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TriAusMin TriAusMin Tri Origin Minerals Ltd. Tri Origin Minerals Ltd. Corporate Overview Corporate Overview TSX: TOR June 2010 ASX: TRO ASX: TRO TSX: TOR June 2010 Disclaimer The Information contained in this presentation has been

  1. TriAusMin TriAusMin Tri Origin Minerals Ltd. Tri Origin Minerals Ltd. Corporate Overview Corporate Overview TSX: TOR June 2010 ASX: TRO ASX: TRO TSX: TOR June 2010

  2. Disclaimer The Information contained in this presentation has been prepared using the information available to TriAusMin at the time of preparation. This presentation contains forward-looking statements that were based on expectations, estimates and projections as of the date of this presentation. Any forward-looking statement is subject to known and unknown factors which may cause actual results and developments to materially differ from those expressed by, or implied by the forward-looking statements in this presentation. External or other factors may have impacted on the business of TriAusMin and the content of this presentation since its preparation. TriAusMin does not undertake to update any forward-looking statements that are contained in this presentation, except in accordance with applicable securities laws. In addition, this presentation may not include all relevant information regarding TriAusMin. TriAusMin has taken all reasonable care in preparation of this presentation. However, the content of this presentation should not be relied upon in relation to any further action including investment in TriAusMin. Any person considering an investment in TriAusMin is advised to obtain independent financial advice prior to making an investment decision. Nothing in this presentation should be construed as to constitute an offer, invitation or recommendation to subscribe for, sell or purchase any security in any jurisdiction. Further information about TriAusMin is available at: www.triausmin.com 2

  3. Overview TriAusMin – the registered Canadian trading name of Tri Origin Minerals Ltd is an Australian base and precious metals exploration company with assets located in the Lachlan Fold Belt of New South Wales. TriAusMin recently listed on the TSX (TOR) and continues to be listed on the ASX (TRO). • Strong land position with 70,300 hectares of leases in highly prospective Lachlan Fold Belt – a world class gold and base metals province • Significant but undervalued resources delineated at Woodlawn and Lewis Ponds • Near term exploration upside potential from drilling for resource extensions and repetitions of known deposits at both Woodlawn and Lewis Ponds • Positive economic return indicated from completed Feasibility Study at the Woodlawn Retreatment Project • Corporate restructuring completed to improve shareholder value 3

  4. Corporate History • Incorporated in 1993 in New South Wales as wholly owned subsidiary of Tri Origin Exploration Ltd (“TOE”) • Listed on the ASX in 2004 (ASX: TRO) • On January 22, 2010, shares listed on TSX (TSX: TOR); trading as TriAusMin • Listing will provide access to the world’s leading stock exchange for junior mining companies • TOR has a solid following in the Canadian market through TOE’s ownership 4

  5. Capital Structure • Shares outstanding: 116,724,734 • Tri Origin Exploration owns 25% of TriAusMin (“TOR”) • Market Capitalization as at June 9, 2010: A$ 8.2 million • Share structure: • Australian registry ~53 million (45%) • Canadian registry ~35 million (30%) • Tri Origin Exploration Ltd. (“TOE”) ~29 million (25%) Total ~117 million (100%) • Net available cash A$ 0.85 million* *As of March 31, 2010 5

  6. Board & Management William Killinger AM, Chairman Co-Founder of Minproc Engineers Engineer with over 40 years experience with international engineering firms Dr. Robert Valliant, Executive Director and CEO Co-Founder of TOE and TRO Formerly VP Exploration LAC Minerals Ltd Jeffrey Quartermaine, Director CPA and has held senior finance roles within a number of ASX listed resources companies Alan Snowden ICD.D, Director Over 30 years experience in Canadian and International financial markets and was Director of Western Canada for BMO Nesbitt Burns Calin Scott, CFO and Company Secretary Former Manager, Mining & Energy Services PKF (Sydney) 6

  7. New England Fold Belt The Lachlan Fold Belt: A world-class mineral province • Major producer of gold, copper, TRO Projects lead, zinc and silver Lachlan Fold Belt • International mining firms including Barrick Gold Corp., Newmont Mining Corporation, Newcrest Mining Limited and Goldfields Limited have an active presence in the belt • Largely under-explored using modern exploration techniques AGSO, 2005 7

  8. Major Mineral Assets in the Lachlan Fold Belt • Woodlawn Mining District (100% owned) • Woodlawn Underground Resource • Woodlawn Tailings Retreatment • Exploration leases and claims total an area of 55,000 hectares • Lewis Ponds Project (100% owned) • Exploration leases and claims total an area of 7,300 hectares • Portfolio of prospective exploration tenements throughout Lachlan Fold Belt 8

  9. Woodlawn has a Significant Mining History • Located 200km SW of Sydney • TRO controls mineral rights to an extensive land position at Woodlawn including the past-producing Woodlawn mine (mill has been dismantled) • Woodlawn district produced ~13 million tonnes of copper/zinc/silver/gold ore from 1978 to 1998 OPEN CUT 9

  10. Underground Mineral Resource Woodlawn Underground - Resources Category Tonnes Grade Contained Metal Gold Silver Copper Lead Zinc Gold Silver Copper Lead Zinc (g/t) (g/t) (%) (%) (%) ('000 oz) ('000 oz) ('000 lb) ('000 lb) ('000 lb) ('000) Measured 3,600 0.5 85 1.80% 4.00% 10.40% 61 9,838 142,860 317,466 825,411 Indicated 5,000 0.6 84 1.80% 4.00% 10.20% 88 13,503 198,416 440,925 1,124,358 Measured & Indicated 8,600 0.5 84 1.80% 4.00% 10.28% 150 23,341 341,276 758,390 1,949,768 Inferred 1,500 0.6 87 1.70% 4.10% 9.60% 29 4,196 56,218 135,584 317,466 Note: Based on 7% zinc equivalent cut-off grade Woodlawn Block Model – Looking North West 10

  11. Main System Long Section and Targets • Previous mining extended to only 600 m below surface Projected down plunge continuation of • 8 Mt extracted from open pit (to mined ore bodies 200m depth) Deep drill hole target • 5 Mt extracted from underground (200 to 600m depth) • 10 Mt remain in resource (200 to 600m depth) • Historic deposit totals 23 Mt to 600m depth and is open at depth • Minimum Target = additional ~3 Mt (100-200m depth extension to known deposit) 11

  12. Historic open pit Woodlawn Mine Woodlawn Mine Cross Section Cross Section • Ore lenses remain open at depth and along strike • Geological evaluation of drill hole data indicates that Conceptual deposits extend to greater drill hole to depths test ore lenses • Drilling is targeted to intersect these extensions Cross Section 19280N 12

  13. Tailings Re-treatment Project • Feasibility study examining potential to re-treat tailings remaining from previous mining released in June 2008 • Positive feasibility study North Dam results summarized and 3.1Mt updated NI 43-101 technical West Dam report completed December 4.1Mt 2009 • Pre-tax NPV (8%) is A$68 million (1) South Dam • After-tax IRR is 23% (1) 4.5Mt (1) Weighted average Bloomberg Long term Consensus Prices as published on Feb 19, 2010: Gold US$1,113/oz, Silver US$16.34oz, Zinc 13 US$2,146/tonne, Copper US$5,464/tonne and Lead US$1,711/tonne; AUD:USD Exchange Rate = 0.80

  14. Tailings Mineral Resource & Reserve Woodlawn Tailings - Resource Category Tonnes Grade Contained Metal Gold Silver Copper Lead Zinc Gold Silver Copper Lead Zinc (g/t) (g/t) (%) (%) (%) ('000 oz) ('000 oz) ('000 lb) ('000 lb) ('000 lb) ('000) Measured 5,300 0.3 31 0.50% 1.30% 2.30% 51 5,282 58,422 151,898 268,743 Indicated 4,100 0.3 34 0.50% 1.40% 2.30% 40 4,482 45,195 126,545 207,896 Measured & Indicated 9,400 0.3 32 0.50% 1.34% 2.30% 91 9,764 103,617 278,444 476,639 Inferred 2,300 0.3 31 0.40% 1.30% 2.10% 22 2,292 20,283 65,918 106,483 Total Resource converted to an Ore Reserve of 11.2 Mt grading 2.2% zinc, 1.3% lead, 0.5% copper, 0.3g/t gold and 32g/t silver 1 Note: 14 1 – JORC and CIM standard compliant – see full technical report dated December 15, 2009

  15. Re-treatment Project Economic Summary Independent 43-101 Technical Report by Scott Wilson Roscoe Postle Associates Inc. (December 15, 2009) • Estimated 7.7 year life at 1.5 Mtpa milling rate • Average annual payable production of 37 million lbs of zinc, 7 million lbs of copper, 7 million lbs of lead, 2,000 ounces of gold and 371,000 ounces of silver • Total payable production of 560,000 tonnes of zinc, copper and lead concentrates containing 125,000 tonnes of zinc, 24,000 tonnes of copper, 25,000 tonnes of lead, 18,000 ounces of gold and 2.8 million ounces of silver • Development capital ~ A$75 million • Pre-tax NPV at 8% is A$68 million at long term metal prices (1) • Internal rate of return is 23% after-tax (1) Notes: 1 – Weighted average Bloomberg Long term Consensus Prices as published on Feb 19, 2010: Gold US$1,113/oz, Silver US$16.34oz, Zinc US$2,146/tonne, Copper US$5,464/tonne and Lead US$1,711/tonne; AUD:USD Exchange Rate = 0.80 15

  16. Proposed Mining Method – Hydraulic Mining Example Of Hydraulic Mining Simple & Cost Effective Method 16

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