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TRENGGALEK

East Java, Indonesia

  • SUNDA MAGMATIC ARC

  • Copper Gold Project

  • 12,813 ha

  • Porphyry and Epithermal 

  • SIMILAR SIZE VOLCANIC CENTRE TO TUJUH BUKIT (30.1 Moz Au - 18.9 Mlb Cu).

  • MULTIPLE PROSPECTS, MANY OF WHICH REMAIN UNDRILLED.

  • SIGNIFICANT DATABASE OF PREVIOUS EXPLORATION WORK.

Copper Gold Porphyry and Epithermal Project

  • Advanced 12,813-hectare IUP-OP (Operation Mining Permit) highly prospective for epithermal and porphyry-related gold and base metal deposits.

  • Identified by Indonesian Government as a Top 3 priority greenfield gold project.

  • §Previously explored by PT Aneka Tambang (1990s) and then Arc Exploration Ltd in a JV with Anglo American (2012-2014) and PT Dunusa Tambang Nusantara (2015 – 2018).

  • Historic exploration included:

    • 17,786m of drilling

    • 3,675km airborne magnetic and radiometric survey.

    • Surface geochem survey of >10,500 soil and >5,000 rock samples.

    • Ground IP/Resistivity.

SIMILARITIES TO TUJUH BUKIT

  • Trenggalek exhibits a similar sized volcanic centre (5.6km) to the nearby Tujuh Bukit deposit (30.1M oz Au & 18.9Bn lb Cu) cut by major structural lineaments, annular medium to high intensity magnetic features, with zones of hydrothermal alteration related to discrete areas of low magnetics.

  • Petrological studies completed on selected core samples from Trenggalek has confirmed porphyry-type mineralisation and alteration for selected drill targets. These rock types found  at Trenggalek are similar to those rocks hosting the Tujuh Bukit and Batu Hijau deposits.

Images showing comparison of the RTP magnetic anomalies between the Tujuh Bukit project and the Trenggalek project areas.

“The perspectivity of the Trenggalek Project to host world class porphyry style copper-gold-molybdenum mineralization is tremendous.”

— Technical evaluation & assessment of the Trenggalek Project under the Arc Exploration Ltd - Anglo American JV Agreement. TG Alburo / L Dagdag July 2014

Trenggalek Prospects

SUMBERBENING PROSPECT - PORPHYRY SYSTEM

  • Anglo’s top priority prospect at Trenggalek.

  • Similar geological setting as Tujuh Bukit.

  • High-sulphidation Au-Cu and porphyry Cu-Au type resource potential

  • Characterised by 3km x 2km area of advanced argillic alteration.

  • Sumber Bening prospect remains undrilled

“Sumber Bening was ranked as the first priority prospect by Anglo American's exploration team within the Trenggalek IUP-OP.”

Singgahan & Jerambah Prospects –Defined Porphyry Targets

  • Singgahan - Four drill holes totaling 1,541.7m have been completed and this includes one inclined diamond hole (TRDD058) to a depth of 795.8m.  

  • Jerambah is a copper-gold porphyry target that has four drill holes completed totaling 2,445m and this includes one inclined diamond hole (TRDD054) to a depth of 1,022.3m.

3D model  of Singgahan and Jerambah prospects showing large magma chamber as fluid source for upwelling volatile-rich porphyries.

Buluroto Prospect

EPITHERMAL AND PORPHYRY SYSTEM

  • The Buluroto prospect holds potential for a porphyry related gold and copper target based on mineralisation. 

  • Results from previous 11 hole 1,380.4m scout programs at Buluroto intersected significant Cu-Au mineralisation within an up to 75m wide zone of crackle breccia and stockwork veins.

SIGNIFICANT DRILL INTERCEPTS INCLUDE:

TTRDD032: 13.7m @ 3.2 g/t Au, 60 g/t Ag incl 2m @ 8.7 g/t Au, 48 g/t Ag from 13.7m.

TRDD025: 24.5m @ 0.51 g/t Au, 0.21% Cu and 16 g/t Mo from 138.5m.

Sentul Prospect

HIGH GRADE EPITHERMAL TYPE AU-AG VEINS

  • The Sentul area demonstrates polyphase low sulphidation type epithermal quartz-chalcedony-sulphide veins/breccia up to 10m-15m wide and having greater than 5km-10km collective strike length consisting of Au + Ag.

  • ▪Sentul is a very large gold-bearing epithermal vein system, initial scout drilling of 36 holes totaling 4,696.20m has only tested total vein-trace length of about 650m, this represents approx 10 – 20% of the vein system.

  • The vein system is complex and open in all directions.

  • There is sufficient volume to indicate that it may host a large gold resource in multiple ore shoots with further potential for high-grade veins at depth.

SIGNIFICANT DRILL INTERCEPTS INCLUDE:

TRDD004: 9.65m @ 4.51 g/t Au, 8 g/t Ag incl 2m @ 17.2 g/t Au, 13 g/t Ag from 111.35m and a further 10.75m @ 3.62 g/t Au, 9 g/t Ag incl 1m @ 7.34 g/t Au, 10 g/t Ag from 127.95m.

TRDD002: 6.65m @ 3.29g/t Au, 10g/t Ag incl 1m @ 11.7g/t Au, 18g/t Ag from 49.35m.

TRDD005 : 9m @ 4.91g/t Au, 19g/t Ag incl 1m @ 8.1g/t Au, 23g/t Ag from 5.8m.

2024 Phase 1 Drill Plan

The Phase 1 scout drilling programme will test 4 of the 6 porphyry-related systems identified within the Trenggalek IUP, and includes:

  1. Sumber Bening (high-sulphidation/porphyry target) – 4 Holes for a total of 2600m to test both near surface high sulphidation type alteration and deeper porphyry targets defined by 3D magnetic inversion modeling.

  2. Jerambah-Torongan (porphyry target) – 3 Holes for a total of 2500m – to test both near surface high sulphidation type alteration and deeper porphyry targets defined by 3D magnetic inversion modeling. One hole will also test the depth extension of a chalcopyrite-bearing quartz breccia at Buluroto that may have a deeper connection to the Jerambah porphyry target.  

  3. Singahan (porphyry target) – 5 Holes for a total of 3200m – to test select porphyry targets defined by surface rock samples and 3D magnetic inversion modeling.  Five separate porphyry targets have been defined for a potential total of 262 Mt.