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- Assay results received for two holes from four-hole deep diamond drilling program
- Drilling program designed to test continuity of the Shirvington Zone at depth
- Bulk intercepts for both holes continued materially below the current MRE
- Assays complement other significant assays previously returned in Brightstar deeper drilling at Two Mile Hill-Shillington
Brightstar Resources (ASX: BTR) has received further positive assay results from a 3,800m diamond drilling program targeting the Two Mile Hill-Shillington deposit, part of the Sandstone gold project in WA.
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The drilling program intersected numerous occurrences of visible gold6,7 within wide zones of tonalite-hosted mineralisation, extending the known width of the unit to 400m at depth.
Assay results have now been returned for holes TMHDD26004 and TMHDD26005, which produced bulk intercepts within the host tonalite of 305m at 2.66 grams per tonne (g/t) from 503m (TMHDD26005), and two intercepts of 80m at 2.64 g/t from 499m and 240m at 1.16 g/t from 601m (TMHDD26004).
“The latest Two Mile Hill results demonstrate the vast scale potential that the deposit holds,” MD, Alex Rovira, said.
“This deep diamond drilling was designed to define the extent of the Shirvington Zone and assess the grade continuity at depth. What we have seen produced are wide, bulk intercepts of impressive gold grades. The standout result from these latest assays is 305m at 2.66 g/t gold in TMHDD26005. On a gram-metre basis, this is our biggest-ever intercept at Sandstone, totalling over 800 gram-metres.
“The drilling has produced classic Two Mile Hill-style mineralisation, defined by wide zones of lower-grade mineralised tonalite, punctuated by high-grade veins rich in visible gold. With the results from TMHDD26006 still pending, we look forward to receiving the final assays from the program.
“The next phase of drilling at Two Mile Hill has already begun, with a two-rig, 6,500m program now underway. This drilling targets further testing of the Shirvington Zone, at depth and along strike, and aims to intersect the western tonalite contact to fully define the extents of the host unit.”
The multi-rig follow-up drilling program totalling approximately 6,500m commenced in October, targeting extensions to the Shirvington Zone along strike and at depth and aiming to define the extent of the tonalite, including its western contact.
The combined Two Mile Hill-Shillington deposit hosts a current MRE of 24.6 million tonnes (Mt) at 1.8 g/t for 1.45 million ounces. The local geology consists of a tonalite intrusive stock intruded into a northeast-dipping package of basalt and banded iron formation (BIF).
The majority of the mineralisation is hosted within the tonalite itself, present as northeast-dipping lodes, typically associated with quartz-sulphide veins. Coarse visible gold has also been identified outside of the veins, within the matrix of the tonalite. Additional mineralisation is hosted within the adjacent BIF (Shillington-type) and basalt.
The current drilling program comprised four deep diamond drillholes for ~3,800m, aiming to intersect the Shirvington Zone at depth. Significant visible gold was identified from all four drillholes, totalling 93 individual occurrences.
BTR was down 1.08% to 73.2¢. Mkt cap $941.4M.
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