Florida Canyon Mine
- Location: 210 km (128 miles) NE of Reno, Nevada, with freeway access
- Area: Approx 71.4 sq km (27.5 sq miles)
- Minerals: Gold, Silver
- Ownership: 100%
- Status: Operating Gold (Silver) Mine
Florida Canyon Mine Location and Background
The Florida Canyon mine is located half way between Lovelock and Winnemucca, Nevada, and approximately 30 kilometres north of the Company’s Wilco, Lincoln Hill and Gold Ridge projects. The mine sits immediately adjacent to Interstate 80 and is located approximately 210 kilometres northeast of Reno, Nevada.
Currently, the mine is producing from its existing leach pad facilities. The Company proposes to construct a new heap leach pad and waste storage facility to complete a planned layback of the existing pit area. Initial production from the new leach pad is expected within six months and commercial production growing toward 75,000 ounce of gold per annum is expected three months later. The expansion is fully permitted, and the Credit Facility from Macquarie Bank will be used for the build out.
Rye Patch expects to have cash flow from a producing mine and from its existing NSR royalty along with a pipeline of advanced-projects to ensure future growth. Significant operational synergies exist with Florida Canyon and the nearby Lincoln Hill and Wilco resource projects. Oxide resources at Lincoln Hill and Wilco represent additional volume that could contribute to increasing future gold output. The infrastructure at Florida Canyon is capable of reducing capital and costs for the Lincoln Hill and Wilco projects by utilizing the existing assay lab, carbon stripping plant, refinery and management, thereby potentially reducing the timeline to production for these assets.
Florida Canyon Mine: Restart Commenced Spring 2017
The Florida Canyon gold mine is fully permitted and began production under Rye Patch gold after a rehabilitation period in the spring of 2017. Rye Patch expects Florida Canyon to achieve commercial production from the new leach pad in Q1 2018.
Mine Development Associates (“MDA”) completed a Preliminary Economic Assessment with an effective date of March 16, 2016, (the “PEA”) for the Florida Canyon gold mine. The PEA was completed based on a US$1,000 per ounce gold price for the first two years and a US$1,150 per ounce gold price for the remaining life of mine.
PEA and Acquisition Highlights:
- Average production of approximately 75,000 ounces of gold per year for 8 years;
- US$1,000 per ounce of Au for years 1 to 2 and US$1,150 per ounce of Au used for years 3 to 8;
- Pre-tax NPV (7.5%) of US$65.43 million, with a 41.5% IRR;
- Cash cost per gold ounce is calculated at US$759 per ounce;
- Fully permitted expansion;
- Commitment letter executed for a US$27 million Credit Facility;
- Significant potential synergies with existing Oreana Trend assets; and
- Tremendous exploration and further development potential.
|Table 1: PEA Sensitivity Analysis (AFTER TAX)|
|% of Base Case||NPV7.5%
Yr 1 & 2
After Yr 2
See “Preliminary Economic Assessment on Florida Canyon Mine” below for further details on the PEA and, specifically, the cautionary language regarding the preliminary nature of the PEA in that it is based on Inferred Mineral Resources and not mineral reserves, and the risk associated with putting a mine in production based on a PEA.
All mining and ancillary equipment required to operate the Florida Canyon mine is in place together with a team of highly qualified experts experienced in mining a low cost operation with a successful 30 year history.
Macquarie Bank Credit Facility
To partially fund the proposed redevelopment of the Florida Canyon gold mine, the Company has executed a commitment letter with Macquarie Bank for a US$27 million Credit Facility for the Company’s wholly owned US subsidiary, Rye Patch Mining U.S. Inc. (“Rye Patch U.S.”). The Credit Facility will bear interest at LIBOR plus 8% per annum and includes a hedging facility. Repayment of the Credit Facility will be amortized over the first four years of production following the restart of the Florida Canyon mine, subject to prepayment from a percentage of excess free cash flow from the mine, with the final repayment date expected to be no later than December 31, 2020.
Rye Patch U.S.’s obligations under the Credit Facility will be guaranteed by the Company and certain material subsidiaries. In addition, Macquarie Bank will be taking a first ranking security interest over all of the properties and assets of the Company and its material subsidiaries, including the Florida Canyon mine property and assets as well as shares of the subsidiary companies that hold the property and assets.
The acquisition of the Florida Canyon mine was made pursuant to the Acquisition Agreement dated May 25, 2016, among the Company and Rye Patch U.S., and Jipangu International Inc. (“JII”), Imlay Mining Co., Ltd. (“Imlay”) and ADM ‘Gold Co., Ltd. (“ADM Gold”), whereby Rye Patch U.S. will acquire all of the outstanding shares of the companies which own the Florida Canyon mine and related assets (including the nearby Standard gold mine). The Acquisition Agreement includes the following provisions:
- Consideration payable under the Acquisition Agreement to ADM ‘Gold and/or affiliated entities on closing is comprised of US$15 million payable in cash and issuance of 20,000,000 common shares of Rye Patch , provided that Rye Patch U.S. will be entitled to hold back approximately US$3.85 million of the cash consideration pending the determination of outstanding liabilities.
- Within 60 days of commencement of commercial production at the Florida Canyon mine by Rye Patch U.S. as operator:
- Rye Patch U.S. is to pay additional consideration to ADM ‘Gold of US$5 million in cash (the “Cash Contingent Consideration”), subject to adjustment depending on the amount of outstanding liabilities to third parties that have not then been settled or waived and postponement in certain circumstances.
- Rye Patch is to issue to ADM ‘Gold warrants exercisable for 15,000,000 common shares of Rye Patch at US$0.50 per share for a two year term from date of issuance.
- The Cash Contingent Consideration payable to ADM ‘Gold may be alternatively satisfied by the issuance of:
- US$2.5 million worth of common shares of Rye Patch at a price per share based on the 20 day volume weighted average price of the shares for the 20 trading days prior to the commencement of commercial production, and
- An unsecured debt obligation for US$2.5 million (subject to adjustment for outstanding liabilities) maturing five years after commencement of commercial production, subject to mandatory prepayment from certain levels of uncommitted free cash flow from the mine, and bearing 4% interest per annum in the first year and 9% interest per annum thereafter with interest to be paid quarterly in cash.
- Closing of the acquisition occurred on July 28, 2016.
Preliminary Economic Assessment on Florida Canyon Mine
Table 2 summarizes the base case production and financial parameters used in the PEA.
|Table 2: Summary of Base Case Assumptions|
|Gold Price (US$)||$1,000 (yrs 1&2)
$1,150 (yr 3 to 8)
|Average Annual Gold Production (ounces)||75,000|
|Pre-Production Capital Costs (US$)||$25.2 million|
|LOM Sustaining Capital (US$)||$23.9 million|
|Pre-Production Period (years)||0.5|
|Mine Life (years)||8|
|Cash Cost per Gold Ounce (US$)||$759|
|Life of Mine NPV at 7.5% Discount Rate (US$)||$65.4 million|
|Internal Rate of Return||41.5%|
|Life of Mine NPV at 7.5% Discount Rate (US$)||$45.8 million|
|Internal Rate of Return||34.4%|
The Company cautions that the PEA is preliminary in nature in that it is based on Inferred Mineral Resources, which are considered too speculative geologically to have the economic considerations applied to them that would enable them to be characterized as mineral reserves, and there is no certainty that the PEA will be realized. Mineral resources that are not mineral reserves do not have demonstrated economic viability.
The Company’s decision to place the Florida Canyon mine into production is not based on a feasibility study of mineral reserves demonstrating economic and technical viability, and the Company cautions that historically such projects have a much higher risk of economic or technical failure.
The Florida Canyon mine PEA was prepared by Mine Development Associates under the direction of Neil B. Prenn, PE, and incorporates the work of a number of industry-leading consultants, all of which are Qualified Persons (as defined under National Instrument 43-101) and are independent of Rye Patch.
MDA prepared the PEA as an open-pit mining project based solely on the Measured and Indicated Resources reported in the March 16, 2016, PEA. Caterpillar 992 and 993 wheel loaders and 785 haul trucks will be used to mine the ore body. Material would then be transported and processed through a two-stage crusher and crushed to -38 mm (-1.5 inches). The ore will be placed on the newly constructed South Heap Leach Pad Facility (“SHLP”) using 777 Caterpillar haul trucks. Metal would be recovered onsite and sold as gold-silver dor —. All necessary mine infrastructure and equipment is on the mine site.
The average annual production is expected to be 7.2-million tons (6.5-million tonnes) at a contained gold grade of 0.013 ounces per ton (0.445 grams per tonne). Based on gold recovery, it is anticipated that the mine will produce and sell an average of approximately 75,000 ounces of gold annually for an eight-year period.
Certain metric references in this news release have been converted from imperial amounts indicated in the PEA.
In March 2016, MDA completed a National Instrument 43-101-compliant PEA report for the Florida Canyon mine titled “Technical Report – Preliminary Economic Assessment for the Florida Canyon Mine, Pershing County, Nevada USA”. On January 27, 2016, MDA completed an “Amended Technical Report – Preliminary Economic Assessment for the Florida Canyon Mine, Pershing County, Nevada USA”.
In their analysis, MDA reported mineral resources at a cut-off grade of 0.006 oz Au/ton (0.2 grams of gold/tonne) for oxide material (Tables 3.1 and 3.2).
Table 3.1: Florida Canyon January 27, 2017, Measured and Indicated Oxide Resources
(0.006 oz Au/ton cutoff grade)
|Measured + Indicated||84,202.1||0.013||1,126.6|
Table 3.2: Florida Canyon January 27, 2017, Inferred Oxide Resources
(0.006 oz Au/ton oxide cutoff grades)
|Total Inferred Resource||350.8||0.015||5.3|
The Amended Technical Report reflects a change to the resources reported in the March 2016 Report in that all sulfide material has been removed from the tabulation of Inferred resource. This change does not impact the results of the Preliminary Economic Assessment (“PEA”) included in the March 2016 Report since sulfide material was not included within the economic analysis.
The current resources at Florida Canyon are based on a grade block model produced by Reserva International LLC (“Reserva”) in 2009. The oxide resource was re-calculated in 2012 using a change in resource cut-off grade and an updated topographic surface. The current Measured, Indicated, and Inferred oxide resources were recalculated for this report based on an updated December, 2014 topographic surface and a $1200 gold price, and are restricted to that material above the 0.006oz Au/ton cut-off grade that occurs inside an optimized pit using the PEA estimated costs and process recoveries.
Florida Canyon drillhole spacing is generally 100ft x 100ft (30m x 30m) or less, and the gold domains are based on 20ft (9.1m) drill hole composites generated from capped sample interval gold assay values. The polygons were drawn enclosing two or more pierce points of the grade being modeled in a manner consistent with the orientation of mineralized bodies at Florida Canyon based on experience. These polygons were assigned a rock code based on the grade and location (Main or RTE) and validated for preparation of a block model.
The bench interpretations were used to code the drill composites and model blocks to each particular domain using the 50% majority-rule. The full block model has been re-interpolated using the new gold domain definitions, the complete drillhole data set through February 2009, and revised variography. A three-dimensional block model was built using Gemcom software by Mr. Tim Carew, P. Geo., principal of Reserva International LLC. The 2009 block model contains 333 columns, 261 rows, and 135 levels; the model block size is 30ft x 30ft x 20ft (9.1m x 9.1m x 6.1m) vertically.
The Measured oxide resource for Florida Canyon is classified as those model blocks defined by at least five composites within one-half the distance of the variogram range, and use a maximum of two composites per drillhole. This implies a minimum of three drillholes is also required.
The Indicated oxide resource for Florida Canyon is classified as those model blocks defined by at least three composites within the full distance of the variogram range, and use a maximum of two composites per drillhole. This implies a minimum of two drill holes is also required.
MDA did not audit the sulfide model, as it is not part of the current mining plan. Some material modeled as sulfides were included in the optimized pit, but were treated as waste in the mine schedule.
Mineral resources are not mineral reserves and do not have demonstrated economic viability.
A PEA provides a basis to estimate project operating and capital costs and establish a projection of the potential mineable resource including measured, indicated and inferred categories as permitted under National Instrument 43-101. A Whittle pit optimization was performed using estimates of operating costs typical of operating surface mines using heap leach processing in northern Nevada and using metallurgical recovery based on 30 years of recovery history and column leach test work performed on material from the Florida Canyon mine. The ultimate pit shell was determined using a gold price of US$1,150 per ounce and only the Measured and Indicated oxide resources shown above in Table 3.1 were used for production scheduling.
No inferred material was used in the financial modeling. The strip ratio for the economic pit is 1.47 tons of waste for every one ton of ore.
The Florida Canyon mine has been in continuous operation since 1986, and a total of 2.2875Mozs of gold have been produced from the operation. For the 30-year period, gold recoveries have reached an average of 68.3% on a combination of crushed and run-of-mine (“ROM”) material (recovery of 50% for ROM and 71% for crush). The Company’s PEA contemplates placing only crushed material on the new heap leach pad, thereby increasing the average recovery from 68% to 71.1%. Approximately 63.8 million tons (57.9 million tonnes) of new ore will be sent to the new SHLP, and 93.7 million tons (85 million tonnes) of waste will be stored in the new South Waste Rock Storage Facility. The ore material will be placed on the SHLP at a rate of 7.2 million tons (6.5 million tonnes) per annum and will be the basis for recovering metals from the Property. The crushed material gold recovery is expected at 71.1% of total placed. Recovery is expected over 30 to 45 day period, on a declining curve, from the date placed on the pad.
Each capital item has an associated quote or bid to substantiate the cost. The capital required to build the expansion includes US$5.834M for mining equipment and deferred maintenance, US$2.735M for a crusher move and upgrade, US$7.208M for new leach pad, pond and piping construction, US$3.781M for contingency and US$0.9M for miscellaneous. The total capital requirement is US$28.985 million including contingency.
Operating cost assumptions were based on similar scale surface mining operations using heap leach processing in northern Nevada, and process cost estimates for key consumables are based on the available metallurgical test data, power consumption data and prevailing costs for key materials in similar Nevada mining operations. Operating cost per ton of material processed are summarized as follows:
Table 4: PEA Pit Optimization Parameters
(dollar amounts in US$)
|Mining Cost||Rock||$1.35 to $1.65 per ton depending on location|
|Mining Cost||Fill||$1.35 per ton|
|Processing Cost||Crushing and Pad Placement||$1.10 per ton processed|
|Processing Cost||Leaching||$2.60 per ton processed|
|Processing Cost||G & A Cost||$0.50 per ton processed|
|Minimum Grade||0.006 ounce per ton|
|Gold Price||$1150 per ounce of gold|
|Selling Cost||$5.00 per ounce sold|
|Interamp Pit Slope||Rock||45 degrees|
|Interamp Pit Slope||Fill||37 degrees|
MDA chose US$1,000 per ounce for gold in years one and two, and US$1,150 per ounce for gold for years 3 through 8 as the base case economic scenario. The base case pre-tax economic results for the metal price assumptions are as follows:
Table 5: Pre Tax Projected Economic Results
(dollar amounts in US$)
|Gold Price||$1,000 (yrs 1&2); $1,150 (yr 3 to LOM)|
|Net Cash Flow||$117.2 million|
|NPV @ 5% Discount Rate||$79.3 million|
|Internal Rate of Return||41.5%|
|Operating Costs per Ounce of Gold Produced (Life-of-Mine)||$759|
Everything needed for a mine is on the mine site. The Florida Canyon mine is adjacent to a major transportation and services corridor. The mine is within one mile of Interstate 80, the Union Pacific Railroad, and NV Energy transmission lines. All requirements for energy, water and process materials are available, and services are established. Nevada has a large, well-established gold mining industry. Services, supplies, manpower, housing, equipment and venders are readily available within the state.
The existing waste rock storage facilities are in the process of closure and have been reclaimed, and the existing leach pad is at capacity.
A new 300 acre (121.4 hectare) heap leach facility (SHLP) is fully permitted. The SHLP is divided into three cells each covering 100 acres (40.5 hectares). The first cell will be constructed with initial production anticipated in late 2016. The pad location and attendant facilities are fully permitted.
The process facilities consist of five sets of carbon in columns with a maximum capacity of 9,000 gpm. An ARD plant, carbon acid wash, an elution and stripping circuit, electrowinning and refinery circuit, carbon handling and regeneration circuit and an assay lab with a metallurgical lab are on site. The facility has the capacity to produce over 180,000 ounces of gold per year.
A crusher and an agglomeration and conveyor plant are presently located at the Standard Mine. The crusher and associated facilities will be moved and upgraded. The crusher capacity will be increased from 5.0M tons (4.5M tonnes) per annum to 7.2M tons (6.5M tonnes) per annum. A new lime silo for lime storage and dosing ore will be constructed.
Ancillary facilities include a maintenance shop with offices. The maintenance shop has two bays with room to work on four Cat 785 haul trucks within the bays. An administration building includes offices, meeting rooms, and a training room. There is an assay laboratory with a metallurgical lab, a technical services office for the geological staff, a security office and guard shack, and lay down yards.