RIMFIRE PACIFIC MINING LIMITED — Regulatory Filings 2007

Sep 2, 2007

rimfire pacific mining nl a.c.n. 006 911 744

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Exchange Tower Suite 810 530 Little Collins Street Melbourne Victoria Australia. 3000

3[rd] September 2007 Company Announcements Platform Australian Securities Exchange

Telephone 61 3 9620 5866 Facsimile 61 3 9620 5822 e-mail: rimfire@rimfire.com.au website: www.rimfire.com.au

ENCOURAGING GRADES OBSERVED IN FIFIELD PLATINUM SOIL SAMPLING PROGRAM

The Company continues to make good progress with its exploration work programs within its Fifield Platinum project areas, and its Bingara Diamond project areas in NSW.

The highly prospective Platinum (Pt) in soil anomaly area, “Ebenezer[1] ” , approximately measuring 2 km x 2 km, located south of the Platina-Gillenbine work area, has shown encouraging Pt grade indications in the soil samples .

The preliminary petrology report on rock chips and heavy minerals recovered from auger samples taken from Horton Valley No.2 Pipe at the Bingara Diamond Project area confirms earlier field observations made during the discovery phase.

Highlights for the “Ebenezer” Pt Area at Fifield NSW

Estimated grades on some of the soil sample have indicated results in excess of 1g/t in a number of the samples and a high grade of 1.6g/t were observed (field binocular assessment) .

• This is on 100m spacing centres for 15kg sample sizes and represents a very encouraging result.

• A detailed topographic mapping survey over 8 square km has been commenced enabling “soil movement” and location to be correlated with the Pt in soil results tabulated and the known geology.

• An additional soil sampling program is currently in progress.

  • Lines will “infill” the “discovery survey” already conducted at “Ebenezer”.

  • The work will tune higher priority Pt areas within the anomaly for subsequent tighter soil line gridding, auger drilling and trenching.

• A ground gravity survey is now planned for the next quarter.

Highlights for the Bingara NSW Diamond Area

• Positive interim petrology results were received on Horton Valley No.2 Pipe and have confirmed earlier field observations.

  • The petrology has indicated “very high garnet” yields (in excess of 100 grains per kg of raw auger cuttings) and the structure is a likely “pipe” – further geochemistry is to follow.

• Radiometric data re-examination has identified additional targets for auger drill testing in the vicinity of Horton Valley No.1 Pipe and No.2 Pipe.

• New garnet indicator mineral has been identified 1km South of Horton Valley No.1 Pipe.

1 “Ebenezer” is the newly adopted name for the 2km x 2km platinum (Pt) in soil anomaly recently identified at Fifield NSW

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• Additional stream sediment samples have been taken at Trevallyn and are being processed.

• Geophysical “Sub Audio Magnetic” surveys (SAM) have been completed at Back Creek and Tom & Jerry South.

• An offer for grant of new exploration licences at Bingara has been received from DPI-NSW

  • These areas track regional geology identified as potentially similar to the geology of localities of Horton Valley No.1 Pipe and No.2 Pipe.

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DETAILED UPDATE ON THE “EBENEZER” PT IN SOIL ANOMALY

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----- Start of picture text ----- Platina-Gillenbine Work Area(bedrock exploration)Platina Deep Lead workings lookingwest from “Ebenezer”Ebenezer Pt Prospect(bedrock exploration)----- End of picture text -----

“Ebenezer” is located 500m SE of the Platina-Gillenbine work area. A major soil sampling program was conducted using 15kg sample sizes at 100m spacing centres. The results have demonstrated significant coarse grain Pt is present, with associated gold (Au) in some areas.

Pt grades in soil samples have been observed of more than 1g/t Pt, with a maximum grade seen to date of approximately 1.6g/t.[2] Other Pt estimated grades of interest that were noted included 0.8g/t and 0.24g/t. (The grade is highly dependent on the uneven statistical distribution of coarse Pt, and grade estimates would be more likely representative if larger sample sizes than 15kgs were used. Larger sample sizes will be used to define the most prospective areas for Pt, in due course, once regional coverage is completed).

2 As viewed and estimated by Rimfire under binocular microscope, and compared with a standardised scale for Pt & Au grains

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The Ebenezer prospect is approximately 2 km x 2 km , which is considered an extremely large precious metal soil anomaly. Given the large spaced sampling and the positive nature of the results obtained to date, the Company is very encouraged by the potential of the area.

The “Ebenezer” prospect area is characterised by poor creek development so regional soil sampling is essential to locate Pt and Au. A detailed topographic survey has been commenced to allow more accurate interpretation of the soil movements and drainages in the area. The land surface is almost flat and soil movement directions and drainages cannot be seen on aerial photographs.

A new program of soil sampling “infill lines” will be conducted EW across the prospect area, 200m apart, with 15kg samples taken on 100m spacings. This will secure 200 samples (3tonne). Based on the results of this sample program, further tighter sample grids will be conducted to tune the best Pt in soil areas.

A geophysical “ground gravity survey” has been planned covering “Platina-Gillenbine” and “Ebenezer” , and should be undertaken in the next quarter. This will assist the interpretation of the underlying geology, and could help indicate any deeper intrusive body that may exist.

The results represent Pt which is not derived from alluvium, but which is derived from residual or semi residual soils. It is postulated at this early stage that the Company may have encountered the complex “roof zone” of a major Pt bearing intrusive body within the “Ebenezer prospect”.

If evidence continues to mount and suggests that an important deep intrusive body is the likely Pt source for the soil anomaly, then some deep exploratory RC drill holes (>400m) would be proposed.

The regional soil sampling and rapid processing of these samples is proving an effective exploration method and has highlighted the enormous potential of the Fifield district for Pt. The 8km (SW to NE) corridor of potential Pt mineralisation is being explored with soil geochemistry, auger drilling and trenching, using the lessons learned at the focused work area at Platina-Gillenbine.

The Company will continue with its exploration work programs and processing of samples with a view to establishing the concept of the potential for a minable open cut mineralised corridor of the coarse grain Pt occurring within the bedrock at Fifield. A large corridor of mineralisation rather than a single lode is more likely to exist in the Company’s opinion.

DETAILS OF THE RECENT WORK ON THE BINGARA DIAMOND PROJECT

The Company has ongoing exploration field programs at its “Back Creek – Glen Idle Diamond Prospect” at Bingara NSW. The Company’s preliminary review of the samples processed at the Company’s facilities concluded that a probable new “Pipe” carrying large concentrations of key indicator minerals (garnets and ilmenite) had been identified at Back Creek Glen Idle . This was named the “Horton Valley No.2 Pipe”.

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----- Start of picture text ----- Garnets BC Hole 4 Crystal Fragments in Breccia? Garnets BC Hole 5BC Hole 4----- End of picture text -----

The Company isolated samples to have independent characterisation and confirmation of these field observations, in a similar way to the process it used as confirmation of the Horton Valley No.1 Pipe.

The preliminary petrology assessment, based on “binocular review”, confirms the likely status of a second “pipe” as having been discovered by the Company.

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A one kilogram sample of uncrushed bedrock vent breccia from each hole yielded in excess of 100 garnets from each of holes 4 and 5. This is a proportionally very high garnet content.

Microprobe analysis will be undertaken on the key indicator garnets, to determine the garnet chemistry. The chemistry profile will be a key indicator for the pipes suitability to potentially host diamond. Further auger drilling is planned within the pipe to increase the geological mapping, similar to that undertaken on Horton Valley No.1 Pipe.

Geophysical techniques, including Sub Audio Magnetics (SAM) and radiometric analysis have now been applied to the Horton Valley No.1 and No.2 Pipe localities to further characterise the geology associated with the pipes. The radiometric review has indicated 4 anomalies in the vicinity of the existing pipes , and these anomalies will be tested with auger drilling in the next quarter.

Once a suitable “diamond drill rig” is secured, it is planned to core drill the discovered pipes for geological interpretation and further enhance the knowledge of the pipes. An appropriate bulk sampling program would follow, to determine any contained diamond.

Fresh stream sediment and soil samples have now been taken at Trevallyn, and areas north and south of Horton Valley No.1 Pipe. Garnet indicators have been recovered and an attempt will be made to track these to their respective source localities, with the hope of establishing new pipe discoveries.

The Company is beginning to see a possible correlation within the geological setting at Bingara, enabling the higher ranking of prospective exploration sites, therefore potentially leading to further “pipe” discoveries. Accordingly, the Company has applied for more exploration licences within the Bingara area to follow its geological model. An offer for grant of these new licenses has been received from DPI-NSW.

Yours faithfully

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JOHN KAMINSKY Executive Chairman Rimfire Pacific Mining NL

The information in the report to which this statement is attached that relates to Exploration Results is compiled by Mr Colin Plumridge, who is

a Member of The Australian Institute of Mining and Metallurgy, with over 30 years experience in the mineral exploration and mining industry. Mr Plumridge is employed by Plumridge & Associates Pty. Ltd. Mr Plumridge has sufficient 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 Mineral Resources and Ore reserves”. Mr Plumridge consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.

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