Drilling has extended TMZ’s Stewarts discovery first made last year at the Bygoo tin project in New South Wales’ prodigious Lachlan Fold Belt.

The 13 reverse circulation holes totalling 1,870m to follow-up on the 118m intersection grading 0.43% tin from a down-hole depth of 57 at BNRC691, intersected wide greisen intersections with similar mineralogy.

Stockhead’s man of metal, Bevis Yeo has poured over the numbers, highlighting notable intersections of mineralisation – including 75m at BNRC75, 113m in BNRC78, 60m in BNRC79, 79m in BNRC80D, 66m in BNRC82, and 80m in BNRC83.

He says intersecting these wide zones of mineralisation is exciting for Thomson Resources (ASX:TMZ) as it was originally thought that the discovery hole, BNRC69 may have been drilled down-dip.

While this is partly true, Bevis says, the mineralisation width at Stewarts appears to be in the range of between 50m to 60m rather than the expected 10m to 15m.

Tin is in a structural deficit with no new sources of production expected for at least three years, so extending the Stewarts discovery could be significant for the company.

Additional RC holes also extended the Dumbrells, P380 and Smiths mineralised zones within the Bygoo project.

“This has been a difficult season for drilling at the Lachlan Fold Belt projects, but the teams have persisted and managed to complete a good program at the Bygoo tin project,” executive chairman David Williams said.

“This should now give us sufficient data to complete the maiden Mineral Resource Estimate for the Bygoo tin deposit which was our aim.

“That aside, we continue to see the mineralised zones extending where we drill and it continues to show what a great tin project Bygoo is,” Williams added.

In addition, the company drilled two diamond holes to give important information on mineralogy and orientation of the tin zones as well as specific gravity for resource estimation.

All zones at Bygoo remain open as drilling was interrupted by major rain events, farming operations as well as equipment supply chain and personnel issues, thanks again to COVID.

Drill results

TMZ noted the intersected zone at Stewarts appears to be thickest and strongest next to the Ardlethan granite boundary while holes drilled below the shallow workings in the granite outcrop area returned weak intercepts of poorly developed thin greisens.

The zone is also open to the northeast though this is partly constrained by the barren hole BNRC81.

Meanwhile, BNRC85 was successful in extending the P380 zone, which runs east-west parallel to the Main zone, up dip and with a greisen intersection that looks stronger and wider than that in BNRC73.



This article was developed in collaboration with Thomson Resources, a Stockhead advertiser at the time of publishing.


This article does not constitute financial product advice. You should consider obtaining independent advice before making any financial decisions.