Thomson Resources (ASX: TMZ) has received a positive final batch of assay results from the 2022 drilling programme at the Thomson’s 100% owned Bygoo Tin project, located in the Lachlan Fold Belt in New South Wales.
The results from the last batch of assays cover the final three holes of the 2022 drilling programme show further strong mineralised sections of the greisens have been intersected.
“Given the weather conditions during the planned 2021/2022 drilling programme severely curtailed the period available to us to drill, the limited number of holes were very pleasing with the continuation of outstanding results,” Executive Chairman, David Williams, said.
“Hopefully the weather will be kinder to us for the 2022/23 season and we can complete the desired programs.
“Whilst the tin prices have come off from the highs earlier in the year, they are still significantly higher than 2 or more years ago.”
An exceptional result was returned from up-dip drilling on the “P380” greisen. This is a relatively newly defined zone which appears to sit about 50m north of, and parallel to, the east-west striking Main zone at Bygoo.
It is named after an historic hole, P380, drilled by Cominco in joint venture with the Ardlethan Mine operators in 1976. The historic P380 hole intersected 18m at 0.5% Sn from 153m downhole and Cominco terminated their interest in the area soon after.
Thomson has had some issues locating these old historic holes as they were drilled in a cropped paddock on a local grid. P380 was drilled east to west and this suggested that the hole may have skimmed the side of an east-west striking zone.
Accordingly, in the 2021 drilling programme, BNRC73 was drilled by Thomson north to south, 50m up-dip of P380 and intersected 23m at 1.4% Sn.
This result encouraged the drilling of the 2022 hole BNRC85 which had a significant intercept of 26m at 2.1% Sn from 94m depth. This hole was drilled a further 40m up-dip of hole BNRC73. This intersection includes an exceptionally high-grade interval of 6m at 5.0% Sn from 104m depth.
Another very good result was returned from the hole drilled in the Smiths greisen, which is 400m south of Main Zone. BNRC87 returned a significant intercept of 25m at 0.5% Sn from 59m depth, extending the mineralisation 35m east of the previous mineralised hole drilled in this greisen in 2017 by Thomson, hole BNRC31 which had a significant intercept of 20m at 0.9% Sn from 42m depth.
Thomson had attempted to find this extension of the Smiths greisen in the 2018 drilling programme with BSRC02 but despite a wide greisen intercept the tin was lacking with a best intercept of only 3m at 0.2% Sn. A new interpretation suggested that the Smiths greisen ran between BSRC02 and the old 1976 hole, P292.
The results from hole BNRC87 and the new intersection confirms this new interpretation.
Another drill hole in the 2022 drilling programme, BNRC86, was completed on the northern end of the Dumbrells greisen.
Although a thick greisen was intersected, the tin values were low – best intercept was 22m at 0.1% Sn from 31m depth, with a slightly higher grade of 4m at 0.3% in the centre of that.
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