from the Trident sampling program, CEO Simon Phillips said:
“We are pleased with these early results from our sampling at Trident which confirm the highly prospective multi element nature of the project. We are very encouraged by the strong copper, gold and tin mineralisation identified. The Trident Project remains significantly underexplored and we believe we are only scratching the surface in terms of the mineralised potential of this region.
We look forward to the TSC geological team following up these results with further work early in the new calendar year.”
Twenty Seven Co. Limited (ASX: TSC) (“TSC” or “the Company”) advises that it has received assay results from its first pass rock chip sampling program at the Trident Project located in NSW (Figure 1).
A total of 152 rock chip samples have been taken from across the northern portion of the tenement, (see Figure 2) within areas of historically reported highly anomalous copper, gold, tin and other critical elements.
Full results received to date are presented in tables 1 and 2 below.
Figure 1: Location of TSC’s Broken Hill tenements
Figure 2: Map showing the locations of the recently taken rock chip samples.
The rock chip program was undertaken to target copper and gold mineralisation along with confirmation of the historical lithium samples taken by previous explorers 1,2 &3. The program was also designed to assist the Company to build its understanding of the regional geology, mineralisation potential and mineralisation patternation within this copper-gold province and tin province.
From the results received numerous follow up areas have been identified in respect of Cu, Au, Nb, Ta, and Rb.
Analytical results from the rock chip samples have been received by the Company, with significant results from numerous areas that require follow up work. Figure 3 shows the rock sample that returned 17.6% copper and Figure 4 shows the sample location that returned 1.275g/t Au.
Figure 3: Horrie Hoars Gold Mine. Malachite & rare azurite in Pelite from location 556979mE 6515472mN 556979mE
Figure 4: Horrie Hoars Gold Mine which returned the 1.275g/t Au sample from 558881mE 6520483mN
Significant results from all of the 152 rock chip samples received are shown in Table 1 and 2. Table 1 shows the base metal results and Table 2 shows the critical metal results.
Table 1: Significant base metal results from the most recent rock sampling
Table 2: Assay results of the Critical metals
Trident lithium Sampling Program Background
As recently reported (see ASX release dated 16 September 2021), TSC’s technical team has compiled extensive amounts of historical geochemical data regarding the Trident Project area from the NSW MinView geological database, which led to the identification of multiple potential new lithium and tin geological targets.
The pegmatites identified within the field have been sampled by previous explorers1,2 &3 and show that lithium occurs within amblygonite, and lesser lepidolite which are both important minerals for lithium mining, also historically, sporadic tin mining occurred in the Euriowie Tin Field from the 1880’s to 1970’s, leaving the area littered with evidence of old workings.
The initial visual observations were encouraging on the presence of lithium minerals, particularly amblygonite, however on receiving the assay results it has shown that lithium bearing minerals are not present within the pegmatites, with a 5m chip sample returning only 0.25% LiO2. The assay technique that was undertaken on the TSC samples is Na2O2 peroxide fusion by ICP-AES finish which is seen as a total digesting technique and is a good analysis for lithium, as well as other resistive minerals.
TSCs geology team are undertaking further analysis to determine why the current results are different from the historical reported results.
Classification of pegmatites can be split into different types, NYF (Niobium-Yttrium-Fluorine) and LCT (Lithium-Caesium-Tantalum) pegmatite. The NYF family of pegmatites is based on compositional characteristics that are related to the source (provenance) of the original magma and the chemical evolution of the magma as components are removed and others are concentrated as fractional crystallisation and differentiation occur. These three elements (NYF) are the most notably enriched; however, other rare elements are also characteristically elevated in their concentration. yttrium and the lanthanides are Rare Earth Elements (REE), all of which have similar geochemical behaviour; consequently, NYF pegmatites are usually enriched in all of the REE. Elevated concentrations of Sc, Zr, U, and Th are also typical, (Rakovan 20084).
A good breakdown of the different classifications of pegmatites are shown in Table 15 &6. Within the NYF pegmatites; Y, REE, Cs, Be, Ga, Nb, Ta and F elements that can be enriched due to crystallisation of the pegmatites. From the assay results received to date, most of these elements mentioned above are enriched and show the potential for Trident to host significant NYF pegmatites.
Figure 5: Table of pegmatite classifications. After Cerný, P. 1991, and modified from Simmons et al. 2003
TSCs intended next steps over the coming months include the following:
- Plan further infill geochemical sampling around the high-grade copper, gold and tin rock sample results,
- Submit selective samples for REE analysis,
- Visit the Perseus tenement once mustering allows access,
- Commence drilling key anomalies at the Rover Project in WA,
- Receive assay results from Rover, and
- Drilling scheduled for NSW Midas project February 2022.
- Visual identification of amblygonite is problematic therefore field identification my not correspond to laboratory assays.
- Dukovic, T. (2017) Annual Report for EL8468 for the Period 22 September 2016 to September 2017. Unpublished Report Mica Exploration Areas Pty Ltd, GSNSW Report GS2018_0298_RE0010150_ALL.EL8468 Annual Exploration Report 2017.
- Refer to ASX announcement dated 16th September 2021: Lithium and Tin Targets Identified at Trident Project, NSW
- Rakovan, J. 2003. Word to the Wise: Pegmatite. Rocks & Minerals, Volume 83 July/August 2008
- Cerný, P. 1991. Rare-element granitic pegmatites. Part I: Anatomy ˇ and internal evolution of pegmatite deposits. Part 2: Regional to global environments and petrogenesis. Geoscience Canada 18:49–81.
- Simmons, W., K. Webber, A. U. Falster, and J. Nizamoff. 2003. Pegmatology: Pegmatite mineralogy, petrology and petrogenesis. New Orleans, LA: Rubellite Press.