ASX RELEASE
15th February 2022
ASX: PEC
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CORPORATE
onlyDIRECTORY Executive Chairman Julian Babarczy
Managing Director
Robert Benussi
Non-Executive Director useBrett Grosvenor
Company Secretary Nicholas Katris
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PROJECTS
Beharra Silica Sands personalArrowsmith West
Sargon Hub
Eneabba Hub
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CONTACT
223 Liverpool Street Darlinghurst NSW 2010
Robert Benussi
+61 410 415 335
ForWe wish to acknowledge the Traditional Custodians of the
land (Yamatji Southern
Regional) on which we are
developing the Beharra
Project, and pay our respects to their Elders past, present and emerging.
Sampling Underway for Bulk Metallurgical Test Work Targeting Multiple Zones within White Sand Horizon
HIGHLIGHTS:
- Sampling program scheduled for completion this week targeting multiple zones within the Beharra white sand horizon, with samples being prepared for delivery to IHC Mining.
- A total of four domains have been subject to separate bulk sampling activities, providing comprehensive data set for detailed analysis of impurity profile changes with depth.
- Testing is targeting identification of a very high grade and low impurity zone within the Beharra White sand sequence, consistent with prior desktop analysis of recent drill results.
- Successful confirmation of a low impurity horizon has potential to position Perpetual as a leading new supply source within the fastest growing low impurity Asian silica sand markets.
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Laboratory results anticipated to be received in the June quarter
Perpetual Resources Limited ("Perpetual" or "the Company")
(ASX: PEC) is pleased to announce that the sampling program looking to identify and confirm the chemical characteristics of the distinct horizons within the Beharra white sand sequence is due for completion this week, with samples being prepared for delivery to IHC Mining (recently renamed from IHC Robbins) in Brisbane who will undertake the bulk metallurgical testing program.
A total of four separate bulk samples have been prepared, representing a total of approximately 4 tonnes of drill sample (approximately 1 tonne per zone), with samples taken from the drill program completed in August 2021.
The aim of this bulk metallurgical test program is to individually identify the chemical composition and end product specifications from the various zones identified within the Beharra white sand sequence. Previous analysis of drill data suggests potential for a very low impurity horizon that may be amendable to selective mining and processing to deliver an extremely high-quality end product for the high value ultra-clear glass markets in Asia.
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Figure 1 - Images from white sand sampling program targeting multiple zones within Beharra
white sand sequence
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Background to Bulk Sampling Efforts
Initial metallurgical analysis at Beharra commenced on a comingled white and yellow sand feedstock, with an aim of determining the end product specifications if the Beharra orebody was processed without any selectivity. This was seen as a prudent first step in analysing the Beharra project, to be used as a baseline to assess all other future end product analysis. Representative bulk metallurgical test results for the comingled white and yellow feedstock were confirmed as the following (for additional information, please see ASX announcement dated 29th January 2021, titled, "Exceptional Metallurgical Test Results - Beharra");
Beharra Comingled Sand | SiO | Fe O ppm | Al O ppm | TiO ppm | Mass Yield | |||
For | 2 | 2 | 3 | 2 | 3 | 2 | ||
Beharra Special AFS #46 | 99.6% | 280 | 1825 | 375 | 68% | |||
Beharra Premium AFS #44 | 99.6% | 276 | 1789 | 369 | #46 & #27 combined | |||
Beharra Special AFS #27 | 99.7% | 235 | 1405 | 300 | 6% |
Figure 2 - Results of January 2021 bulk metallurgical test work which assessed a comingled
white and yellow sand feedstock
These metallurgical test results were used as the foundation for the preparation of the Beharra Pre- Feasibility Study (Beharra PFS), which was released in March 2021 (please see ASX announcement dated 17th March 2021, titled, "Maiden Ore Reserve and Outstanding Beharra PFS Result Update").
Subsequent to these results and the Beharra PFS, Perpetual then sought to confirm the end product specifications under a selective white sand mining and processing scenario.
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Perpetual undertook an 86-hole air core drilling program, the results of which were announced in August 2021 (for additional information, please see ASX announcement dated 30th August 2021, titled, "Phase 3 Air Core Infill Drilling Results - Beharra"). The drill samples collected from this drilling program were utilised for the preparation of a bulk representative metallurgical testing program that excluded yellow sand, with the following results confirmed (for additional information, please see ASX announcement dated 2nd December 2021, titled, "Beharra Test Work Confirms Exceptional White Sand Impurities");
only | Beharra White Sand Only | SiO | 2 | Fe O | 3 | ppm Al | O | 3 | ppm | TiO | 2 | ppm | Mass |
2 | 2 | ||||||||||||
Beharra Special White | 99.6% | 173 | 1986 | 342 | 100% | ||||||||
Beharra Premium White Coarse | 99.6% | 160 | 1620 | 290 | 14% | ||||||||
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Beharra Premium White Fine | 99.6% | 175 | 2045 | 350 | 86% | ||||||||
Figure 3 - Results of December 2021 bulk metallurgical test work which targeted the white | |||||||||||||
sand only horizon at Beharra | |||||||||||||
While the impurity reductions confirmed by the white sand only test results were compelling,
demonstrating a reduction in the key impurity Fe2O3 of almost 40%, further analysis showed that the bulk sampling process had led to the inclusion of significant levels of the grey sand horizon (22% of all samples included were from the grey horizon), which sits adjacent to the water table and is unlikely to be mined by Perpetual.
Beharra Sub-Domains | Number of samples | Proportion | SiO | Fe O | AL O | LOI | ||
2 | 2 | 3 | 2 | 3 | ||||
Yellow | 12 | 2% | 99.15 | 0.08 | 0.22 | 0.3 | ||
White Upper | 305 | 42% | 99.04 | 0.13 | 0.28 | 0.19 | ||
White Lower | 244 | 34% | 98.30 | 0.21 | 0.61 | 0.24 | ||
Grey Pod | 1 | 0% | 98.80 | 0.18 | 0.28 | 0.29 | ||
Grey | 159 | 22% | 93.10 | 0.33 | 4.05 | 1.35 | ||
Total | 721 | 100% | 97.48 | 0.2 | 1.22 | 0.47 |
personal | Note: Table is indicative only, with all calculations based on an arithmetic average of included drill holes only |
Figure 4 - Indicative analysis of the samples that were selected to comprise the bulk | |
sample in the most recent metallurgical test work at Beharra | |
It is believed that the inclusion of this grey sand has increased the overall impurity profile of the white | |
For |
sand bulk metallurgical test results, leading to a higher level of impurities reported than would potentially therwise be the case if this grey sand was not included. The grey horizon introduced an elevated level of feldspar to the bulk sample which cannot readily be removed using the proposed metallurgical stages. This contributed to higher levels of Al2O3 and K2O and commensurately lower SiO2 grade in the bulk sample results. Potential to use the presence of feldspar in the lower grey domains could provide
some market access where feldspar is incorporated as a flux.
Additional analysis also revealed that the impurity profile within the Beharra white sand sequence demonstrated distinct geological sub-domains, with potential for chemical and lithological/mineralogical zonation between an upper and lower sub-unit. The upper unit appeared to contain a higher SiO2 content and a lower impurity profile.
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personalThe focus of the current bulk sampling and testing program has been to extract bulk representative samples from each of the identified sub-domains. These include; Yellow sand horizon, Upper White
sand horizon, Lower White sand horizon, and the Grey Sand horizon. The Grey horizon has been further divided into Grey sand above the water table and Grey sand below the water table. The aim of Fortesting these separate sand horizons (sub domains), is to accurately determine whether selective mining and processing of these sub domains can deliver distinct end product characteristics, ideally with one horizon (thought to be the upper white horizon) containing a very low impurity profile that might position Beharra end product as a premium low iron silica sand that could target the fast-growing ultra-
clear glass markets in Asia.
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Figure 6 - Images of production scale equipment at IHC Mining that will be utilised for
Perpetual's upcoming bulk metallurgical test work. Images are: spiral testing unit on left, wet
high intensity magnetic separator on the right
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Sampling Process Undertaken in Recent Program
The drill samples totalling 1,145 bags for a total weight of 6,288kg were transported from the Company's store in Dongara, Western Australia to a warehouse in the Gold Coast, Queensland located about 30km from IHC Mining testing facility. The samples were to be prepared for proposed white sand only testing and to provide representative samples from all geological domains for particle size distribution (PSD) analyses.
ForThe sample preparation process involved checking the sample number on the bag with the sample ticket that was placed in the bag when the sample was collected from the drill rig cyclone and then allocating the sample to a selected domain. Approximately three quarters of the sample was removed by either riffle splitting, spearing, or quartering and placed in the appropriate bulker sample bag being either yellow, upper white, lower white, and grey above and grey below the water table. The remaining sample was then either placed in its original drill sample bag for storage or further sub-sampled for collection for PSD requirements.
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Perpetual Resources Ltd. published this content on 14 February 2022 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 14 February 2022 21:53:01 UTC.