Leonora

Anglo Australian Resources NL 100%

 

The Leonora Project is located 25 kilometres south of the Jaguar mine of Jabiru Metals Limited (Reserves: 3.23 Mt @ 1.8% Cu, 7.91%Zn, 99 g/t Ag, 0.4 g/t Au) and Jabiru’s Bentley deposit (3.0 Mt @ 2.0% Cu, 9.8% Zn, 138 g/t Ag, 0.7 g/t Au) (see Figure 1& 2). Both these deposits were discovered by drill testing bedrock electromagnetic conductors. These two volcanogenic massive sulphide (VMS) style deposits occur near the boundary between mafic and felsic units. The Leonora Project consists of two Exploration Licenses, located 10 km north of Leonora, which cover a 10 km long zone of felsic volcanics and sediments broadly analogous to the geology at Jaguar and Bentley. Based on interpretation of previous aircore drilling and of aeromagnetic data, Anglo Australian Resources considers 7km of this zone is highly prospective for VMS-style mineralisation.

 

Most previous exploration of the Leonora Project focused on the gold potential and aircore drilling defined two gold-anomalous zones. Holes in only two of the multiple traverses of aircore drilling were assayed for copper, zinc and lead. The hole nearest to and on the strike trend of the conductor is highly anomalous in copper, as it contains a 9m interval assaying 600ppm Cu within weathered basalt compared to background values of 40 – 60 ppm Cu.

 

As bedrock in the zone is mostly covered by younger transported sediments, the Company  used a MLEM survey as its primary exploration tool to search for VMS deposits that are generally highly conductive and amenable to location by such geophysical methods.  A Moving Loop Electromagnetic (MLEM) survey completed in May 2011 at the Leonora Project targeting potential massive copper-zinc mineralisation discovered a strong 800m long bedrock conductor. Sample spoils from previous aircore drilling indicated that the conductor was located within favourable stratigraphy proximal to the contact between felsic and mafic volcanic rocksPreliminary interpretation of  the MLEM anomaly by geophysical consultants, Southern Geoscience, suggested the source of the conductor, (potentially massive or disseminated sulphide), commenced at the base of weathering approximately 100m below surface and dipped steeply south west. The conductor presented an exciting and compelling drill target.

 

Two diamond core holes were completed in October as extensions to the pre collar holes completed in May. Both diamond core holes intersected a sequence of mafic and felsic volcanic and volcaniclastic rocks  with minor non-volcanic units. Trace to minor amounts of disseminated sulphides consisting of chalcopyrite, pyrrhotite and pyrite were observed in the core and a narrow zones of stringer chalcopyrite and pyrrhotite were intersected within a  foliated mafic intrusive in hole LRCD001.  Anomalous copper and zinc values supported by weakly anomalous values in antimony and tin were recorded in several of the intervals selected for assaying (see Table 3).  The best intersection comprised a 0.65 metre interval at 2.08% copper from 233.25 metres in hole LRCD001.  Narrow zones of black shale containing variable amounts of pyrite and pyrrhotite and minor amounts of chalcopyrite intersected in both holes most likely explain the source of the MLEM conductor.

 

A downhole EM survey was undertaken on each hole to define and confirm the conductive zone.  The survey is currently being analysed AAR’s consultant geophysicists. Preliminary analysis suggests a strong off hole conductor possibly related to massive sulphides has been detected in both holes. A strong in hole conductor is representative of the sulphidic black shakle hirizobs intersected in both holes ( see diagram "Down Hole EM. Results - A Component" in the Galleriy section).

 

Drill hole statistics and summary drill Logs  are presented in Tables 1 and 2 below. For a complete list of assays see AAR's September 2012 Quarterly Report.

 

Table 1

Drill Hole Statistics

Hole ID

MGA_E

MGA_N

Elevation

Precollar Depth

Total Depth

Azimuth

Dip

LRCD001

334050

6819887

500

110.6

381.3

60

-60

LRDC002

334132

6820276

500

116.5

375.3

240

-60

 

 

Table 2

Summary – Diamond Core Logs:

Hole LRCD001

From – To (metres)     Description

110.60 - 188.00           Mafic intrusives, medium grained gabbro. Intervals of bleaching and carbonate veining.

 

188.00  -213.77           Mafic intrusive with 2% chalcopyrite, pyrrhotite and pyrite and strong bleaching and carbonate veining.

 

213.77 - 214.00           Mafic intrusive with 7% disseminated and stringer chalcopyrite, pyrrhotite and pyrite.

214.00 - 224.60           Mafic intrusive with 2% disseminated chalcopyrite, pyrrhotite and pyrite.

224.60 - 230.64           Mafic intrusive, medium grained gabbro.

230.64 - 233.80           Mafic intrusive with 3 to 5% disseminated chalcopyrite, pyrrhotite and pyrite and 5% stringer chalcopyrite and pyrrhotite with abundant quartz carbonte veining from 233.23 and 233.80..

 

233.80 - 248.00           Fine to medium grained gabbro altered gabbro with quartz carbonate  veins.

248.00 - 256.90           Gabbro with 10% pyrrhotite and 5% chalcopyrite and fine to medium grained gabbro.

 

256.90 - 260.40           Intercalated basalt , black shale and tuff.

260.40 - 270.90           Felsic volcaniclastic and banded tuffs.   

270.90 - 284.20           Intercalated black shale, chert and felsic volcaniclastic.

284.20 - 285.28           Black shale with quartz boundins with 10% pyrrhotite and 1% chalcopyrite.

285.28 – 288.55          Felsic volcaniclastic with 5 % pyrrhotite, 1% chalcopyrite towards the base of the interval.

 

288.55 - 381.30           Felsic volcaniclastic. Minor basalt fragments. Minor disseminated pyrite. End Of Hole

 

 

Hole LRCD002

From – To (metres)                 Description

 

116.50 – 327.38          Units of basalt / andesite, moderate bleached with quartz carbonate veining and chloritic alteration alternating with felsic volcaniclastics weakly choritic in places and containing minor amounts of pyrite.

 

327.38 - 332.35            Black shale and felsic tuff. 7 to 15 % pyrrhotite and pyrite and up to 1% chalcopyrite.

 

332.35 - 359.33            Felsic tuff and lava.  5% pyrite and pyrrhotite and trace chalcopyrite from 332.35 to 337.30.

 

359.33 - 375.30-          Crystal Tuff.  End Of Hole