Castle Resources Inc.

February 28, 2013 16:50 ET

Castle Resources Announces Positive Preliminary Economic Assessment for the Granduc Copper Project

- Pre-tax net present value (NPV 8%) of $388 million and a 20.9% internal rate of return (IRR); post-tax NPV 8% of $253 million and a 17.8% IRR

TORONTO, ONTARIO--(Marketwire - Feb. 28, 2013) - Castle Resources Inc. (TSX VENTURE:CRI) ("Castle" or the "Company") is very pleased to provide investors the results from the its preliminary economic assessment ("PEA") completed for its 100% owned Granduc Copper Project located near Stewart, British Columbia and prepared in accordance with National Instrument 43-101. The PEA confirms that current resources achieve a pre-tax net discounted value ("NDV 8%") of $489 million and a pre-tax net present value ("NPV 8%) of $388 million, a 4 year payback period and annual production averaging 70 million pounds of payable copper equivalent over a 15 year mine life. (All figures in US dollars except where noted). Castle Resources commissioned Tetra Tech, an independent third party, to prepare the PEA.

PEA Highlights:

  • Base Case (defined below) initial estimated CAPEX of $494 million including a 16.3% contingency of $69 million with estimated sustaining capital of $239 million over a 15 year mine life

  • Base Case pre-tax NDV 8% from a discounting start date of Q1 2016 is $489 million with a pre-tax IRR of 20.9%; post-tax NDV 8% of $319 million with a post-tax IRR of 17.8%. Changing the discounting start date to Q1 2013 results in a NPV 8% of $388 million pre-tax and $253 million post-tax, but does not impact the IRR.

  • Life of Mine average operating cash flow is $142 million per year; Peak Life of Mine (Years 2-8 inclusive) is $164 million per year

  • The project evaluation assumes flat long term metal prices equal to the rolling three year average of $3.65/lb Cu, $28/oz Ag and $1480/oz Au. The benchmark magnetite prices used is $122/tonne. The assumed exchange rate is C$1.00 = US$0.99.

  • The resource used is 11.32 million tonnes in the measured & indicated category grading 1.47% Cu, 0.17 g/t Au and 12.4 g/t Ag and 44.63 million tonnes in the inferred category grading 1.43% Cu, 0.19 g/t Au & 10.7 g/t Ag

  • Peak Life of Mine (Years 2 - 8 inclusive) annual payable production is forecasted at 72 million lbs of copper, 811 koz silver, 9.5 koz gold and 251,000 tonnes of magnetite

  • 8,500 tonnes/day underground mining operation

  • Base Case gross cash operating costs of $2.04/lb payable Cu and net cash costs (inclusive of by- product credits) of $1.37/lb payable Cu.

Cautionary Statement: Mineral resources that are not mineral reserves do not have demonstrated economic viability. This preliminary economic assessment is preliminary in nature; it includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves, and there is no certainty that the results of the preliminary economic assessment will be realized.

"The results of our PEA clearly demonstrate the strong economics of the Granduc Copper Project," stated Mr. Mike Sylvestre, President & CEO of Castle Resources. "Given the excellent potential to continue to expand the Granduc resource, the project economics should continue to improve as we lengthen the life of mine and continue the process of optimization."

Mr. Sylvestre continued: "The PEA represents a significant milestone in the development of the Granduc on our road towards a completed feasibility study. With the completion of the PEA we now have robust economics to add to the Granduc story, along with a continually expanding high-grade copper resource and excellent infrastructure already in place, notably the Granduc Road and 17 km haulage tunnel. We are particularly pleased with the CAPEX estimate, a figure that in a climate of rising costs for large mining projects is very reasonable and will be attractive to potential off-take and joint venture partners as we advance the project towards feasibility."

The PEA envisions an underground mining operation similar in scope to the historic mining operations from the 1970s and 80s. The PEA assumes that the mine will use the low cost, high productivity sub-level caving method for approximately 80% of ore mined. The remaining 20% of ore will be mined using the blast hole stoping method which will consume the bulk of waste rock from development for backfill. Under the PEA, the ore will be transported by rail through the 17 km Tide haulage tunnel to the concentrator. The concentrator would operate at a steady-state rate of 8,500 tonnes/day, beginning with all of the crushed ore being ground in a SAG mill to 160 microns, then only the rougher concentrate representing 15% of the total ore will be reground to a size of approx. 25 microns. Rougher tailings will be subjected to magnetic separation to recover approx. 61% of the feed magnetite.

Based on test work completed on behalf of Castle and historical performance, the concentrator is expected to achieve a recovery of approximately 95% and will produce a clean 27% copper concentrate. It is anticipated that concentrate will be trucked 52 km by road to a marine load-out facility near Stewart, where it will be shipped in vessels with 50 kt capacity to end users located primarily in Asia.

The Base Case project includes production of a copper concentrate, that also contains payable silver and gold, as well as a magnetite concentrate that would be sold as feed to the steel industry. In addition, Castle commissioned an independent study to analyze the impact of selling some magnetite as heavy media to regional coal producers (this study will be included in the full PEA when published on SEDAR). In the Alternative Case, the economics in the PEA examine the impact the Granduc Copper Project without magnetite production.

Project Economics:

Base Case: A copper concentrate (with Ag/Au credits) and a magnetite concentrate will be produced

Alternative Case: A copper concentrate (with Ag/Au credits) will be produced (no magnetite)

Initial CAPEX for the Base Case is estimated at $494 million including a 16.3% contingency of $69 million. Sustaining capital is estimated at $239 million, or approximately $15 million per year over the 15 year life of project. For the Alternative Case, Initial CAPEX is lower at $485 million while sustaining capital is unchanged.

Base Case CAPEX & OPEX (US dollars)

Item Initial CAPEX
Mining $ 167 million
Processing $ 67 million
Tailings Storage Facility $ 28 million
Infrastructure $ 70 million
Total Directs $ 332 million
Indirects & Owners $ 93 million
Contingency $ 69 million
Total $ 494 million
Item Sustaining CAPEX
Mining $ 178 million
Tailings Storage Facility $ 33 million
Contingency $ 28 million
Total $ 239 million
Mining $ 23.52/tonne
Processing & Tailings $ 9.31/tonne
G&A $ 6.55/tonne

Magnetite Resource:

As an addition to the previously reported Cu, Au, and Ag resource estimation, Tetra Tech has been retained to estimate the magnetite content of the Granduc deposit. The Qualified Person for this resource estimation is Robert Morrison, Ph.D., MAusIMM (CP), P.Geo., Lead Resource Geologist for Tetra Tech. The current Granduc inferred magnetite resource is 37.1 million tonnes grading 13.3% magnetite, assuming a 2.8% magnetite cut-off, applied only to blocks above the 0.8% CuEq (Cu-Au-Ag Cu-equivalent) cut-off. This estimation utilizes existing Fe assays, a strong Fe-magnetite correlation, and incorporates new magnetite assays. The magnetite grades were estimated into the existing high-grade Cu domains of the deposit, where data density allowed, using a combination of Conditional Simulation and Collocated Cokriging. At a 0.8% CuEq cut-off, magnetite was estimated into 11.04 Mt of the initial Measured and Indicated Resource, and 28.04 Mt of the initial Inferred Resource. The remainder of the blocks (including all 14.11 Mt of the North Zone above 0.8% CuEq cut-off, as well as 0.28 Mt Measured & Indicated and 2.48 Mt Inferred in the Main Zone above 0.8% CuEq cut-off), representing approximately 30% of the total resource, did not have magnetite estimated. This is not to indicate that these blocks do not contain any magnetite, only that there is insufficient data to facilitate such an estimate at this time.

The following Qualified Persons have reviewed and approved the technical disclosure contained in this press release:

  • Robert Morrison, Ph.D., MAusIMM (CP), P.Geo., Lead Resource Geologist for Tetra Tech, regarding the resource estimate
  • Garth Liukko, P.Eng., Mine Engineer for Tetra Tech, regarding mining methods and mining capital and operating costs
  • Cam McKinnon, P.Eng., Process Manager for Tetra Tech, regarding mineral processing and metallurgical testing, recovery methods and process capital and operating costs
  • Dharshan Kesavanathan, P.Eng., Manager of Private Sector Water for Tetra Tech, regarding surface infrastructure design and the associated capital and operating cost estimates
  • Sabry Abdel Hafez, Ph.D., P.Eng., Mine Engineer for Tetra Tech, regarding the economic analysis
  • Andre C. Gagnon, P.Eng., Geotechnical Engineer for Tetra Tech, regarding tailings storage facility design and the associated capital and operating costs
  • Brad Leonard, P. Geo., Castle's Exploration Manager has reviewed and approved the contents of this news release on behalf of the Company

About Castle Resources

Castle is a Toronto-based junior mineral development company focused on the exploration and redevelopment of the 100% owned past producing Granduc Copper Mine. Castle currently has 173 million shares outstanding shares. For more information please visit the Castle Resources' website at


This press release contains forward-looking information within the meaning of Canadian securities laws. forward-looking information includes, but is not limited to, statements with respect to the Granduc project; Castle's ability to raise additional funds necessary; the future price of copper; gold, silver and magnetite, the estimation of mineral reserves and mineral resources; conclusions of economic evaluation; the realization of mineral reserve estimates; the timing and amount of estimated future production, development and exploration; costs of future activities; capital and operating expenditures; success of exploration activities; mining or processing issues; currency exchange rates; government regulation of mining operations; and environmental risks. Generally, forward-looking statements can be identified by the use of forward-looking terminology such as "plans", "expects" or "does not expect", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates" or "does not anticipate", or "believes", or variations of such words and phrases or statements that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved". Forward-looking statements are based on the opinions and estimates of management as of the date such statements are made. Forward-looking statements are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of Castle to be materially different from those expressed or implied by such forward-looking statements, including but not limited to those risks described in Castle's public disclosure documents filed on SEDAR from time to time. Although management of Castle has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. Castle does not undertake to update any forward-looking statements, except in accordance with applicable securities laws.

This news release does not constitute an offer to sell or solicitation of an offer to sell any of the securities in the United States. The securities have not been and will not be registered under the United States Securities Act of 1933, as amended (the "U.S. Securities Act") or any state securities laws and may not be offered or sold within the United States or to a U.S. Person unless registered under the U.S. Securities Act and applicable state securities laws or an exemption from such registration is available.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

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