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Gum Creek East Gold Project


The Gum Creek East project tenements are located approximately 700kms north north east of Perth and 600 kms north north west of Kalgoorlie Boulder in Western Australia in the East Murchinson Mineral Field. Access to the tenements is provided by the Yeelirrie - Meekatharra gravel road 75 kilometres north of the Leinster road on the Leonora-Meekatharra highway. From a road junction 20kms east of Youno Downs station a road heads north for 25kms to the PSI - Omega mine site area and from this point the Gum Creek prospect can be reached.

Gum Creek East Geology

The Gum Creek East tenements are situated at the north eastern end of the Gun Creek Greenstone belt which extends a distance of about 110 kilometres with an average width of 20-25 kilometres. The belt is a NNW striking southerly plunging syncline with an axial plane dipping east. The synclinal geology is complicated with the occurrence of a series of strike parallel secondary faults which has created several localised anticlinal structures within the larger synformal structure. This significant deformation has pushed up the older mafic volcanics along the axial planes of tight anticlinal structures. One proven and important anticlinal structure at the southern end of the greenstone belt is the Gidgee Anticline which hosts several operating gold mines. A simplified regional aeromagnetic image shows a strong magnetic signature associated with structures and mafic sediment stratigraphy in the Gum Creek East sector of the greenstone belt.

The Gum Creek East Prospect appears to be the eastern limb of a secondary anticlinal structure dipping steeply to the east. However it appears that the prospect is enclosed by a secondary anticline or the western limb of a similar syncline (after Szoke 2003). Szoke indicated in his report that regionally there are 3 well defined shear zones covering the entire length of the Gum Creek greenstone belt. These are the Wilson Shear Zone, the Victory Well Shear Zone and the Gidgee Shear Zone. The three shear zones are host to several gold mines including the Gidgee mine (Gidgee Shear Zone) and Montague, German Well mines (Victory Well Shear) to the south; and the Wilsons underground mine, the Omega-PSI and Toedter mines (Wilsons Shear Zone) in the north. Szoke’s interpretation is that the gold mineralised mineralised shear zone on the Gum Creek East prospect is the extension of the Victory Well Shear which has been offset two to five kilometres east by the Wilson Shear.

At the Gum Creek prospect gold is present in BIF and quartz veins within mafic rocks near the eastern margin of the greenstone belt. In addition to the main BIF horizon there is a number of smaller discontinuous BIF’s in the hanging wall and footwall rocks. The main BIF is traceable for over 450 metres and it has a true thickness up to a maximum of 10 metres. The BIF strikes at 20 degrees and dips steeply at approximately 80 degrees to the east. Magnetic data indicates this strike is maintained appears to be disrupted by a NW-SE fault.

Previous Exploration at Gum Creek East Project

Briefly the prospect area was acquired by Intercontinental Gold and Minerals NL (IGM) in 1987. Gridding of the exposed BIF was carried out with a baseline running down the main outcrop. IGM conducted rock chip sampling of the main BIF; soil sampling, geological mapping, colour aerial photography and a ground magnetic survey of the tenement holding.

In 1988 IGM conducted an RC drilling programme designed to investigate the sulphide bearing main BIF which rock chip sampling had indicated was carrying significant gold values. Thirty intersections of the main BIF on 16 lines returned grades above 0.5g/t over one metre but only two were over 2.0g/t gold with 1m @ 4.96g/t in hole GC14-1 and 3m @ 3.54g/t gold in GC18-1. One hole (GC14-3) east of the shaft returned assay values ranging from 49.8g/t to 116g/t gold over a 1m interval from 44-45metres down hole and about 4 ounces of gold is reputed to have been panned from the remaining drill cuttings. This intersection is not in the main BIF but may be on another BIF in the hanging wall or could be a vein of a different structure.

In 2002 the Gum Creek Gold syndicate financed a small drilling programme to determine if the high grade intersection in GC14-3 had sufficient extent to warrant a minng operation. Four holes GC_A, GC_B, GC_C GC_D with the same orientation as GC14-3 were drilled with the collars spaced 5 metres west, east, north and south respectively from the collar of GC14-3. It was concluded that the high grade intersection made in hole GC 14-3 is of limited extent and to small to warrant a mining operation. However it was noted that the ultramafic units were not distinguished from mafic units in the original logs and that numerous shear zones are present particularly in the ultramafic units. It was also indicated that east of the main BIF the geology has been disrupted by shearing and that east-west faulting was likely to have occurred. A fifth hole was drilled approximately 10 metres south of the shaft in the main BIF horizon. This vertical hole returned significant assay results at a shallow depth.

Recent Interpretation

The prospect was visited during October 2012. Mapping in the shaft area (north-south and east approximately 300 metres) indicates that the high grade gold mineralised shoots in a NNE shear zone hosting BIF horizons appear to be structurally controlled by a series of east-west (80-110 degrees) fault structures.

These E-W fault structures create a dislocation in the NNE shear zone and are seen at a scale (approximately 5-10 metres) north and south of a 30 metre deep shaft and south of drill hole 21-1. At the shaft area a strong dislocation in the NNE shear is widened to an east-west ferruginous siliceous outcrop approximately 150 metres to the east. A series of crosscutting quartz veins (over 10 metres wide) to the east of the shaft area strike approximately east-west.

The high grade gold intersection in hole E to the west of the shaft suggests that the main east-west structure extends through to the footwall side of the dominant NNE trending shear zone. Similarly east-west structures evidenced by quartz veining, disruption to the outcropping BIF horizon and creek directions indicates that east-west trending structures are located where drilling has intersected high grade gold mineralised shoots. Therefore the ore structure model is of a NNE trending mineralised structure, intersected by east-west structures forming high grade gold mineralised dilation and shoot structures.

The east-west cross structures appear to be subvertical to flat with a dip direction to the south. Thus the high grade shoot could also be relatively flat (30-40 degrees) or subvertical to the south depending on the dip of the cross cutting structure where the intersection with the NNE shear zone occurs.

Drilling could therefore be vertical and sited on the east side of the NNE shear zone. More likely a drill collar should be sited south-east of an intersection of the NNE Shear zone and a cross cutting structure; inclined at -60 degrees and with an azimuth of 315 degrees. This drilling is designed to intersect a south-east dipping, south plunging ore shoot.

Contact Prospect Promotions or Arnie Eriksson Mob: 0458 522226

Gum Creek East Brochure.pdf

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