Tyranna Resources Eyes Q2 2027 Drilling After Angola Soils Hit 13.18% Rare Earths
Key Takeaways
- Historic soils at Coola peak at 13.18% TREO and 3.9% Nb₂O₅, with 185 of roughly 1,084 samples above 1.5% TREO and 26 above 5% TREO.
- Rock chips support the soils, with 11 of 79 samples assaying 2.12% to 4.85% TREO and 10 returning 1.03% to 2.85% Nb₂O₅.
- A roughly 3km carbonatite ring dyke with exposures up to 50 metres wide is described as drill-ready, with maiden drilling planned for Q2 2027 subject to the wet season.
- No Mineral Resource has been estimated, no niobium mineral work has been done, and the announcement discloses no funding details for drilling.
- Tyranna may earn 70% of Coola Mining LDA, and the 830km² title remains subject to an extension of term application instructed for processing on 21 July 2026.
Soils up to 13.18% TREO define Coola drill targets in Angola
Tyranna Resources has completed a review of exploration data supplied by the vendor for the Coola Prospect, part of the Coola rare earths niobium project in central Angola. The historic soil results peak at 13.18% TREO (total rare earth oxides) and 3.9% Nb₂O₅ (niobium oxide), and the Angola carbonatite ring they surround is now the focus of planned drilling.
This is not fresh sampling. The data was compiled by the project vendor, a subsidiary of Pensana Plc, and reviewed by Tyranna and its Competent Person.
From roughly 1,084 historic soil samples, the headline numbers are:
- 185 samples above 1.5% TREO
- 26 of those above 5% TREO, with the peak of 13.18% TREO
- 25 samples above 2% Nb₂O₅, with a peak of 3.9% Nb₂O₅
Maiden drilling is planned for Q2 2027, subject to the duration of the wet season, which usually runs from November to March. For you as an investor, that sets the timing risk: weather, not funding disclosures, is the stated variable.
David Crook, Managing Director
“The historic work is significant and has handed Tyranna a refined suite of drill targets from day one…”
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Rock chips and a 3km ring dyke back the soil anomalies
Rock chip confirmation
Surface soil results are only as convincing as what backs them up. Here, rock chip sampling supports the soil geochemistry, with assays up to 4.85% TREO and 2.85% Nb₂O₅.
The rock chip dataset includes 79 samples. Of these, 11 assayed between 2.12% and 4.85% TREO, and 10 assayed between 1.03% and 2.85% Nb₂O₅.
| Dataset | Result | Sample count | Why it matters |
|---|---|---|---|
| Soils | Peak of 13.18% TREO and 3.9% Nb₂O₅ | ~1,084 | Defines rare earths and niobium anomalies around the ring dyke |
| Rock chips | Up to 4.85% TREO and 2.85% Nb₂O₅ | 79 | Supports the soil geochemistry |
| Auger | 8 holes between 1.04% and 1.92% TREO | 49 holes | The 8 holes were drilled adjacent to outcropping carbonatite |
| Mineralogy | 3.72% TREO head grade; bastnäsite, monazite and florencite identified | 1 hand-picked rock sample | Identifies the main REE minerals in the carbonatite |
The mineralogy result comes from a single sample, so treat it as an early indicator rather than a representative figure.
Drill-ready geometry
The Coola carbonatite ring dyke is ~3km in circumference, much of it overlain by anomalous TREO and/or Nb₂O₅ geochemistry, and the company describes it as drill-ready. Mapped carbonatite exposures reach widths of up to 50 metres in places, and the incomplete ring dyke surrounds a central diatreme, a volcanic pipe-like feature largely obscured by soil cover and weathered material.
Previous work completed by the vendor includes:
- Four phases of soil geochemistry, all analysed by Nagrom in Perth, Western Australia.
- Auger drilling, 49 holes at 100m x 100m spacing within the central diatreme.
- Reverse circulation (RC) drilling, 8 holes, screened with a pXRF (handheld X-ray fluorescence) device, with results not reported.
- Ground magnetics and radiometrics surveys covering 2.5km².
One caveat matters. No work has been undertaken to identify niobium minerals, so the niobium story rests on geochemistry alone for now.
How do carbonatites host rare earths and niobium?
Carbonatites are formed by magmatic activity associated with deep mantle-derived alkaline melts. Management states that carbonatites host many of the world’s major rare earth and niobium mines.
TREO is simply the sum of the individual rare earth element assays, each converted to its oxide form. It gives a single headline grade for a group of metals.
The company also notes that Angolan carbonatites are considered geological analogues of Brazil’s carbonatite deposits, which host major niobium, rare earth and phosphate resources.
What does that mean for you? A 13% TREO soil result is a surface reading that marks where to drill, not a measure of what is underground. No Mineral Resource has been estimated at Coola.
Regional neighbours and pipeline upside
The project sits within the Lucapa Graben, a regional tectonic corridor, roughly 60km northwest of Huambo. Management points to two nearby developments: the Longonjo Project, being developed by Pensana, located only 45km south of Coola, and the Niobonga Niobium Project, 250km southwest, under development by the Chinese-controlled Niobonga Comércio Geral.
The single granted Prospection Title covers 830km² and contains four alkaline intrusions. Coola is the most advanced, which the company says provides pipeline upside.
Tenure needs careful reading. Tyranna, through its subsidiary Luvulu (Mauritius) Limited, may earn a 70% shareholding in Coola Mining LDA. The title is subject to an extension of term application, and on 21 July 2026 MIREMPET (Ministry of Mineral Resources, Oil and Gas) instructed ANRM (National Agency for Mineral Resources) to process it.
Tyranna has operated in Angola for the past four years and has recently shifted its exploration focus from lithium to rare earth elements and other critical minerals.
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What are the December quarter activities and Q2 2027 drilling plans?
The outlook for the December quarter includes:
- 500 soil geochemistry samples across the wider Sulima West and Mt Verde Prospects
- Analysis of samples previously screened by pXRF from drilling, trenches and exploration pits
- Continued historic data integration ahead of drilling at Coola in Q2 2027, subject to the duration of the wet season
The announcement did not disclose financial or funding details for the drilling programme. What it does give you is a clear sequence: data integration now, target definition, then maiden drilling after the wet season.
Crook summed up the next step: “Our job now is to best use this significant data package to identify the highest quality targets and to start drilling.”
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