Auric Mining

Chalice West Drilling Update: Rare Earth Results

Auric Mining Limited (ASX: AWJ) (Auric or the Company) is pleased to provide further detail following the completion of drilling at the Company’s Chalice West Project near Higginsville-Widgiemooltha, Western Australia. The drilling program was completed on 22 November 2022 with 227 aircore drill holes drilled for 7,227m (Figure 1).


Highlights of this Announcement

  • Highly anomalous one-metre regolith interval at 1.1 wt.% TREO (22% MREO) with only 139 ppm phosphorous.
  • One 17-metre interval from 4 metre below surface at 1,699 ppm TREO (21% MREO).
  • Magnetic granite from bottom-of-hole samples has up to 1,595 ppm TREO (28% MREO).
  • Anomalous REE values coincide with linear 7 kilometre long NW-trending magnetic feature.
Onsite pXRF testing for nickel and proxies for lithium and rare earth elements (REE) was used as an objective basis for selective (1 m) sampling and associated multielement laboratory analyses. REE analyses have been returned for 95 bottom- of-hole (BOH) composite samples and 178 1-m interval regolith samples for 19 holes. Analyses are pending for a further 108 BOH samples and 193 1-m interval samples. Several distinctly anomalous intervals for REE have been returned in the results received to date and are described in this announcement.

The current results reveal anomalous REE values from regolith and BOH samples with up to 1.1 wt.% TREO (total rare earth oxide). All analyses were performed using 4- acid-digest in order to include nickel, lithium, REE and other metals in the analysis. This method also minimises the digestion of acid-resistant REE minerals such as monazite, that are unlikely to be recovered from REE clays.

Figure 1. Chalice West aircore drill holes at completion of program

Program and Results-to-Date

Hole AAC0279 has a 17-m interval of 1,699 ppm TREO from 4 m below surface with a weighted average MREO (magnetic REO) proportion of 21%. This hole coincides with a deeper weathering profile compared to adjacent holes at the eastern flank of a round ~700 m diameter magnetic feature (Figure 2). On the western flank of the local magnetic anomaly in the deeper weathered sections, hole AAC0286 has 13 m @ 1,351 ppm TREO (20% MREO) from 13 m and hole AAC0285 has 8 m @ 885 ppm TREO (22% MREO) from 13 m (Figure 3). Holes collared above the round magnetic feature (AAC0280–AAC0284) largely drilled transported material and had blade refusal depths of 2–10 m (Figure 3). Refer to Appendix A for a table of significant results received to date and detail on intercept aggregation methods.

The high-grade interval (1.1. wt.% TREO) in hole AAC0239 (42–43 m) is unlikely “ionic clay” due to low Al (8.1 wt.%) and K (0.38 wt.%) concentrations and limited adsorption capacity of clays in general. The same applies to the high-grade interval in hole AAC0279 (17–18 m) with 0.49 wt.% TREO and low Al (1.8 wt.%) and K (0.07 wt.%) concentrations. However, for both intervals P values are below 170 ppm, suggesting that the acid-resistant mineral monazite (REEPO4) is not responsible for the reported REE grades. Metallurgical tests and petrographic studies will determine the leachability and nature of the high-grade REE mineralisation.


Click here for the full ASX Release

This article includes content from Auric Mining, licensed for the purpose of publishing on Investing News Australia. This article does not constitute financial product advice. It is your responsibility to perform proper due diligence before acting upon any information provided here. Please refer to our full disclaimer here.

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