Jillewarra Gold & Base Metal Project

S2 is earning a majority interest in the Jillewarra project, located in the Murchison Goldfields, 50km west of Meekatharra in Western Australia.
The project covers 791.5km2 and 40 strike km of the Mingah Range Greenstone Belt, including the historical Chesterfield and Wardabie mining centres. Although the project area has been subject to intermittent prior exploration, drilling is of limited extent, effectiveness, and depth, and the exploration potential is high.

Setting of Jillewarra Project

Geology

The Jillewarra Project covers the WNW trending Archean Mingah Range greenstone belt, which is 50km long and 9.5km wide. It comprises a sequence of basalt and fine-grained amphibolites, felsic and intermediate volcanics, shale and siltstones, intruded by layered gabbroic sills, metamorphosed to greenschist facies, and is variably deformed, particularly adjacent to the major structures.

The geology can be characterised by three main lithological groups, typical of Archaean Yilgarn greenstone sequences:
• A basal sequence of mafic to ultramafic extrusive rocks (high-mg basalt, basalt and ultramafic units and minor intrusives)
• An upper sequence of a mixed package of felsic volcanics, sediments, sedimentary iron formation (SIF) and minor mafic volcanics.
• Both sequences have been intruded by a series of differentiated mafic-ultramafic sills that appear to have preferentially intruded the upper volcano-sedimentary sequence. The intrusive sills are characterised by a peridotite-pyroxenite base overlain by a thicker unit of gabbro.

Project area, showing historical workings and greyscale aeromagnetic imagery

Gold Prospectivity

The project includes a number of areas of significant historical mining activity and numerous gold occurrences. The Chesterfield Mining Centre included producers like: Big Ben, Little Ben and Cashman’s Reward to the north and Dorothy and Margueritta Mines to the south.

Dorothy Prospect

Comprises narrow, sulphide rich quartz veins that dip to the southwest and plunge to the South, that have been drilled in the immediate area of historic mining activity but only to an effective depth of 70m below surface. Virtually untested along strike to the NW where hardpan and cover meant prospectors had no success.

The Dorothy prospect is open down plunge to the south having been poorly tested by only three deeper step out holes down dip but not down plunge. Better results include:
• 3 metres @ 40.9 g/t gold from 29 metres in DO018
• 4 metres @ 33.8 g/t gold from 33 metres in CHER16
• 4 metres @ 33.3 g/t gold from 35 metres in CFC044
• 9 metres @ 21.0 g/t gold from 45 metres in CFC058
• 8 metres @ 9.2 g/t gold form 57 metres in CFC057
• 8 metres @ 7.9 g/t gold from 72 metres in CFC001, and
• 1.8 metres @ 69.2 g/t gold from 73.3 metres in CHERD30 (*diamond hole)

Margueritta

Located approximately 1.5 km southeast of Dorothy along the same structural corridor, mineralisation comprises two sub parallel lodes, dipping to the northeast and plunging shallowly to the north, drilled to a maximum vertical depth of only 60m.

Better results from historical RC drilling of the East Lode include
• 5 metres @ 6.1 g/t gold from 22 metres in RC002
• 4 metres @ 5.8 g/t gold from 32 metres in CFC008
• 3 metres @ 6.1 g/t gold from 21 metres in CFC007
• 2 metres @ 5.6 g/t gold from 35 metres in CFC050

Better results from historical RC drilling of the West Lode include:
• 5 metres @ 5.9 g/t gold from 38 metres in CHERC5
• 3 metres @ 7.2 g/t gold from 49 metres in RC004

Mineralisation remains open at depth and down plunge.

The trend containing the Dorothy and Margueritta prospects is essentially untested at a depth greater than 100 metres and hardly drilled outside of the immediate environs of the historic workings. Limited RC drilling approximately 300 metres south of the Margueritta prospect has also intersected gold mineralisation, including 4 metres @ 5.2 g/t gold from 74 metres in hole CFC013.

Plan view of Dorothy/Marguertiee workings

 

Long projection of Dorothy Drilling
Long projection of Margueritte drilling

Base Metal Prospectivity

At a district scale, the project is located midway between the Tier 1 Golden Grove Zn-Cu-Au mine and the high grade DeGrussa Cu-Au mine.

The project area contains felsic volcanic stratigraphy considered prospective for VMS style mineralisation, and several coincident multi-element (Cu-Zn-Pb-Ag) soil anomalies such as those at the Woods and Selga-King localities. This prospectivity is further enhanced by the presence of a cluster of untested non-stratigraphic electromagnetic (EM) conductors up to 800 metres long, barite occurrences, and even an occurrence of galena (lead sulphide) found at a depth of 80 centimetres below surface by prospectors whilst metal detecting for gold.

Overview of VMS prospectivity

Detail of non-stratigraphic EM conductors


Photo Gallery