Skip to content

Mineral Resources Tasmania

Exploration Drilling Grant Initiative (EDGI) – Round 5 Data Now Available

Mineral Resources Tasmania has now released to Open File, Final Reports from five Round 5 EDGI co-funded drilling projects, completed in April 2022. Another five Round 5 reports are due to be made Open File in early 2023, after these projects were extended due to COVID-related delays.

Galena-siderite fissure lode in hole ZM141A, drilled 90m beneath the Zeehan field’s largest silver producer,
Montana No. 1 mine. (1.2m at 31.8 oz/t Ag, 23.9% Pb from 423.0m)

The reports now being made Open File cover the following projects:

Comstock (Lead, Zinc, Silver, Tin, Iron, Nickel) – Hole SY801 – Australian Hualong Pty Ltd
Montana No.1 (Tin, Silver, Lead, Zinc) – Hole ZM141A – Stellar Resources Ltd
Oonah (Tin, Silver, Lead, Zinc, Copper) – Holes ZO142 & ZO144 – Stellar Resources Ltd
Zeehan Western (Tin, Silver, Lead, Zinc) – Hole ZW145 – Stellar Resources Ltd
Queen No. 4 (Tin, Silver, Lead, Zinc) – Hole ZQ146 – Stellar Resources Ltd

Data includes the Final Reports as well as all available geological, assay and hyperspectral data (where available).  Drill core is available for viewing, by appointment, at the Mornington Core Library.

The Comstock project aimed to further evaluate the potential for a Renison style system at this prospect and follow up on encouraging results from Round 1 EDGI hole SY800. SY801 again intersected two zones of mineralisation, an upper structural Balstrup Fault zone and a deeper replacement zone.  However, all assays from these intersections are sub-economic.

The EDGI projects at Zeehan were designed to test an exploration model of silver-lead-zinc base metal mineralisation, grading with depth, into pyritic cassiterite mineralisation, beneath four historic silver-lead mines.

At Montana No.1 mine mainly silver-lead-zinc mineralisation was intersected by hole ZM141A, with only minor zones of pyrite-cassiterite and it was concluded that the transition into dominantly tin mineralisation may still occur at depths greater than those tested.

Beneath the Zeehan Western mine hole ZW145 only intersected narrow silver-lead lodes, with no significant tin mineralisation.

At Queen No. 4 silver-lead mine, ZQ146 also tested for a down-dip transition to cassiterite mineralisation. Three narrow, low to moderate grade tin intervals were intersected.  One aligns with the down-dip extension of the mine stopes, suggesting possible continuity with the lode.  It is interpreted that the transition from base metal to pyrite hosted cassiterite mineralisation has almost fully occurred at the depth tested by ZQ146.

At the Oonah Mine two holes, spaced 100m apart, aimed to test for down-dip transitional cassiterite mineralisation, 50m below the known base metal and stannite resource.  Both holes intersected fracture and breccia hosted, pyritic low-grade cassiterite dominant tin mineralisation.  The company concludes a transition down-dip from stannite to cassiterite mineralisation is recorded in both holes.