Pilbara Gold Projects
Pincunah Gold Project
Jimblebar Gold and Copper Project
Trek hold 100% ownership of two strategically located gold and base metal projects with an aggregate area of 267km2, representing an exciting new exploration and growth opportunity in the Pilbara, currently one of the most active districts in Australia for gold exploration following the breakthrough Hemi discovery by De Grey Mining.
The Pincunah Gold Project is located 70km west of Marble Bar and includes tenements located near significant established gold and base metal deposits. The Jimblebar Gold Project includes a greenstone-scale exploration opportunity within a historical goldfield. Both projects include prospects for gold and base metal mineralisation and numerous drill targets and exploration opportunities, with virtually no exploration in modern times.
Figure 1: Map of the highly prospective Pilbara Craton showing the location of the licences being acquired by Trek in relation to the other significant gold deposits and discoveries in the district. No mineral resources have been defined for the licences being acquired by Trek. All resource estimates in relation to third parties’ projects are total combined Measured, Indicated and Inferred JORC 2012 estimates.
Pincunah Gold Project (E45/4909, and EL(A)45/4917)
The Pincunah Project is located 70km west of Marble bar and 100km south of Port Hedland. Gold prospects occur in several settings. The Carlindi Shear lies within siliclastic sediments on the western side of EL45/4909 within a 6km long structural corridor (Figure 2). A second prospect area named Valley of Gossans was explored in the late 1960s where mapping, surface sampling and limited drilling identified wide zones of gold mineralisation in highly gossanous felsic intrusive, chert and ultramafic rocks (Figure 2).
EL(A) 45/4917 is located 10km east of Valley of Gossans. Previous work focused on the western edge of a large granite intrusive at the Honey Eater prospect, where copper and gold anomalies occur over 4km along a highly prospective north-northeast trending shear zone.
Figure 2: Simplified geology map of the Pincunah Gold Project showing the location of mineral occurrences within and along strike from the Trek Licences.
Jimblebar Gold and Copper Project (E52/3605 and EL(A)52/3672)
The two tenements are located 50km east of Newman. Gold mineralisation in the district is known to be structurally controlled where subsidiary structures cross-cut major faults, shears and lithological contacts.
The various Jimblebar historic gold mines and occurrences were explored extensively by Warwick Resources and Atlas Iron from 2003 to 2014. Warwick also completed a gradient array IP geophysics survey across the main workings Shearers, Sunny South and Pilliwinkle (Figure 9). The tenement covers the southern extension of the Sunny South Prospect which is located north of the company’s tenement boundary. The mineralisation at Sunny South is hosted by a 30m to 50m wide felsic to intermediate intrusive that occurs stratigraphically above the banded iron formation (BIF) and dips moderately to the east.
John Beeson of Jigsaw Geoscience reviewed the controls on mineralisation at Jimblebar and observed the gold mineralisation to be associated with a strongly pyritic and quartz-veined dacite porphyry intrusive. These intrusive rocks are interpreted by Beeson to be reminiscent of ‘mafic-series’ granitoids intimately associated with gold mineralization in the Yilgarn Craton for example Granny Smith and Sunrise Dam.
Figure 3: Simplified geology map of the Jimblebar Gold Project showing the location of mineral occurrences within and along strike from the Trek Licences.
The recent Hemi discovery by De Grey Mining have highlighted the potential for large-scale intrusive-related gold deposit systems throughout the Pilbara Craton.
At the Valley of Gossans Prospect, historical wide drilling intersections that range in grade from 0.8 to 1.4g/t Au at Gossan A and B are highly encouraging. The felsic porphyry intrusive host rock at VOG may be similar to the intrusive rocks at Hemi. Many holes at Hemi commenced utilising shallow aircore drilling into highly oxidised and altered rocks near surface similar to the mineralised alteration zones intersected at Gossan A and B. Deeper drilling at Hemi, encountered increasing gold grades at depth into the fresh sulphide zones where intersections such as 24m at 7.5g/t Au and 49m at 3.7g/t Au were returned (DEG Announcement dated 11 February 2020). Using the Hemi analogy, deeper drilling at both Gossan A and Gossan B is warranted to test the concept of increasing grades at depth into fresh rock. In addition, higher-grade mineralisation at Hemi occurs at the intersection of various gold-bearing structures with the prospective host intrusive lithology so more work is required to delineate the gold bearing structures and host rocks at VOG.
The Jimblebar gold trend is also highly prospective for gold deposits hosted in intrusive rocks similar to gold deposits in the Yilgarn Craton such as Granny Smith, Sunrise Dam and Gruyere. Mineralised dacite porphyry at Jimblebar indicates the southern Pilbara is also highly prospective and under explored for gold deposits hosted in intrusive rocks. Bonanza gold intersections at Sunny South along strike to the north further enhance the prospectively at Jimblebar.
At Carlindi, high grade intersections along the Carlindi shear are highly encouraging and the prospect area is highly prospective for Archean sedimentary hosted gold deposits such as Invincible at St Ives. Also, it is possible that the Soanesville Group and De Grey Supergroup sedimentary sequences at Carlindi may be a sedimentary equivalent to the Mallina Formation to the west that hosts the Hemi discovery which indicates potential for similar mineralised intrusive rocks. Further work is required to assess this possibility.
The Honey Eater gold-copper prospect trend is likely to be the gold-copper rich western extension of the Archean Panorama Trend that hosts the Sulphur Springs Cu-Zn-Ag VMS deposit. The prospect trend is highly prospective for copper-gold VMS deposits along a 4-5km strike length south of Strelley Pool where further work is warranted.