Gateway Mining intersects significant high-grade gold mineralisation at Gidgee

by Leena Thomas
Image: Gateway Mining Limited

Gateway Mining Limited (ASX: GML) has announced the intersection of significant high-grade gold mineralisation at shallow depths, including grades of up to 8.8g/t Au, from its maiden RC drill program at the Kashmir prospect within its Gidgee Gold Project in Western Australia.

GML reported that high-grade gold mineralisation was intersected in traverses 1km apart during the initial reconnaissance Reverse Circulation drilling campaign into the 1.8km long Kashmir gold-in soil anomaly.

The company said that significant intersections have been returned from structures within both mafic volcanics and veining within the granodiorite. Highlights include 2m @ 7.9g/t Au from 3m (mafic hosted); 1m @ 8.8g/t Au from 59m (mafic hosted); and 2m @ 1.6g/t Au from 105m (granodiorite).

GML noted that these mineralisation styles are consistent with those observed on the northwestern contact zone of the Montague Dome, which is the focus of the company’s exploration activities.

The Kashmir anomaly is located directly along strike from the 200,000oz Howards Gold Deposit (owned by Horizon Gold Limited).

The company said that the two sections of drilling represent the first effective testing of this south-eastern contact zone of the Montague Dome, and the discovery of high-grade mineralisation within fresh rock over such a wide distance – and directly along strike from Howards – is considered extremely encouraging.

GML said that a further 2km to the north of this recent drilling, the historical Yale Lock gold workings demonstrate the broader potential of the contact over an extended strike length.

The company said that these results continue to validate Gateway’s interpretation that the Montague Dome represents a major gold-mineralised system, as well as its strategy of aggressively exploring the Dome away from historically mined areas.

The company said that the exploration of this south-eastern contact area will now focus on identifying prospective areas for thickening and/or repetition of the key mineralised structures, as a precursor to the identification of a significant new gold deposit.

Gidgee project

The Gidgee Gold Project is located in the Gidgee district in the Archean Yilgarn Craton of Western Australia approximately 630km NE of Perth and 70km north from the township of Sandstone on the eastern central portion of the Gum Creek Greenstone Belt, of the Southern Cross Province.

Significant targets within the Gidgee project include Kashmir, Mafic Shear Zone, Whistler, Achilles, Stockwork, Montague-Boulder, and Airport. Kashmir is 1.8km long gold-in soil anomaly.

Drilling at Gidgee

The company had recently undertaken a 4,500m program testing several targets around the margins of the Montague Dome.

Gateway reported that the initial results from this program have now been reported from Whistler West and Kashmir targets with assays still awaited from a further 3 prospects.

Drilling at Kashmir

The maiden drilling program at Kashmir consisted of two sections spaced 1km apart designed to provide an initial reconnaissance test of the geochemical anomaly. A total of nine holes were drilled, spaced 60m apart along section, and were drilled to a nominal target depth of 120m.

High-grade results from Kashmir

The company announced that high-grade gold mineralisation was intersected in traverses 1km apart during the initial reconnaissance Reverse Circulation (RC) drilling campaign into the 1.8km long Kashmir gold-in soil anomaly.

Significant drilling results include GRC520: 2m @ 7.9g/t Au from 3m; GRC524: 1m @ 8.8g/t Au from 59m; and GRC522: 2m @ 1.6g/t Au from 105m.

GML said that the results from Kashmir are considered to be outstanding for this early stage of exploration at a greenfields target and continue to reinforce the potential to delineate a significant large-scale gold system at the Gidgee Gold Project.

The company said that the results confirm the presence of gold-bearing structures within the primary rock on the south-eastern contact of the Montague Dome. GML noted that no previous exploration has been effective at testing the bedrock on the south-eastern contact within Gateway’s tenure.

Gateway said that the widely spaced nature of the two drill traverses completed in this program indicates that they are mineralised over an extensive strike length, with the results in hole GRC520 confirming that they persist to near-surface.

The company noted that the presence of mineralisation on the south-eastern contact has nearly doubled the strike-length of prospective contact of the Montague Dome, when combined with area to the north-west.

Gateway said that it will now embark on additional exploration of this south-eastern contact. The company said that future work will include groundbased geophysical surveys and surface mapping to help narrow down and identify the optimal positions along this extensive 4km strike length of the south-eastern contact zone for increased thickness in the mineralised structures. These optimal positions would then be aggressively tested by further drilling.

What’s next?

The company said that ground based geophysics (SAM) is proposed to map the host structure and identify prospective dilational zones.

GML reported that it is also planning step-out RC drilling down dip and along strike of high-grade gold intercepts. The company said that the regional RC drilling is also planned to test along the interpreted contact position.

Management comments

Gateway’s Managing Director Peter Langworthy said: “Intersecting these sorts of grades 1km apart in our very first drill program within a 1.8km long gold anomaly is an extraordinary result! This shows the scale of the opportunity at Gidgee and highlights the vast range of targets we have across the project – from resource-growth opportunities at Whistler and Montague to vast new gold anomalies such as Kashmir which are wide open for new discoveries.

These important drilling results confirm our modelling of how prospective the Eastern Margin of the Montague Dome may be, effectively opening up a new 8-10km long gold trend that has basically never been explored before.

Significantly, we are seeing the same type of gold mineralisation, in the same rock-types, at Kashmir as we are seeing across our key resource areas on the western side of the Dome. This is an important development which supports our view that we are looking at a major gold system at Gidgee.

The next step at Kashmir is to develop follow-up programs of exploration for this area that will help us to vector into zones where the mineralising system is thicker and therefore the potential to delineate a major new deposit is increased. This work will continue in parallel with our current large-scale drilling programs on the western part of the dome.

Further results are expected in the next 1-2 weeks from the balance of the recently completed 4,500m RC program on the western side of the dome. RC drilling is scheduled to resume shortly with the 10,000m air-core program now in its final stages, and this will ensure a continued strong flow of results through to the end of the year.”