ASX-listed explorer, Lefroy Exploration, says it has filled “a missing gap” at its Eastern Lefroy gold project near Kambalda, courtesy of the recent granting of a tenement that takes in the historic Burns gold-copper prospect.
The Perth-based company’s new ground also covers an extension of the banded iron formations that host the Lucky Strike gold mineralised trend. Lefroy recently released a near-surface mineral resource estimate for Lucky Strike of 1.27 million tonnes grading 1.95 grams per tonne for 79,600 ounces of contained gold.
In May 2011, Octagonal Resources discovered significant gold and copper anomalisms in weathered rock at Burns, with subsequent RC drilling intersecting some exciting broad zones of gold and copper mineralisation.
The former owners defined a one-square-kilometre area of gold anomalisms and a 2km-long copper anomaly on the north margin of the Burns intrusion which does not outcrop and is indicated only by a distinctive aeromagnetic and gravity geophysical signature.
Notable assays from Octagonal’s RC drilling included 50m grading 0.9 g/t gold and 0.5 per cent copper from 24m, 32m at 1.7 g/t gold and 0.6 per cent copper from 76m, 12m at 1.5 g/t gold and 0.5 per cent copper from 27m and 12m at 1.3 g/t gold and 0.8 per cent copper from 163m.
Other intriguing intercepts at the time included 6m at 4.9 g/t gold and 0.9 per cent copper from 24m, 3m at 16.1 g/t gold and 0.5 per cent copper from 35m and 1m at 8.5 g/t gold and 6.7 per cent copper from 123m.
Another 9m intersection went 1.5 g/t gold and 1.0 per cent copper from 58m and a further 9m section graded 1.0 g/t gold and 1.5 per cent copper from 115m.
The Burns mineralised system lies on the eastern margin of a large interpreted felsic intrusion, most of which Lefroy now has its dibs on via the wholly owned Eastern Lefroy project or the joint-ventured Western Lefroy project that it has with Gold Fields Ltd.
Whilst only a 20sqkm tenement, Burns now fills in a gap that used to exist in the company’s Eastern Lefroy project landholdings that now total 249sqkm.
The tenements containing the Lucky Strike, Neon and Havelock prospects now adjoin Burns, which in turn connects to the Lake Randall tenement, giving Lefroy a commanding prospective ground position in the region that now spans 40kms from the Hang Glider Hill prospect in the north-west as one contiguous project package to Lake Randall in the south-east.
We are very pleased to … seal a missing gap at Eastern Lefroy that now covers 40km of prospective ground (along the Mt Monger fault).
The Burns intrusion, with its unique geophysical signature, large footprint and associated gold and copper mineralisation makes it a very attractive target in the WA goldfields at a time of robust gold and copper prices.
Interestingly, Johnson was part of gold giant Newmont Corp’s early exploration and drilling work undertaken at Burns that helped establish the initial prospectivity of the area. BHP and Western Mining Corporation also had a crack around the Burns intrusion area in the 1980s and 1990s, respectively.
According to Lefroy, only a small part of the intrusion has been explored however and the company considers it a priority exploration target for an intrusion-related gold system that is similar in nature to the felsic intrusions at Mandilla Well, Hemi and Gruyere to name just a few.
The new Burns prospect area will see some drilling action later this year.
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