Tri Origin Minerals (TRO: ASX, TOR: TSX) has announced interim results from a preliminary drilling programme being conducted at its Woodlawn Project, 200 kilometres southwest of Sydney, NSW.
The company has intersected base metal-rich mineralization at significant depths below historic underground workings at the past-producing Woodlawn mine.
A first deep hole has been completed to a depth of 1236 metres and a “wedge” or daughter hole started at 404 metres down the first hole has also been completed to a depth of 955 metres as measured from surface.
The second hole is currently being completed and a wedge hole will be extended from it to investigate a strong down-hole electromagnetic geophysical anomaly detected during surveying just completed by the company.
Sample results from the first hole and its wedge cut have been received. Significant results include the wedge hole (WLTD009A) intersected 2.35 metres (approximate true thickness 2.00 metres) grading 0.9% copper, 1.3% lead and 13.8% zinc at 658.75 metres down-hole as measured from surface.
This intersection is believed to represent the edge of the down-plunge extension of the “D” zone approximately 300 metres below the deepest level where it was previously mined.
Also, the “parent” hole (WLTD009) intersected down-plunge extensions to mineralization representing the previously mined “I”, “B” and “J” zones. In this hole these zones are represented by strongly altered rock containing metre-thick beds of massive pyrite and wide zones of disseminated pyrite across down-hole intervals of up to 60 metres.
Assaying through these zones revealed elevated base and precious metal values of up to 7 grams per tonne silver, 0.7% copper, 0.4% lead and 0.7% zinc across 1 metre at 535 metres down-hole at what is believed to be the down-plunge extension of the “I” zone and 2.2% zinc at 907 metres down-hole at the southern limit of the down-plunge extension of the “B” zone.
While in production, the Woodlawn open pit and underground mine produced approximately 13.4 million tonnes of high-grade ore from a number of separate, faultbounded massive sulphide zones or lenses mined to a maximum depth of 600 metres below surface.
At the commencement of this drilling programme, it was the company’s belief that some of these lenses remained open both at depth and at shallower levels along strike.
The company said these two holes are the commencement of a longer-term drilling programme designed to test for the possible occurrence of extensions to ore lenses or new deposits nearby the past-producing mine.
A substantial Mineral Resource previously released by the company exists in the vicinity of historic underground workings and it is Tri Origin’s objective to add to this Resource through continued drilling at Woodlawn.
Disclosure: The author holds no positions in the company