Columbus Gold Announces Positive Bankable Feasibility Study for Montagne d'Or Gold Project, French Guiana
VANCOUVER, BRITISH COLUMBIA--(Marketwired - March 20, 2017) - Columbus Gold Corp. (TSX:CGT)(OTCQX:CBGDF) ("Columbus") is pleased to announce the results of the independent Bankable Feasibility Study prepared in accordance with National Instrument 43-101 ("NI 43-101") for its Montagne d'Or Gold Project ("Montagne d'Or" or "Project") located in French Guiana. The NI 43-101 Technical Report will be filed on SEDAR within 45 days of the date of this news release. The Bankable Feasibility Study was finalized on-time under an accelerated three-year timeline which required among other things, substantial drilling, completion of three resource estimates, a preliminary economic assessment (PEA), numerous associated technical reports, community consultations, and comprehensive environmental studies.
Columbus has retained a third-party consultant to review the Bankable Feasibility Study and underlying resource and reserve models.
Robert Giustra, CEO of Columbus, commented: "The completion of the Bankable Feasibility Study is a major milestone in the advancement of what is clearly a significant gold deposit with substantial potential. With the base-case and fundamental underlying economics now well understood, that potential is being immediately pursued with further exploration drilling, which is already underway on strike east and west, with one hole completed at depth beneath the pit. In addition, a near-term program is being considered to infill drill the higher-grade portion of nearly 1 million resource pit constrained, Inferred ounces."
Mr. Giustra further stated: "In parallel with additional drilling, Columbus is evaluating a number of indications of interest it has received to fund mine construction, the next logical step for the development of the Montagne d'Or deposit."
Bankable Feasibility Study Highlights
- Net Present Value ("NPV") of US$370 million (~C$500 million at 1.35 USDCAD exchange rate) after tax (at a 5% discount rate);
- Internal Rate of Return ("IRR") of 18.7% after tax, at an assumed gold price of US$1,250 per ounce ("oz");
- Reserves calculated at a gold price of US$1,200/oz;
- Proven & Probable Mineral Reserves of 2,745,000 oz gold ("Au") (54.1 million tonnes ("Mt") at 1.58 grams per tonne ("g/t") Au), a subset of the Measured and Indicated Resources of 3,850,000 oz Au (85.1 Mt at 1.41 g/t Au, using a cut-off grade ("CoG") of 0.4 g/t and a US$1,300/oz Au price);
- Life-of-mine ("LOM") production of approximately 2,572,000 oz Au; 214,000 oz per year, over a 12-year mine life, using an average overall gold recovery of 93.8% that results in an average LOM Total Cash Cost of US$666/oz and LOM All-In Sustaining Costs ("AISC") of US$779/oz;
- Average annual gold production of 237,000 oz over the first ten years of mine life at an average grade of 1.73 g/t Au that results in an average AISC of US$749/oz;
- Total Net Initial Capital Costs (including pre-stripping and contingency, less surplus tax credit refunds) of US$361 million (table below for Capital Costs breakdown), with an After-tax Payback Period of 4.1 years, and LOM Sustaining Capital Costs of US$231 million. LOM contingency rate of 9.5% is included in the estimate; and
- Estimated employment during the peak of construction of 900 jobs, and the creation of 658 permanent direct jobs, not counting service providers' personnel working exclusively for the Project, and up to an estimated 3,000 indirect jobs during operation. Most of the mine personnel will be employed from within French Guiana.
Project Enhancement Opportunities
Following an evaluation of the Bankable Feasibility Study, Columbus believes the following improvements to the Project can be made:
- Certain Capital Costs can be optimized, subject to sourcing improved budget quotations from suppliers.
- SRK has identified Inferred Resources located within the resource pit of 960,000 oz Au (20.2 Mt at 1.484 g/t Au, using a CoG of 0.4 g/t Au and a US$1,300/oz Au price). Infill drilling has the potential to convert some of these Inferred ounces to higher resource classification. Columbus and Nordgold are considering undertaking 4,300 meters (m) of infill drilling, at an estimated cost of US$1.5 million. The drilling is being assessed for commencement in Q2 2017 subject to obtaining the required drilling permits.
- There is a potential to lower the CoG used for reserves if gold prices increase, and with optimization of operating costs used in the CoG calculations. This has the potential to convert some additional Measured and Indicated Resources within the current designed pit into Proven and Probable Reserves.
- Columbus is looking into opportunities to refine the pit designs which could have the potential to increase reserves.
- On February 13, 2017, Columbus announced commencement of an exploration drilling program at Montagne d'Or. The program consists of 36 core holes, for a total of 5,520 m, designed as a first
pass investigation of exploration targets on strike of, and in very close proximity of the currently defined reserves. Four targets will be tested: 1) four widely-spaced drill hole fences will test
the west strike extent of the deposit up 1.25 kilometers west of the current resource; 2) the Gustave geochemical anomaly located 500 m east of the Montagne d'Or deposit where a historical drill
hole intersected 3.5 m of 31.94 g/t; 3) potential mesothermal quartz-gold vein systems within 1,000 m north of the deposit; and, 4) one hole under the deposit to test the down-dip extent of the
principal mineralized zones. See link for news release of February 13, 2017:
Bankable Feasibility Study Metrics
|Mine and Operating Metrics|
|Reserves (calculated at US$1,200 Au) (oz)||2,745,000|
|LOM Payable Gold (oz)||2,572,000|
|Average Annual Production, LOM (oz)||214,000|
|Average Annual Production, Years 1-10 (oz)||237,000|
|Average Grade, LOM (g/t)||1.58|
|Average Grade, Years 1-10 (g/t)||1.73|
|Mining Cost (US$/t mined)||$2.44|
|Mining Cost (US$/t processed)||$13.01|
|Processing Cost (US$/t)||$11.49|
|Site G&A/Other (US$/t processed)||$4.27|
|All-in Sustaining Costs ("AISC")||US$000's||US$/oz|
|Direct Cash Costs||$1,558,922||$606|
|Indirect Cash Costs||$153,374||$60|
|Total Cash Costs||$1,712,296||$666|
|Sustaining Capital Costs||231,120||90|
|AISC - LOM (includes closure/reclamation)*||$2,004,076||$779|
|AISC - Years 1-10||$1,775,285||$749|
|* LOM AISC excluding closure/reclamation - US$756/oz.|
|Mine Construction Capital Costs||443,000|
|Total Initial Capital Costs Before Surplus Tax Credit Refunds||535,000|
|Less: Initial Capital Costs Surplus Tax Credit Refunds||(174,000)|
|Total Net Initial Capital Costs After Surplus Tax Credit Refunds||$361,000|
|Total LOM Capital||$653,000|
|Economics (based on US$1,250 Au)||US$000's|
|After-tax NPV at 5%||370,000|
|Pre-tax NPV at 5%||507,000|
|After-tax Payback Period From Start of Production (years)||4.1|
|After-tax Free Cash Flow||660,000|
|Note: EURUSD Exchange Rate is US$1.05:EUR1.00.|
The Bankable Feasibility Study was funded by Nord Gold SE ("Nordgold") pursuant to which it has earned a 50.01% interest in the Project. Nordgold was required to spend a minimum of US$30 million and complete a Bankable Feasibility Study by March 13, 2017. Nordgold has met the minimum spending requirement and delivered the Bankable Feasibility Study to Columbus by the March 13, 2017 deadline. Nordgold acquired an additional 5% interest in the Project (for a total interest of 55.01%) pursuant to a share purchase agreement dated January 12, 2016. Nordgold has delivered a notice of option exercise to Columbus to acquire its total 55.01% interest in the Project.
Mineral Resource Estimate
The Mineral Resource Estimate is supported by 349 diamond core and reverse circulation drillholes. The drilling was completed in two main campaigns. A previous property owner drilled 56 holes between 1996 and 1998. Columbus completed an additional 293 holes from 2011 to March, 2016. The Columbus drilling was accompanied by an industry standard Quality Assurance/Quality Control program providing good confidence in the sampling, sample preparation and analytical results.
The Mineral Resource is confined mainly within a grade shell which encloses anomalous gold mineralization at a 0.3 g/t Au threshold. The grade estimation was conducted in eight domains. Four rock groups were used and each rock group was estimated independently both internal and external to the grade shell using only samples from the same domain. An Inverse Distance Weighting Squared algorithm was used for the grade estimations. Industry standard validation methods were used to evaluate the results. The Mineral Resources are classified according to CIM Guidelines into Measured, Indicated and Inferred categories based mainly on average drillhole spacing.
The Montagne d'Or Mineral Resource Statement is presented in the table below. The resource is confined within a Whittle™ optimization pit shell and a CoG of 0.4 g/t Au is applied. The pit shell and CoG assumes open-pit mining methods and is based on a mining cost of US$2/t mined, milling cost of US$15/t ore, administration cost of US$1/t ore, a gold price of US$1,300/oz, 95% gold recovery, gold refining cost of US$8/oz, and 5% net smelter return (NSR) royalty. A 45° pit shell slope was used for bedrock and a 35° pit shell slope was used for saprolite. The reported Mineral Resources include material from all estimation domains.
Montagne d'Or Mineral Resource Statement as of July 1, 2016
|M & I||0.4||85.1||1.405||3.85|
- The Montagne d'Or Mineral Resource Statement was prepared by SRK Consulting (U.S.), Inc. in accordance with NI 43-101, with an effective date of July 1, 2016.
- Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. The estimate of Mineral Resources may be materially affected by environmental, permitting, legal or other relevant issues. The Mineral Resources have been classified according to the CIM Definition Standards for Mineral Resources and Mineral Reserves in effect as of the date of this news release.
- All figures were rounded to reflect the relative accuracy of the estimates.
- Metal assays were capped where appropriate.
- Mineral Resources are reported based on a CoG of 0.4 g/t Au, and are reported inside a conceptual pit shell based on appropriate mining and processing costs and metal recoveries for oxide and sulphide material.
- CoGs are based on a mining cost of US$2/t, milling cost of US$15/t, administration cost of US$1/t, a gold price of US$1,300/oz, 95% gold recovery, gold refining cost of US$8/oz, and 5% NSR royalty.
- In accordance with NI 43-101, the Technical Report to be filed on SEDAR will only incorporate Measured and Indicated Resources in its calculations, and will exclude Inferred Resources.
- Moz = million ounces.
Mineral Resource Sensitivity
The Mineral Resources are presented at a range of CoGs, subdivided by resource classification. All resources are confined within the Whittle™ optimization pit shell.
Mineral Resource Sensitivity (1)
|Measured and Indicated|
|(1) Tonnes and grade have been rounded to reflect the level of expected accuracy.|
|(2) Base resource case CoG.|
Mineral Reserve Estimate
Mineral Reserves were determined based on a gold price of US$1,200/oz Au. Reserves stated are as of September 1, 2016. The ore material is converted from Mineral Resources to Mineral Reserves based on positive Project cash flow results, pit design and geological classification of Measured and Indicated Resources.
Montagne D'Or Mineral Reserve Estimate as of September 1, 2016
|Proven and Probable||54.11||1.58||2.75|
- The ore reserves were estimated by Bret C Swanson, BE (Min) MMSAQP #04418QP, a Qualified Person.
- Mineral Reserves have an effective date of September 1, 2016. All Mineral Reserves in this table are Proven and Probable Mineral Reserves. The Mineral Reserves are not in addition to the Mineral Resources, but are a subset thereof.
- Mineral Reserves are reported at varied cut-offs dependent on lithological rock types, economics and estimated metallurgical recovery. Felsic Tuffs have CoG of 0.617 g/t Au, Granodiorites have a CoG of 0.622 g/t Au, Mafics have a CoG of 0.665 g/t Au, Saprolite and Saprock have a CoG of 0.552 g/t Au.
- Associated metallurgical recoveries have been estimated as 93.8% for Felsic Tuffs, 95.2% for Granodiorites, 91.3% for Mafics and 96.4% Saprolite/Saprock.
- Full mining recovery assumed.
- Reserves have no additional dilution added to that that inherent in the selective mining unit of 5 m x 5 m x 5 m diluted mine block model.
- Reserves are based on a US$1,200/oz Au price and an exchange rate of US$1.10:EUR1.00.
- Reserves are converted from resources through the process of pit optimization, pit design, production schedule and supported by a positive cash flow model.
- Rounding as required by reporting guidelines may result in summation differences.
Mining and Processing
The Montagne d'Or mine will be an open pit mine operation. The conversion of Mineral Resources to Mineral Reserves resulted in a diluted Mineral Reserve Estimate of 54.1 Mt at a grade of 1.58 g/t Au, resulting in a contained total of 2.75 Moz Au in situ prior to metallurgical recovery.
The ultimate open pit design has been separated into eight mine design phases for sequenced extraction for the mining production schedule, and has a stripping ratio of 4.5 to 1 (waste to ore tonnage). The mine production schedule is based on feeding the ore processing facility operating at a rate of 4.5 Mt per year, however, ore is mined in excess this rate so that marginal low-grade can be stockpiled (and processed at the end of the mine life). The mining plan consists of two years of limited pre-stripping (prior to ore processing start-up), ten years of open pit mining, and two years of low-grade ore stockpile re-handling to feed the mill.
Two waste rock dumps, the West Dump and Central Dump, are located north of the open for placement of waste material. These are near the open pit to reduce the waste haulage cycle times for trucks.
Because of the significant rainfall, terrain and saprolite, a mixed mining equipment fleet mining was planned. The initial fleet was planned to consist of two (6.7 m3 capacity) excavators loading a fleet of nine (40 t) articulated dump trucks ("ADTs"). The ADTs will be used for pioneering excavation and most of the saprolite mining. As the open pit expands a larger mining fleet will be introduced consisting of three (12.0 m3 capacity) excavators and 17 (91 t) rear dump trucks to perform most of the bulk mining production.
The process plant design criteria were derived from the metallurgical test work results. The Project adopted a robust metallurgical flowsheet designed for optimum recovery with minimum operating costs, and utilizes unit operations that are well proven in the industry. The plant layout provides ease of access to all equipment for operating and maintenance requirements whilst maintaining a compact footprint to minimize environmental impact.
The key specific criteria for the plant design were:
- 4.5 Mt per year (12,330 t per day) throughput based on the design ore blend;
- Mill utilization of 91.3% ; and
- Sufficient instrumentation and automation to enable stable process operations and to facilitate safe operation.
The Montagne d'Or plant has been designed to treat the range of ore types and blends that will be mined over the life of the Project. The treatment plant design incorporates the following unit process operations:
- Primary jaw crushing;
- A crushed ore surge bin with a dead stockpile;
- A single stage semi-autogenous grinding circuit with recycle crushing circuit to produce an 80% passing 75 micron grind size;
- Gravity concentration and removal of coarse gold from the milling circuit recirculating load;
- Pre-leach thickening;
- Leach/carbon-in-leach circuit incorporating a leach tank and six carbon-in-leach tanks with carbon for gold adsorption;
- An elution circuit treating loaded carbon, electrowinning and gold smelting to produce doré;
- Tails wash thickener;
- A sulphur dioxide/air cyanide destruction circuit to reduce the tailings weak-acid dissociable cyanide concentration to below 10 parts per million; and
- Tailings pumping to the tailings storage facility.
The Project is approximately 120 km by road from the nearest major settlement, Saint-Laurent-du-Maroni, which has good transport links, communications services and with connection to the regional power grid. A 106 km, 90 kilovolts overhead powerline is planned to connect the site to the existing power grid.
Gold price sensitivity shows that the after-tax Project NPV 5% changes approximately US$1.24 million for every US$1 change in gold price, either upwards or downwards.
Sensitivity Analysis at Various Gold Price Points
|1,250 (Base Case)||370||18.7|
Discount rate sensitivity is important due to the remote location of the Project, in a jurisdiction that has little organized mining activity. Discount rate sensitivity shows that the after-tax Project NPV is positive as currently designed, up to an 18.5% discount rate.
Sensitivity Analysis at Various Discount Rates
|5% (Base Case)||370|
The Project is also sensitive to the EURUSD exchange rate as operating costs are approximately 77% Euro-based while Capital Costs are approximately 66% Euro-based. The remaining costs are mainly USD-based. EURUSD exchange rate sensitivity shows that the after-tax Project NPV 5% changes approximately US$12 to 13 million for every 100 basis point change in the exchange rate, either upwards or downwards.
Sensitivity Analysis at Various EURUSD Rates
|1.05 (Base Case)||370||18.7|
Operating Costs and Capital Costs
Based on an exchange rate of US$1.05:EUR1.00, the Project has total operating costs of US$28.76/t processed and LOM Capital Costs of US$827 million including final closure and reclamation. An overall contingency rate of approximately 9.5% has been applied to capital items. Some of the major assumptions underlying the cost estimates are:
- Diesel Fuel: EUR1.24/litre (preproduction phase), EUR1.14/litre (production phase).
- Grid Power: EUR0.113/kilowatt-hour (production phase).
Operating Cost Summary
|Operating Costs in 000's||US$ @ 1.05|
|Total Operating Costs||$1,556,547|
|Operating Cost Unit Rates||US$/t Proc.|
|Mining ($/t mined)||2.44|
|Mining ($/t processed)||13.01|
|Total Operating Costs||$28.76|
Life-of-Mine Capital Costs (US$000's)
|Description||US$ @ 1.05|
|Initial Capital Costs|
|Total Initial Capital||$535,191|
|Sustaining Capital Costs|
|Total Sustaining Capital||$231,120|
|Total Capital Costs|
|Subtotal Capital Costs||$766,312|
|Total LOM Capital Costs||$826,971|
The technical report, entitled "NI 43-101 Technical Report, Bankable Feasibility Study, Montagne d'Or Project, French Guiana, Effective Date: March 6, 2017," will be filed on SEDAR within 45 days of the date of this news release. The scientific and technical data contained in this news release pertaining to the Project has been reviewed and approved by the following Qualified Persons under NI 43-101 who consent to the inclusion of their names in this press release: Peter Clarke, BSc Mining, MBA, Peng, APEGBC#13473, SRK Consulting (U.S.), Inc. and David Gordon, BAppSc Engineering Metallurgy, FAusIMM, Lycopodium Minerals Pty Ltd, both of whom are independent of Columbus.
In this news release, the Qualified Person for the Mineral Resource Estimate is Bart A. Stryhas, PhD, CPG, AIPG#1034 of SRK Consulting (U.S.), Inc., and the Qualified Person for the Mineral Reserve Estimate is Bret C. Swanson, BEng Mining, MAusIMM, MMSAQP #01418QP.
Rock Lefrançois, Chief Operating Officer for Columbus and Qualified Person under National Instrument 43-101, has reviewed this news release and is responsible for the information reported herein related to the exploration drilling program currently underway at Montagne d'Or.
ON BEHALF OF THE BOARD,
Robert F. Giustra
Chairman & CEO
This news release includes certain forward‐looking statements concerning future performance and operations of Columbus and its subsidiaries and its mineral project, including the expected price of metals, the estimation of Mineral Resources and Mineral Reserves including potential increases in estimates and conversion of Inferred Mineral Resources, potential lowering of the CoG used for reserves that in turn would potentially convert Measured and Indicated Resources into Proven and Probable Reserves, potential increases to reserves by refining the pit design, and potential expansion of the deposit upon completion of the exploration drilling program currently underway at the Project), plans for a proposed infill drilling program and its estimated cost and start date and the availability of permits for such program, the expected timing to file the NI 43-101 Technical Report on SEDAR, the expected potential of the Project, anticipated opportunities to enhance the Project based on the bankable feasibility study results, planned drill targets for the exploration drilling program currently underway at the Project, the expected design of the mining operation, expected processing methods and estimated recoveries, the realization of Mineral Resources and Reserve estimates, the timing and amount of estimated future production, costs of production, capital, operating and exploration expenditures, requirements for additional capital, government regulation of mining operations, environmental risks, reclamation expenses, title disputes or claims, and the realization of the expected economics of the Project, as well as management's objectives, strategies, beliefs and intentions. Forward‐looking statements are frequently identified by such words as "may", "will", "plan", "expect", "anticipate", "estimate", "intend" and similar words referring to future events and results.
Forward‐looking statements are based on the current beliefs, opinions and expectations of management at the time such statements are made. Forward-looking statements involve risks and uncertainties and there are other factors that may cause actual results to be materially different from those expressed or implied by such forward-looking statements, including: that a mine construction decision will be made by Columbus and Nordgold, that all necessary permits for mine construction or otherwise will be approved and granted on a timely basis for the Project, that skilled personnel and contractors will be available as mine construction and subsequent operations move forward, that the price of gold will be at levels that render the Project economic, that Columbus will successfully raise the capital (through debt, equity or other means) required to fund its proportionate share of expenditures for the Project in order to construct the mine, realize on the Mineral Resource and Mineral Reserve Estimates, realize on current mine plans, and prevent dilution of Columbus' 50.01% proportionate interest in the Project as provided for in the form of shareholders' agreement to be entered into with Nordgold pursuant to Nordgold's acquisition of a 55.01% interest in the Project, that the assumptions contained in the NI 43-101 Technical Report to be filed on SEDAR within 45 days after the date of this news release will be accurate and complete, the speculative nature of mineral exploration and development, changes in project parameters and/or economic assessments as plans continue to be refined, uncertainties of project cost overruns or unanticipated costs and expenses, the ongoing cooperation of Columbus and Nordgold, uncertainties inherent in conducting operations in a foreign country, fluctuating metals prices, general business, economic, competitive, political and social uncertainties, actual results of future or current exploration activities, possible variations of mineral grade or recovery rates, the failure of plant, equipment or processes to operate as anticipated, and other risks associated with the development and operation of a mining project generally.
Actual events or results may differ materially from those projected in the forward‐looking statements. As such, we caution the reader against placing undue reliance on any forward looking statements or information included herein. The foregoing list is not exhaustive and Columbus undertakes no obligation to update any of the foregoing except as required by applicable law.
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