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Oromin Announces Robust CIL Feasibility Study Results at the OJVG Gold Project In Senegal
[February 04, 2013]

Oromin Announces Robust CIL Feasibility Study Results at the OJVG Gold Project In Senegal

(ENP Newswire Via Acquire Media NewsEdge) ENP Newswire - 04 February 2013 Release date- 01022013 - The management and technical team of Oromin Explorations Ltd., on behalf of Oromin Joint Venture Group Ltd. is extremely pleased to announce the positive results of its 2013 Carbon-in-Leach Feasibility Study and Mineral Reserve update for its OJVG Gold Project in Senegal, West Africa.

The FS was compiled by SRK Consulting (Canada) Ltd. ('SRK'). All figures are in US Dollars.

HIGHLIGHTS Net present value ('NPV') pre-tax of $740 million and after-tax of $558 million at a 5% discount rate and evaluation price of $1550 per ounce of gold, generating an after-tax internal rate of return ('IRR') of 27.7% with a 23 month payback Average annual gold production for first three years of full production at 182,000 payable ounces per year at a $489 operating cash cost per ounce Average annual life of mine ('LOM') gold production of 144,000 ounces per full milling year at an LOM operating cash cost of $654 per ounce Open pit and underground gold mining complex with a current mine life of 17 years Probable mineral reserves increase by 64% to 2.335 million ounces of contained gold since the 2010 FS - the OJVG Gold Project now hosts the largest gold reserve in Senegal Average LOM gold recovery of 90.8% Estimated start-up capital cost of $ 297.1 million, including $ 27.9 million contingency All capital and operating expenditures in the FS have been updated to Q1 2013 It is Oromin's view that with all deposits remaining open to possible expansion, along with the potential for upgrading of the Project's remaining indicated and inferred resources, future plant expansion and increased annual gold production may be realized Granting of a 15 year renewable mining licence, receipt of the Government of Senegal approved Environmental and Social Impact Assessment (ESIA) and the formation of a Senegalese operating company (Somigol) paves the way for the development of Senegal's next gold mine Optimization towards further enhancing Project economics is ongoing, including studying the mine production schedule with elevated cut-off strategies to create low-grade stockpiles as well as a plant expansion The FS does not include the results of the upcoming January 2013 Preliminary Economic Assessment ('PEA') of the Project's heap leach deposits which have potential to outline additional contained gold ounces within the Project.

Project Summary The Project will be developed by both open pit and underground mining methods, with ore trucked from four deposits to a central plant for crushing, grinding and carbon-in-leach recovery processing. Heap leach processing of a portion of the total contained ounces at the project will be addressed in an updated heap leach PEA to be announced following this release.

The mine plans envisioned within the FS are based on probable mineral reserves of 28.0 million tonnes at a grade of 2.59 g/t containing 2.335 million ounces of gold which will be mined over a 17 year mine life.

The current average annual production for the first 3 years is approximately 182,000 ounces of gold per year at an average operating cost of $489 per ounce and for the LOM, approximately 144,000 ounces of gold per year at an average operating cost of $654 per ounce. The total pre-production capital cost is estimated to be $297.1 million, including a $27.9 million contingency.

Throughput rates will vary between 4,500 and 7,500 tonnes per day based on the ratio of oxide and sulphide ore being processed. Larger daily throughput volumes, based on the increased percentage of the softer oxide ore, positively enhance the economics. The plant has been designed with sufficient flexibility for treatment of all ore types.

The financial modeling for the OJVG Gold Project indicates robust economics. At a gold price of $1,550 per ounce, the operation yields a positive after-tax NPV of $558 million at a 5% discount rate. The after-tax IRR is 27.7 % and payback is 23 months from initial gold production.

Additional Opportunities Exploration potential remains excellent, both at the known gold deposits, which all remain open to possible further expansion and throughout the entirety of the remaining Project area. This significant exploration upside could potentially support future plant expansion, increased throughput capacity, extended mine life and increased annual gold production.

At the Masato deposit the indicated resource is open to further expansion both laterally and to depth, and additional geotechnical drilling may enhance the opportunity to upgrade the status of this existing indicated resource to reserves. An additional inferred resource of 127,600 gold ounces (3.5 Mt grading 1.13 g/t Au) has also been defined at the Masato deposit which may similarly be upgraded with further drilling. Further, Masato remains open to potential expansion beyond these presently outlined resources.

Similarly, at the Golouma deposit, an inferred resource of 601,000 gold ounces (5.5 Mt grading 3.43g/t Au) has been identified. Additional closer-spaced drilling evaluation of this higher-grade mineralization may upgrade this mineralization beyond its current inferred designation. As with Masato, the Golouma deposit remains open to further potential expansion both laterally and to depth.

Note: The quantity and grade of reported Inferred resources in this estimation are uncertain in nature and there has been insufficient exploration to define these Inferred resources as an Indicated or Measured mineral resource and it is uncertain if further exploration will result in upgrading them to an Indicated or Measured mineral resource category.

Future optimization evaluations of the current heap leach-designated deposits may further enhance the potential mill feed, as many of these deposits have gold grades compatible with the CIL design. The Company will be issuing a news release updating the 2011 heap leach PEA, separately today following this release. This heap leach PEA will represent an incremental development opportunity at the Project over and above the CIL feasibility study discussed herein.

Furthermore, more than a dozen additional exploration targets and prospects have been the focus of more recent exploration activities throughout 2011 and 2012. Combining the volume expansion opportunities recognized at each of the known deposits with the exploration upside of these numerous early stage discoveries supports the potential for significant resource expansion at the Project.

Reserves and Resources SRK Mineral Reserve Estimate for the 2013 FS Update The probable mineral reserve estimate of 28.0 million tonnes at a grade of 2.59 g/t gold containing 2.335 million ounces of gold has been calculated based on a gold price of $1,250 per ounce. Mine design and cut-off grade determination were undertaken using industry standard processes and software along with estimated cost assumptions.

The production schedule forming the basis of the mineral reserves was then modelled in a discounted cash flow model, taking into account the capital costs estimates and evaluated based on the pit design price of $1,250. Based on the foregoing, the project demonstrated a post-tax NPV at 5% discount rate of $252 million, thus demonstrating the economic viability of these Mineral Reserves at the pit design price and given the contemplated cost assumptions.

The open pit external mining dilution is based on a calculation of the number of waste blocks which touch an ore block in the mineral inventory block model, along with an assumed dilution for each edge of a block.

A portion (waste material only) of the pit design that constrains the Masato reserve infringes on the adjacent property concession of Teranga.

The actual mineralized zone is not affected but if the entire reserve is mined, the upper benches of an open pit would cross the adjacent property boundary and an agreement with the holder of that property would have to be reached before this mining could occur. No OJVG resources extend onto the Teranga concession. OJVG has an agreement in principle with Teranga allowing OJVG to mine waste on the Teranga concession in order to extract Masato ore contained on the OJVG concession.

The mineral reserve estimate for the OJVG Gold Project open pits was defined by applying economic factors for gold price, mining dilution, process recovery, operating costs, refining/transport costs and royalties to the mineral resource estimate. The mining, processing and general administration costs are based on feasibility level engineering for the expected mill throughput rate.

A distinction has been made between material types (soft vs. hard) for both ore and waste in order to capture the expected variation in mining and processing costs and mill production rates. The mineral inventory block models for each of the deposits were evaluated with the Gemcom Whittle - Strategic Mine Planning ('Whittle') software to determine optimal mining shells to be used for mine design.

SRK Mineral Resource Estimate for the 2013 FS Update The total indicated resource for all deposits at the OJVG Gold Project is 75.21 million tonnes grading 1.56 g/t Au containing 3.78 million ounces of gold. The total inferred resource for all deposits at the Project is 17.33 million tonnes grading 1.73 g/t Au, containing 0.96 million ounces of gold.

Mining and Production Mining of the Masato deposit will take place using open pit mining methods. The Golouma deposit will be mined by a combination of open pit and underground methods. The Golouma open pit will form access for the development of the Golouma underground mines. The four Golouma underground mines (Golouma South 1 and Golouma West 1, 2 & 3) will be mined in a sequence that targets the higher grade deposits as early as feasible in the mining schedule.

Two additional high-grade underground mines at the Kerekounda and Kourouloulou deposits are also planned. Kerekounda will be accessed via a small open pit mine aimed at exposing fresh rock for underground development. The Kourouloulou mine will be accessed via a small box-cut and decline.

All mines will share a common processing facility. Throughput is planned at a yearly production rate of approximately 1.7 million tonnes for sulphide ore and 2.7 million tonnes for oxide ore.

The OJVG Gold Project open pit and underground mines will produce a total of 28 million tonnes (Mt) of ore and 184 Mt of waste rock over a 17 year mine operating period. The mine schedule focuses on achieving the required plant feed production rate and is based on mining of higher grade material early in the schedule while balancing stripping ratios. The mining schedule maximizes the attainable mill throughputs based on the oxide/sulphide ore ratios produced.

The OJVG Gold Project is most profitable when the open pit phases and the underground workings are mined concurrently. This approach allows the higher underground ore grades to be milled initially yet allows the open pits to provide the additional ore feed to maintain the mill at maximum capacity.

Average annual gold production for the 13 years of full production from 2017 to 2029 inclusive, is expected to be approximately 144,000 ounces per year.

Processing The process plant and associated service facilities for the OJVG Gold Project are designed to process run of mine ('ROM') ore delivered to the primary crusher, and ultimately to produce dore bars. The milling process encompasses crushing and grinding of the ore, carbon-in-leach cyanidation and adsorption, carbon stripping, electro-winning and smelting to produce gold bars that are then shipped to a refinery for final processing.

The key design criteria used in the FS for the plant design are listed below: Treatment of an average 4,540 dry metric tonnes per day ('t/d') for 365 days per year, after allowance for availability whilst treating 100% primary sulphide ore; Treatment of an average 7,390 t/d for 365 days per year, after allowance for availability whilst treating oxide ore, or a blend of oxide and sulphide ore containing no more than 43% sulphide ore; Sufficient plant design flexibility for treatment of all ore types from all deposits as per test work completed at design throughput.

The soft ore treatment rate is higher than the primary hard ore treatment rate due to the ore being significantly less competent and therefore requiring less power in the grinding circuit. Overall gold extractions seen in the various metallurgical test work programs ranged from 88 - 95 % depending on the ore lithology.

Operating Cost Estimates (As at Q1 2013) The estimated operating costs for the OJVG Gold Project are $654 per ounce of payable metal.

Capital Cost Estimates (As at Q1 2013) Pre-production development capital for project facilities is estimated to be approximately $297.1 million, which includes open pit mobile equipment costs, underground mine development for the Kerekounda and Kourloulou deposits, plant and infrastructure construction and commissioning costs, as well as site infrastructure construction costs plus contingency.

Ongoing life-of-mine sustaining capital is $208.0 million, including underground mobile equipment replacements, waste facility expansions, sustaining capital estimates for fixed plant and infrastructure and ongoing underground development.

The sustaining capital also covers the preproduction capital for later Golouma underground mines that commence development once the Golouma open pit mine has provided access.

A contingency has been added to the underlying capital cost estimates that reflects the level of risk associated with those estimates. The overall weighted-average contingency for the entire capital program is 11%.

Economic Analysis The mining and processing plan was evaluated at three different gold prices: $1,350/oz, $1,550/oz and $1,750/oz. Economic evaluation was undertaken using industry-standard discounted cashflow modelling. Common assumptions used in the cash flow models include: 5% discount rate for NPV calculation; In accordance with government policy, a tax-free period was applied until 2018. From 2018 onwards, each of a 15% import duty applicable to 50% of operating costs (estimate of imported component), a 30% corporate income tax, and a 18% Value Added Tax were applied. The corporate income tax recently increased to 30% from 25% effective January 2013; A combination of unit-of-production depletion and 15% straight-line depreciation was assumed for deductions used in estimation of corporate income tax. Depletion and depreciation were accumulated and carried forward until they could be utilized for tax purposes; 3% government royalty is applied to payable gold revenue; 100% payable gold has been assumed with a $7.00/oz off-site refining cost; All 2012 and prior costs assumed to be sunk costs with economic analysis beginning in 2013; Plant commissioning takes place in the 3rd quarter of 2015 and commercial plant production begins in H2 2016.

The results of the analyses indicate that the project demonstrates robust economics under all three gold price scenarios. The overall project break-even gold price is $1,019 /oz using a 5% discount rate.

Note that the cash-flow analysis at the various prices uses the base mining and processing plan without modifications. Further value may be generated by optimizing mining and processing strategies at the evaluation prices.

Additional Value-Adding Opportunities The mine plans were developed on the basis of a fixed gold price and therefore a fixed cut-off grade strategy. During operations of a long life and flexible mining complex such as is proposed, there may be opportunities to improve project economics by making management decisions that are responsive to variations in economic parameters. These management options include the ability to vary cut-off grade to maximize cashflow and value.

The use of intermediate-grade stockpiling is known to improve project economics in many cases. Oromin has undertaken to examine the upside potential of this type of optimization.

To find out more about Oromin Explorations Ltd., visit Contact: Oromin Explorations Ltd.

2000 - 1055 W. Hastings Street Vancouver, BC Canada V6E 2E9 Tel: 604-331-8772 Toll Free: 1-877-529-8475 Fax: 604-331-8773 Cautionary Statements This press release contains certain forward-looking information as defined in applicable securities laws (referred to herein as 'forward-looking statements'). Specifically, this press release has as its principal subject a feasibility study update as at today's date prepared by our independent consultants.

In addition, this release provides certain comparisons to a prior feasibility study as at July 2010, as filed on SEDAR July 15, 2010 (the '2010 Feasibility Study').It is emphasized to readers that any feasibility study is based upon assumptions about such factors as extent and continuity of mineralization, rock density, and variation between predicted and actual deposit shapes.

In addition any feasibility study is based upon assumptions about such factors as availability of capital for development, commencement of construction, capital costs, ore grade, anticipated gold production, gold recovery, cash operating costs and other costs, expected mine life, projected internal rate of return, projected payback period, sensitivity to metal prices and other sensitivities, and assumptions underlying any financial analysis. Statements based on such assumptions may be viewed as forward-looking statements.

Any company contemplating the development of a mineral resource is subject to such risks and uncertainties as commodity price volatility, changes in debt and equity markets, the uncertainties involved in interpreting geological data, increases in costs, environmental compliance and changes in environmental legislation and regulation, interest rate and exchange rate fluctuations, market competition, ongoing relations with employees and impacted communities, general economic conditions and other risks involved in the mineral exploration and development industry, as well as those risk factors discussed in the section entitled 'Description of Business - Risk Factors' in Oromin's Annual Information Form filed on SEDAR May 29, 2012.

Statements based on such assumptions may be viewed as forward-looking statements.

The operating and capital costs in the 2013 Feasibility Study which is the principal subject of this news release were developed to be reasonable estimates within industry benchmarks. The 2013 Feasibility Study uses estimates of gold prices in line with norms currently used in our industry. There is no certainty that the results of the 2013 Feasibility Study will ever be realized.

Should one or more of the risks or uncertainties involved in forward-looking statements relating to the 2013 Feasibility Study materialize, or should the assumptions underlying the 2013 Feasibility Study prove incorrect, actual results of the 2013 Feasibility Study may vary materially from those anticipated, believed, estimated or expected. Statements based on such assumptions may be viewed as forward-looking statements.

Forward-looking statements involve known and unknown risks, uncertainties and other factors which are beyond Oromin's ability to predict or control and may cause Oromin's actual results, performance or achievements to be materially different from any of its future results, performance or achievements expressed or implied by forward-looking statements. Accordingly, readers should not place undue reliance on forward-looking statements.

Oromin undertakes no obligation to update publicly or otherwise revise any forward-looking statements contained herein whether as a result of new information or future events or otherwise, except as may be required by law.

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