Percyvale - Base Metals, Gold and Uranium
The Percyvale Project is located approximately 300 kilometres west northwest of Townsville in North Queensland and was applied for in February 2007. The EPM covers 363 square kilometres and was granted to Glengarry in April 2008.
The Project area is underlain by lithologies belonging to the Proterozoic Einasleigh Metamorphic suite, the same geological sequence that hosts the Kidston gold deposit, the Maitland copper deposit, the Maureen uranium-molybdenum deposit and Copper Strike’s Einasleigh, Kaiser Bill, Chloe and Jackson base metal deposits.Previous exploration by other companies identified a number of prospective areas and these have been the focus of Glengarry’s initial exploration work.
Bernadette Prospect
A 2.5 by 1 kilometre long, northeast trending zone containing strongly anomalous copper, gold and silver has been defined by soil and rock sampling at the Bernadette prospect. Limited bedrock channel sampling has been carried out where outcrop exposure is sufficiently continuous. Better results include:
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5 metres @ 1.1% copper, 2.6 g/t gold and 42 g/t silver
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3 metres @ 4.23% copper, 1.04 g/t gold and 24 g/t silver
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5 metres @ 2.2% copper, 4.5 g/t gold and 14 g/t silver
Additional rock chip samples elsewhere at Bernadette have also recorded high grade copper, gold and silver values that warrant further exploration. Strongly elevated levels of zinc, lead and molybdenum are associated with the mineralised trend.
The geological setting at Bernadette is complex and several styles of mineralisation have been observed. The channel results are hosted by malachite (copper carbonate) stained, strongly ferruginous material interpreted to be after primary sulphide mineralisation. Gold-silver mineralisation has also been recorded in a number of parallel quartz veins up to 1 metre thick and 200 metres long.
An isolated occurrence of secondary, high grade uranium mineralisation reported by previous explorers on the north western margin of the prospect area has been confirmed by Glengarry sampling. The potential for economic uranium mineralisation at Percyvale was last assessed in the 1970s and is yet to be fully evaluated by Glengarry.
In November 2008 a 9 hole drill program was completed at the Bernadette prospect with better results including:
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08BNRC002; 3 metres @ 6.67g/t Au
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08BNRC003; 60 metres @ 0.17 g/t Au
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08BNRC004; 60 metres @ 0.18g/t Au
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08BNRC005; 2 metres @ 0.83g/t Au and 1.15g/t Ag
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08AZRC001; 3 metres @ 7g/t Ag, 0.4% Cu and 3.9% Zn
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08AZRC002; 7 metres @ 0.3g/t Au, 22g/t Ag, 2.0% Cu and 0.5% Zn
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08AZRC003; 3 metres @ 0.4g/t Au, 13g/t Ag, 1.2% Cu and 0.15% Zn
Maggies Prospect
At Maggies, follow up of previous rock chip and soil sampling carried out by BHP (1994-1995) and Rio (2004-2006) has identified a northwest-southeast trending gossanous (ex-sulphide) horizon up to 16 metres thick and over a strike length of at least 1 kilometre. Soil sampling has delineated a strong copper anomaly coincident with the gossanous horizon and a composite rock chip sample across the sub cropping, thickest part of the unit recorded 15.9% copper, 0.32 g/t gold and 11 g/t silver.
At Maggies, two reverse circulation percussion drill holes for a total 279 metres were drilled to test the identified soil anomaly.
The drilling at Maggies failed to intersect any significant base metals, gold values or sulphide mineralisation and no immediate follow up is planned.
The extent of the gossanous material at surface is significant and geophysics designed to detect buried sulphide mineralisation may be considered as part of any follow up exploration work carried out at Bernadette.
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Bernadette Prospect - Soil and Rock Chip Geochemistry |
Maggies Prospect - Soil Geochemistry |
Black Soil Creek Prospect
Previous exploration by BHP defined extensive Broken Hill style base metal and silver anomalism coincident with a strong, conductive EM anomaly. This geochemical anomalism has been validated by check sampling completed by Glengarry. Limited drilling by BHP intersected moderate zinc-lead-copper-silver mineralisation (up to 6.8 metres @ 1.5% Zn, 0.1% Pb, 0.24% Cu and 11.5 g/t Ag); however, potential for the discovery of an ore body large enough to meet BHP’s criteria was downgraded.
BHP’s drilling appears to have focussed on the strongest part of geochemical anomalism which would be influenced by outcrop exposure and not necessarily reflect the best mineralisation. Reprocessing and reinterpretation of the EM data indicates a number of conductors that have not yet been drill tested. These conductors may be defining massive sulphide horizons containing high grade base metal mineralisation.Two reverse circulation percussion drill holes for a total 330 metres were drilled at Black Soil Creek.
Glengarry’s drilling intersected broad zones of low grade silver-copper-zinc mineralisation (up to 27 metres @ 4 g/t silver, 0.2% copper, 0.6% zinc) associated with massive pyrrhotite (iron sulphide) horizons; however, the results do not warrant follow up drilling. The observed sulphide mineralisation adequately explains the geophysical anomalies.