GATEWAY MINING LIMITED — Regulatory Filings 2013

Sep 11, 2013

ABN: 31 008 402 391 Level 8, 210 George Street Sydney NSW 2000 GPO Box 225 Sydney NSW 2001 Tel: 61 2 9191 4543 Fax: 61 2 8247 7999 Website: www.gatewaymining.com.au

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12 September 2013

MLTEM Survey Results from The Cup _

Highlights:

• Multiple MLTEM Conductors identified at The Cup, which correspond to excellent gossan geochemistry and previous ore-grade sulphide copper intersections

• Review of The Cup area shows potential for a very large VMS Copper deposit

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The Company is very pleased to have received results from its recently completed MLTEM survey at the area surrounding The Cup VMS mineralisation. The results represent a significant change in interpretation for The Cup, which has major upside implications should the Company’s model hold true.

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The Cup &
Tenement
M57/633 –
recent JV
Tenement
(MLEM)
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Figure 1
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MLTEM Conductors at The Cup

The MLTEM survey identified multiple conductors at The Cup. The conductive horizon at The Cup extends southwards onto the tenement M57/633. Gateway recently entered into an agreement whereby it can earn 70% of the tenement (see ASX announcement 12 August, 2013).

ABN: 31 008 402 391 Level 8, 210 George Street Sydney NSW 2000 GPO Box 225 Sydney NSW 2001 Tel: 61 2 9191 4543 Fax: 61 2 8247 7999 Website: www.gatewaymining.com.au

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In what is an extremely encouraging sign, these conductive horizons at The Cup correspond to previously intersected gossanous material and ore-grade copper mineralisation identified along the tenement boundary. The horizons dip westward into the new Joint Venture tenement, suggesting that mineralisation may extend down-dip. Further drilling is planned to test these down-dip extensions across the boundary with M57/633 very shortly.

Plan view of interpreted MLTEM conductors

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Figure 2
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Review of The Cup prospect

The Cup area has the potential to host a very large copper / base metal deposit. The Cup is host to Volcanogenic Massive Sulphide (VMS) mineralisation which occurs very close to the tenement boundary with tenement M57/633. Gateway has entered into an agreement whereby it can earn 70% of M57/633.

ABN: 31 008 402 391 Level 8, 210 George Street Sydney NSW 2000 GPO Box 225 Sydney NSW 2001 Tel: 61 2 9191 4543 Fax: 61 2 8247 7999 Website: www.gatewaymining.com.au

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Much of the historical work completed by Gateway has focused on ‘The Cup’ horizon, however the Company now believes there is an additional, more significant ‘horizon’ lying above The Cup which dips west into M57/633 . This model is based on the exceptional gossan geochemisty which has been intersected along the tenement boundary, the recently completed MLTEM surveys, and the surrounding geology. The gossan, which is an iron-oxide rich ‘cap’ on top of a massive sulphide body, has returned Cu to 17,829ppm and Au to 4.73g/t . This level of copper and gold in a gossan is exceptionally high. Visible malachite , a copper carbonate, was also evident during historical drilling, which is a further sign of base metal fertility.

Furthermore, in what is an extremely encouraging sign, this new horizon, The Chalice, has very strong Pb results. Lead is one of the most important elements in the detection of VMS mineralisation. Pb to 1,484ppm has been intersected in gossan , which is an outstanding result.

Cross-section: 6968000N

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Figure 3

ABN: 31 008 402 391 Level 8, 210 George Street Sydney NSW 2000 GPO Box 225 Sydney NSW 2001 Tel: 61 2 9191 4543 Fax: 61 2 8247 7999 Website: www.gatewaymining.com.au

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The presence of other extremely strong VMS multielement anomalism in the gossan lends further support for the Company’s interpretation of the mineralisation: Bi to 4.47ppm, Mo to 11.6ppm, Sb to 52ppm, Se to 56ppm, Sn to 60.6ppm, and Te to 29.1 . This level of anomalism is significantly above background levels, and indeed well above Gateway’s internal thresholds for geochemical anomalism.

The Chalice horizon has significantly more favourable geochemistry than The Cup horizon, which has historically intersected ore-grade copper over significant widths (e.g. 27m @ 1.42% Cu from 89m in GRC200). The gossan corresponding to The Chalice is far more impressive than the gossan corresponding to The Cup . This leads to the interpretation that The Chalice horizon could be the primary VMS horizon in this system, and hence contain the strongest copper grades.

The recently completed MLTEM surveying mentioned above confirms the westerly dip of both The Cup and The Chalice horizons into the new Joint Venture tenement M57/633.

This same gossan has now been intersected over a confirmed 100m strike length, on the 6967950N, 6968000N and 6968050N lines and it is open in both directions. A review of historical drilling suggests it may have been intersected further north however additional drilling is required to confirm historical results.

Cross-section: 6967950N

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Figure 4

ABN: 31 008 402 391 Level 8, 210 George Street Sydney NSW 2000 GPO Box 225 Sydney NSW 2001 Tel: 61 2 9191 4543 Fax: 61 2 8247 7999 Website: www.gatewaymining.com.au

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Cross-section: 6968050N

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Figure 5

With respect to the broader geological setting, the location of The Cup / The Chalice appears to be an ideal location for a VMS deposit as it is proximal to the Montague Granodiorite (see Figure 7). It appears that the Montague Granodiorite is a subvolcanic intrusion that is co-magmatic with the volcanics in the greenstone package. This was also probably the source of the heat which drove the VMS mineralisation. Further, the chemical composition of the Granodiorite is very similar to other subvolcanic intrusions associated with this style of VMS.

Large subvolcanic intrusions are a key feature of many of the significant VMS districts around the world . This bodes extremely well for not only The Cup & The Chalice, but also for the prospectivity of the rest of Gateway’s tenement holdings in the area.

The Cup and The Chalice lie approximately 2.5km northeast of the intrusion.

ABN: 31 008 402 391 Level 8, 210 George Street Sydney NSW 2000 GPO Box 225 Sydney NSW 2001 Tel: 61 2 9191 4543 Fax: 61 2 8247 7999 Website: www.gatewaymining.com.au

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The gossanous intersections and ore grade copper intersections referred to above also correspond to a very significant magnetic feature on the new Joint Venture tenement, M57/633.

Magnetic survey location of Cup / Chalice

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Figure 6

ABN: 31 008 402 391 Level 8, 210 George Street Sydney NSW 2000 GPO Box 225 Sydney NSW 2001 Tel: 61 2 9191 4543 Fax: 61 2 8247 7999 Website: www.gatewaymining.com.au

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The magnetic feature requires further work to understand its nature; however it is very peculiar that the eastern edge of the feature corresponds extremely well to previous sulphide intersections and previous MLTEM surveys. Comparing the outline of the eastern edge of the magnetic feature in Figure 6 above with the previously identified MLTEM conductor shown in Figure 2 (on page 2), shows a very strong correlation i.e. the outline is almost identical. This could potentially suggest a direct relationship between the magnetic feature and sulphide mineralisation, and/or formational stratigraphic horizons, which would be an extraordinary development for the prospect given the large size of the magnetic feature.

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Figure 7

ABN: 31 008 402 391 Level 8, 210 George Street Sydney NSW 2000 GPO Box 225 Sydney NSW 2001 Tel: 61 2 9191 4543 Fax: 61 2 8247 7999 Website: www.gatewaymining.com.au

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Further drilling

Holes have been planned to test the down-dip extensions of The Cup and The Chalice VMS mineralised horizons. A further announcement will be made shortly detailing the location of the planned holes. It is expected that these targets will be drilled during the first half of October, 2013.

Further updates will be provided to the market in due course

About Gateway Mining Limited

Gateway holds approximately 150sqkm of tenements over the Gum Creek Greenstone Belt in the Yilgarn Craton, Gidgee WA (600km NE of Perth). The tenements have all the hallmarks of a significant new VMS province, along with existing gold mineralisation throughout the project. The Company is well funded and plans to test a large number of highly prospective targets over the remainder of 2013. Gateway also has in place a very experienced management and technical team.

The information in this report that relates to Exploration Results, Mineral Resources or Ore Reserves is based on information compiled by Mr Scott Jarvis, the Head Geologist at Gateway Mining, a member of the Australian Institute of Geoscientists. Mr Scott Jarvis has a minimum of 5 years’ experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2004 Edition of the “Australian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Mr Scott Jarvis consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.