Preliminary results from Treasure Island near Kambalda grades up to 49g/t gold and 1% plus copper
- Focus strikes deal to acquire 75 per cent stake in the Lake Cowan gold-copper project on the southern extension of the Boulder-Lefroy Fault system in WA’s Eastern Goldfields
- Recent surface outcrop and gossan sampling returns stunning gold mineralisation grading up to 49g/t gold and 1% plus copper
- A detailed geophysical survey and planning for field work underway to identify drill targets
Gold producer Focus Minerals (ASX: FML) is pleased to announce it has reached agreement to acquire a 75 per cent stake in the Lake Cowan gold-copper project (Treasure Island) near Kambalda in WA’s Eastern Goldfields, where surface reconnaissance exploration has produced grades of up to 49g/t gold and 1% plus copper.
Treasure Island sits on the southern extension of the Boulder-Lefroy Fault, which hosts numerous high-grade gold and nickel deposits, including the Kalgoorlie Super Pit and the recently discovered high-grade Athena gold deposit.
The lease covers 95km2 and is located approximately 50km southeast of Kambalda with surface sampling coming predominantly from an island that sits within Lake Cowan (See Figure 1 and Figure 6).
The structural setting, local geology and identified gold and copper mineralisation is similar to that found at the historic Paris mine, located 8km to the north (see Figure 1). The Paris mine produced approximately 22,000 ounces of gold at an average grade of 11.1g/t.
Under the terms of the agreement, Focus will acquire a 75 per cent stake in the Lake Cowan Project by issuing 3 million fully paid Focus shares to Semro Pty Ltd and spending $200,000 on exploration over the next 12 months.
Based on the historical and reconnaissance exploration results, Focus believes the Lake Cowan region offers immense potential and has begun planning for a detailed aeromagnetic survey in conjunction with geological mapping and rock chip sampling to identify targets for drilling
Semros initial reconnaissance surface sampling was for the purpose of gold exploration with initial lab analysis having an upper copper threshold of one percent. Two samples assayed during this program recorded grades of >1% copper. Subsequent site visits by Focus Minerals to the outcropping island and obvious physical evidence of copper mineralisation (see Figures 2, 3, 4) has resulted in Focus Minerals conducting preliminary analysis using a Niton hand held XRF analyser.
The Niton XRF analysis of a number of core and gossan samples gave results of up to 40% copper (see Figures 2, 3 & 4). While Niton XRF analysis is not considered a substitute for conventional analytical methods the results do give an indication as to the potential copper grades in the area, the samples are being submitted for comprehensive laboratory analysis.
Background and History
Initial rock chip sampling on the island in the early 1990s by Renton Holdings encountered anomalous malachite stained quartz carbonate vein system with values up to 7g/t gold. Renton planned to follow up with drilling; however it was unable to get a rig onto the island due to the weather.
The Lake Cowan project was acquired in 1994 by ASX listed company Welcome Stranger, which carried out additional geochemical and chip sampling (Table 2) as well as detailed mapping of the island (Figure 6) to validate previous work. The mapping on the island delineated a north-south shear with associated 290-310° trending quartz carbonate veins. Gossanous ironstones and malachite and azurite staining within the area appear to be associated with the quartz carbonate veining. The shear is located on the contact of a gabbro and volcanic exhalative shale dolomite sequence and is approximately 40 metres wide. The sequence has been intruded by small dolerite bodies. Results from the rock chip sampling returned assays of up to 6.4g/t gold and 7.4% copper. The wide spaced soil geochemical sampling program undertaken by Welcome Stranger identified a wide anomalous gold zone. The area of copper mineralisation is on the northeastern shore of the island and was not included in the soil sampling program.
Welcome Stranger also attempted to drill test the anomalies. After several attempts to get a rig to the location over a three year period, a small RC rig was mobilised to the island and drilled 12 holes to a maximum depth of 30 metres. The rig could only get to within 50m of the island due to water. Eight of these holes were drilled parallel to the shear structure and missed the mineralisation. The remaining four intersected the structure and encountered anomalous copper and zinc.
A local group of prospectors (Semro Pty Ltd) claimed the lease in late 2007 and has since conducted rock chip sampling and geochemical sampling which revealed anomalies in gold and copper (See Table 1).
Focus Chief Executive Officer Campbell Baird said Focus Minerals was very excited about the Lake Cowan Project.
“It is early days and there remains a lot of exploration work to be done,” Mr Baird said.
“However the grades from historical fieldwork and recent reconnaissance are incredibly exciting and we look forward to fully exploring what appears to be a highly mineralised copper-gold project.”