Mayfair Delivers Robust Pre-Feasibility Study for the Fenn-Gib Gold Project
All amounts are in Canadian Dollars unless otherwise noted
-
Base Case -
US$3,100 /oz Au and C$/US$ exchange rate of 1.35:-
After-Tax NPV
(5%)
:
$652 million - Payback Period: 2.7 years
- NPV to Capex: 1.4x
-
Cumulative Free Cash Flow1 Years 1-6:
$896 million
-
After-Tax NPV
(5%)
:
Highlights of the 2026 PFS for the
-
After-tax NPV
(5%) of
$652 million , IRR of 24% atUS$3,100 /oz base case gold price and1.35 C$ /US$ exchange rate2 -
After-tax NPV
(5%) of
$1.37 billion , IRR of 38% atUS$4,450 /oz spot gold price3 and1.38 C$ /US$ exchange rate -
Average grade processed of 1.47 g/t gold over the first 6 years of operations for average annual gold production of 71,336 ounces at an AISC4 of
US$1,171 /oz -
Average grade processed of 1.29 g/t gold over the 14.3-year reserve life for average annual gold production of 64,096 ounces at an AISC of
US$1,292 /oz -
Free cash flow in the first 6 years of operation of over
$896 million at base case gold price and$1.43 billion at spot gold price -
Initial development capital costs of
$450 million - Short payback period of 2.7 years on base case, dropping to 1.7 years at spot gold
- Mine plan and associated economics only exploit 1.04 Moz (24%) of the total 4.3 Moz Indicated Resource, preserving optionality for future growth
-
Environmental Baseline studies well advanced to allow for early 2026 commencement of Environmental Assessment and
Ontario permitting process - Final investment decision expected within 3 years with commercial operation within 5 years5
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_________________________________ |
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1 Cumulative Free Cash Flow ("FCF") is defined as calculated as cash flows from operating activities less capital expenditures. Refer to the "Non-GAAP Financial Measures" section of this news release for more information. |
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2 See Table 2: sensitivity table below for various scenarios if gold prices change |
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3 Spot Gold price and C$/US$ exchange rate as of |
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4 All-in sustainable cost ("ASIC") includes mining, processing and administrative costs, royalties, production taxes, sustaining capital expenditures, closure allowance, and other costs necessary to maintain planned production. Refer to the "Non-GAAP Financial Measures" section of this news release for more information. |
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5 See Cautionary Note Regarding Forward Looking Information |
The PFS lead author was Ausenco Engineering ULC. ("Ausenco") with contributions from Knight Piésold Ltd. ("KP"),
Fenn-Gib PFS Highlights and Mayfair's Strategic Approach to
The study outlines Mayfair's strategy to reduce execution risk and prioritizing high-margin material early in the mine plan, supported by a realistic and financeable initial capital outlay. This approach enables rapid value generation from Fenn-Gib while preserving long-term flexibility to deploy free cash flow toward regional growth opportunities or advancing secondary assets to diversify and expand production.
Economic results are presented on an unlevered basis to highlight the strong standalone project returns. Mayfair intends to prudently utilize project-level debt and other financing options to minimize overall cost of capital and maximize per-share economic returns.
Initial capital expenditures are estimated at
The Project will proceed under the Provincial Class Environmental Assessment (EA) process and does not trigger a Comprehensive EA or federal Impact Assessment under current regulations.
Social and community engagement has focused primarily on the Apitipi Anicinapek Nation (AAN) due to its proximity to the Fenn-Gib site. The Company and AAN have an active Exploration Agreement in place and will continue to advance consultation collaboratively, with the intention of developing a Community Benefit Agreement for the Project.
The Project plans to advance three key strategies in parallel:
The 2026 PFS assumes an average annual gold production of 71.3 koz over the first 6-years of operation and a total life of mine ("LOM") production of 920 koz over 14.3 years of operation.
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Description |
Unit |
Base Case |
Spot Price |
|
General Assumptions |
|
|
|
|
|
yrs |
14.3 |
|
|
Gold Price |
US$/oz |
|
|
|
Exchange Rate |
C$/US$ |
1.350 |
1.376 |
|
Canadian Dollar Gold Price |
$/oz |
|
|
|
Daily Throughput |
t/d |
4,800 |
|
|
Annual Throughput |
k t/a |
1,750 |
|
|
Years 1-6 |
|
|
|
|
Strip Ratio |
w:o |
7.7 |
|
|
Average Gold Grade |
g/t |
1.47 |
|
|
Average Gold Recovery |
% |
88.7 |
|
|
Average Annual Gold Production |
k ozs Au |
71.3 |
|
|
All-in Sustaining Cost (AISC) |
US$/oz |
1,171 |
1,173 |
|
Average Annual Free Cash Flow (FCF)1 |
$ M |
|
|
|
Cumulative FCF |
$ M |
|
|
|
Life of Mine |
|
|
|
|
Strip Ratio |
w:o |
6.0 |
|
|
Average Gold Grade |
g/t |
1.29 |
|
|
Average Gold Recovery |
% |
88.3 |
|
|
Average Annual Gold Production |
k ozs Au |
64.1 |
|
|
AISC |
US$/oz |
|
|
|
Average Annual FCF |
$ M |
|
|
|
Cumulative FCF |
$ M |
|
|
|
Initial Capital Costs |
$ M |
|
|
|
Sustaining Capital Costs |
$ M |
|
|
|
Closure Costs |
$ M |
|
|
|
Payback Period (after tax) |
Years |
2.7 |
1.7 |
|
NPV (5%) (after-tax) |
$ M |
|
|
|
IRR (after tax) |
% |
24.1 |
38.0 |
|
Note: |
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Assumes site royalty as per agreements with no buy-back; key consumables of |
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Source: Mayfair, 2025 |
The base case economics have been calculated on an unlevered basis, based on a gold price of
Free cash flow ("FCF") after working capital changes is expected to amount to
The mine plan and associated economics reflect total gold processing of 1.04 Moz with 88.3% recovery. This represents only 24% of the
The tables below highlight NPV, IRR and payback sensitivity to operating expenses, capital expenditures, foreign exchange rates and the gold price. On average, every
|
After-Tax Results |
OPEX Sensitivity |
|
|
||||
|
-30 % |
-15 % |
0 % |
15 % |
30 % |
|
|
|
|
NPV 5% (M $) |
826 |
739 |
652 |
564 |
476 |
|
|
|
IRR (%) |
27.7 % |
25.9 % |
24.1 % |
22.1 % |
20.0 % |
|
|
|
Payback (yrs) |
2.4 |
2.5 |
2.7 |
2.9 |
3.2 |
|
|
|
|
|
|
|
|
|
|
|
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After-Tax Results |
CAPEX Sensitivity |
|
|
||||
|
-30 % |
-15 % |
0 % |
15 % |
30 % |
|
|
|
|
NPV 5% (M $) |
773 |
713 |
652 |
591 |
530 |
|
|
|
IRR (%) |
34.2 % |
28.4 % |
24.1 % |
20.7 % |
17.8 % |
|
|
|
Payback (yrs) |
1.9 |
2.3 |
2.7 |
3.1 |
3.6 |
|
|
|
|
|
|
|
|
|
|
|
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After-Tax Results |
FX Sensitivity |
|
|
||||
|
1.25 |
1.30 |
1.35 |
1.40 |
1.45 |
|
|
|
|
NPV 5% (M $) |
536 |
594 |
652 |
710 |
767 |
|
|
|
IRR (%) |
21.4 % |
22.7 % |
24.1 % |
25.4 % |
26.6 % |
|
|
|
Payback (yrs) |
3.0 |
2.8 |
2.7 |
2.6 |
2.5 |
|
|
|
|
|
|
|
|
|
|
|
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After-Tax Results |
Gold Price Sensitivity (US$/oz) |
||||||
|
1,600 |
2,100 |
2,600 |
3,100 |
3,600 |
4,100 |
4,600 |
|
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NPV 5% (M $) |
-141 |
144 |
399 |
652 |
903 |
1,155 |
1,405 |
|
IRR (%) |
N/A |
10.3 % |
17.9 % |
24.1 % |
29.4 % |
34.3 % |
38.6 % |
|
Payback (yrs) |
N/A |
5.2 |
3.5 |
2.7 |
2.2 |
1.9 |
1.7 |
Mineral Resource Estimate
|
Resource |
Cut-Off |
Tonnes |
Gold Grade |
Contained Gold |
|
Indicated |
0.3 |
181.3 |
0.74 |
4.3 |
|
Inferred |
0.3 |
8.9 |
0.49 |
0.1 |
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Notes: |
|
|
1. |
Effective date of this updated mineral resource estimate is |
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2. |
All mineral resources have been estimated in accordance with the CIM Definitions Standards, as required under National Instrument (NI) 43-101. Mineral Resource Statement prepared by |
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3. |
Mineral Resources reported demonstrate reasonable prospect of eventual economic extraction, as required under NI 43-101. Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. |
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4. |
Mineral Resources are reported at a cut-off grade of 0.30 g/t Au for an open-pit mining scenario using a 50° pit slope angle. Cut-off grades are based on a price of |
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5. |
Troy ounce = tonnes x grade / 31.10348. All numbers have been rounded to reflect the relative accuracy of the estimate. |
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6. |
The quantity and grade of reported Inferred Resources are uncertain in nature and there has not been sufficient work to define these Inferred Resources as Indicated or Measured Resources. It is reasonably expected that many of the Inferred Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration. |
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7. |
Tonnages and ounces in the tables are rounded to the nearest thousand. Numbers may not total due to rounding. |
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Source: TMAC, 2025 |
Maiden Mineral Reserve Estimate
The Fenn-Gib Mineral Reserves estimate is based on a design metal price of
|
Reserve Class |
Process Feed |
Gold Grade |
Contained Gold |
|
Proven |
- |
- |
- |
|
Probable |
25.13 |
1.29 |
1.04 |
|
Total Reserves |
25.13 |
1.29 |
1.04 |
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Notes: |
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1. |
This mineral reserve estimate has an effective date of |
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2. |
The Mineral Reserve estimation was completed under the supervision of |
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3. |
Mineral Reserves are stated within the ultimate design pit based on: |
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|
|
a. |
|
|
|
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b. |
Pit Limit corresponds to a pit shell with a revenue factor of 0.55, corresponding to a price of |
|
|
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c. |
An elevated cut-off grade of 0.80 g/t Au for all pit phases. |
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|
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d. |
Preliminary mining cost assumptions of |
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|
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e. |
Preliminary processing cost assumptions of |
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|
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f. |
Preliminary process recovery assumptions of 92.6% for gold. |
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|
|
g. |
An exchange rate of |
|
|
|
h. |
The preliminary economic, cost and recovery assumptions used at the time of mine planning and reserve estimation may not necessarily conform to those stated in the economic model. |
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4. |
Pit slope inter-ramp slope angle assumptions ranged from 49 - 65° and overall slope angles ranging from 40 - 51° in rock. |
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Source: AGP, 2025 |
The initial capital cost (Capex) is estimated at
The main construction period, excluding early works is estimated at 18 to 24 months.
Sustaining Capital includes mining fleet additions and replacement, highway relocation and future TSF dam raises and associated construction. No provision has been made for potential plant expansion capital.
|
WBS Description |
|
Sustaining Capital ($ M) |
Total Capital ($ M) |
|
Mining |
31.4 |
24.4 |
55.8 |
|
Crushing |
21.6 |
1.1 |
22.7 |
|
Process Plant |
114.7 |
1.4 |
116.1 |
|
On-Site Infrastructure |
72.4 |
14.6 |
87.0 |
|
Off-Site Infrastructure |
15.6 |
13.3 |
28.9 |
|
Total Direct Costs |
255.8 |
54.7 |
310.5 |
|
Project Preliminaries |
35.9 |
0.0 |
35.9 |
|
Project Delivery |
30.7 |
2.5 |
33.3 |
|
Owner's Costs |
61.7 |
3.7 |
65.3 |
|
Total Indirect Costs |
128.3 |
6.2 |
134.5 |
|
Total Direct + Indirect Costs |
384.1 |
60.9 |
444.9 |
|
Contingency |
65.9 |
0.0 |
65.9 |
|
Total Capital Cost |
450.0 |
60.9 |
510.9 |
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Note: |
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Capex period ends at completion of commissioning with no allowance for pre-production cost and revenue |
LOM unit operating costs are estimated at
|
Description |
Unit |
Life-of-Mine Average |
|
Operating Costs |
|
|
|
|
$/t mined |
4.53 |
|
$/t processed |
30.66 |
|
|
Processing Cost |
$/t processed |
19.22 |
|
G&A Cost |
$/t processed |
6.82 |
|
Royalties and Refining Cost |
$/t processed |
2.73 |
|
Total Operating Cost |
$/t processed |
59.43 |
|
Cash Costs and All-In Sustaining Costs1 |
|
|
|
Cash Costs1 |
US$/oz Au |
1,203 |
|
All-In Sustaining Cost (AISC)1 |
US$/oz Au |
1,292 |
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1 See on non-GAAP terms contained at the end of the News Release |
Fenn-Gib Production Profile
The PFS outlines a production profile based on a high-grade open pit with a projected operating mine life of 14.3 years, averaging 1.29 g/t Au and an anticipated metallurgical recovery averaging 88.3%. During the first 6 years of operations (years 1-6), annual gold production is expected to average 71,336 oz at a feed grade of 1.47 g/t, with peak output of over 82,000 oz in year 2. The mined Reserves represent only 24% of the overall 4.3 Moz Indicated Mineral Resource.
Mining
The Fenn-Gib mine design is based on a conventional truck-and-shovel open-pit operation. The mine plan incorporates an elevated, operating cut-off grade (COG) of 0.8 g/t Au and is structured into three primary mining phases with two smaller satellite pits. Total mined tonnes peak at 16 Mt per year or approximately 44 kt per day.
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____________________________ |
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6 *Mineralized waste is not processed in the PFS mine plan. This material falls below the elevated cut‑off grade used for plant feed but remains above the economic cut‑off grade. At the end of the mine life, approximately 27 Mt of this material is stockpiled at an average grade of 0.51 g/t |
In total, waste material mined over the LOM is estimated at
Processing and Recovery
The PFS process plant design for Fenn-Gib is based on metallurgical testwork completed to date and is considered a conventional metallurgical flowsheet to treat gold ore to produce doré bars. The circuit consists of crushing and grinding targeting 80% passing grind size (P80) of 106 µm, sulphide flotation at a mass pull of between 23 to 29%, rougher concentrate regrinding targeting P80 of 13 µm and cyanidation, carbon-in-leach (CIL) adsorption, desorption and regeneration, with cyanide detoxification of the CIL tailings. The design also considers the addition of a gravity concentration circuit in the future. The overall metallurgical recovery of 89.6% Au is expected for a head grade of 1.5 g/t Au.
The PFS plant design incorporates modularization concepts for key equipment and infrastructure. Modularization offers several potential benefits, including reduced construction timelines, improved cost predictability, and enhanced quality control through off-site fabrication. This approach also minimizes on-site labour requirements and mitigates weather-related delays, supporting a more efficient and streamlined project execution.
Infrastructure
Site access will be via
Tailings and waste management will utilize a paddock-style Tailings Storage Facility (TSF) constructed using a downstream design, which is widely regarded as the preferred approach for long-term stability. The TSF design incorporates extensive site investigations completed as part of the PFS work, ensuring that geotechnical, hydrological, and environmental conditions are fully considered. The facility is engineered for co-disposal of tailings and Potentially Acid Generating (PAG) mine rock, with staged construction and integrated water reclaim systems.
The site layout includes designated mine rock storage areas and overburden stockpiles, along with water management systems designed to capture runoff and seepage. These systems will incorporate water management ponds and a treatment plant.
Construction power requirements of approximately 3 MW will be supplied via a grid connection early in the construction phase, with provisions for emergency backup power to ensure continuity. For operations, the site will require approximately 16 MW of power, with the preferred solution being a Hydro One grid connection through a 27.6 kV line from the
A construction camp (owned and operated by a third-party) is anticipated to be located off-site in Matheson, and no operations camp is planned at this time.
Environmental and Permitting
Extensive baseline environmental studies have been underway since 2021, covering terrestrial and aquatic ecosystems, including Species at Risk, groundwater, air quality, noise, geochemical characterization, and cultural heritage resources. Follow-up studies continued through 2025 and are planned to extend into 2026. Results indicate environmental conditions typical of northeastern
The Project is anticipated to proceed through the Provincial Class Environmental Assessment (EA) process and not trigger an Individual EA under provincial requirements or a federal Impact Assessment (IA) under the Impact Assessment Act.
Early engagement with regulators has commenced, and the Company is in discussions with the
Community and Indigenous Affairs
Social and community engagement has focused primarily on the Apitipi Anicinapek Nation (AAN) due to its proximity to the Fenn-Gib site. The Project is situated within Treaty 9 territory, approximately 20 km from the AAN community and within their traditional lands. The Company and AAN have an active Exploration Agreement in place and will continue to advance consultation collaboratively, with the intention of developing a Community Benefit Agreement for the Project. In addition, the Project is approximately 17 km from the Town of Black River-Matheson and anticipates utilizing and contributing to the services and infrastructure of the Town. A 'good neighbour' agreement with the Town of Black River-Matheson is anticipated.
Engagement with the identified regional Indigenous communities and local stakeholders will commence upon submission of the Environmental Assessment documentation. The Company is committed to transparent communication regarding the
Project Timelines and
The Project plans to advance three key strategies in parallel:
Beginning in early 2026, the Project will move into front-end engineering, followed by detailed engineering and long-lead, critical-path procurement activities. It is anticipated that the Project control estimate will be finalized with 70% to 100% engineering completion and critical construction and supply contracts in place.
Project designs related to environmental aspects of the Project and the permitting tasks are expected to be the critical path for construction commencement.
The Project is envisioned to achieve commercial production within a five-year timeframe
Technical Report Preparation and Qualified Persons
The Pre-Feasibility Study and Mineral Reserves have an effective date of
For readers to fully understand the information in this news release, they should review the technical report that will be filed within 45 days in its entirety, including all qualifications, assumptions, exclusions, and risks. The report is intended to be read as a whole, and individual sections should not be relied upon out of context.
The Qualified Persons ("QPs") responsible for the Study include:
-
Tommaso Roberto Raponi ,P.Eng ., (Ausenco) – process plant design, process infrastructure, metallurgy, recovery methods, and operating (plant and G&A) cost estimates, financial analysis -
Gordon Zurowski ,P.Eng ., (AGP) – mineral reserves, mining methods, mine design, and capital and operating costs related to the mine, as well as contribution to the economic analysis -
Craig Hall ,P.Eng . andRichard Cook ,P.Geo . (Ltd.) (KP) – tailings and water management design, geotechnical aspects, environmental and permitting considerations and closure cost estimates -
Sarah Barabash ,P.Geo . (Ltd.) (Ecometrix) – geochemistry -
Tim Maunula ,P.Geo . (TMAC) – mineral resource estimation and geological interpretation
Full detail of areas of responsibility of the QPs can be found in the Technical Report.
The content of this news release from the Study has been reviewed and approved by the QPs who authored the Study. In addition,
Prefeasibility Study Conference Call
The Company will hold a conference call and webcast to discuss the financial results on
Conference Call
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Participant Dial In (Toll Free): |
1-866-807-9684 |
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Participant International Dial In: |
1-412-317-5415 |
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Participants, please ask to join to the Mayfair Gold Fenn-Gib Pre-Feasibility Conference Call. |
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Webcast
Webcast URL: https://event.choruscall.com/mediaframe/webcast.html?webcastid=mMj3MwRo.
Replay Information
A conference call and webcast replay will be available until
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US/Canada Toll Free: |
1-855-669-9658 |
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International Toll: |
1-412-317-0088 |
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Replay Access Code: |
2186285 |
Engaging Investor Relations and Communication Advisory Services
As part of its strategy to enhance communication and engagement with investors and other stakeholders following its transition year in 2025, Mayfair has engaged several investor relations and capital markets consultants.
Mayfair has entered into an agreement with
In addition, Mayfair has entered into an agreement with
Lastly, Mayfair has entered into an agreement with
About
Cautionary Notes to U.S. Investors Concerning Resource Estimates
This news release has been prepared in accordance with the requirements of the securities laws in effect in
Use of Non-GAAP Measures
Certain financial measures referred to in this news release are not measures recognized under IFRS (as defined below) and are referred to as non-GAAP financial measures or ratios. These measures have no standardized meaning under IFRS and may not be comparable to similar measures presented by other companies. The definitions established and calculations performed by Mayfair are based on management's reasonable judgement and are consistently applied. These measures are intended to provide additional information and should not be considered in isolation or as a substitute for measures prepared in accordance with IFRS.
The non-GAAP financial measures used in this news release and common to the gold mining industry are "free cash flow", "Cumulative Net FCF", "Average Annual FCF", "ASIC" and "all-in sustaining cost per ounce of gold sold". These measures are non-GAAP financial measures and have no standardized meaning under IFRS Accounting Standards ("IFRS") and may not be comparable to similar measures used by other issuers.
Operating Costs include the direct costs of mining, processing, and site administration. Cash Costs include Operating Costs plus royalties and production taxes. AISC includes mining, processing and administrative costs, royalties, production taxes, sustaining capital expenditures, closure allowance, and other costs necessary to maintain planned production. Free Cash Flow is calculated as cash flows from operating activities less capital expenditures and is intended to provide an indication of the cash generated by the project.
As the Company is not in production, it does not have historical non-GAAP financial measures nor historical comparable measures under IFRS, and therefore the foregoing prospective non-GAAP financial measures or ratios may not be reconciled to the nearest comparable measures under IFRS.
Cautionary Note Regarding Forward Looking Information
This news release contains forward-looking information which reflects management's expectations regarding the Company's growth, results of operations, performance and business prospects and opportunities. Forward-looking information in this news release includes, but is not limited to, statements regarding the design, development and execution of the Project, the PFS demonstrating the strong economics and free cash flow potential associated with developing the Project as a targeted, high-grade operation that can be advanced through the
Forward-looking information is based on various reasonable assumptions including, without limitation, the expectations and beliefs of management; the assumed long-term price of gold; that the Company can access financing, appropriate equipment and sufficient labour; and that the political environment where the Company operates will continue to support the development and operation of mining projects. Should underlying assumptions prove incorrect, or one or more of the risks and uncertainties described below materialize, actual results may vary materially from those described in forward-looking statements.
Forward-looking information is subject to a variety of risks and uncertainties which could cause actual events or results to differ from those reflected in the forward-looking information, including, without limitation, risks and uncertainties relating to foreign currency fluctuations; risks inherent in mining including environmental hazards, industrial accidents, unusual or unexpected geological formations, ground control problems and flooding; delays or the inability to obtain necessary governmental permits or financing; risks associated with the estimation of mineral resources and reserves and the geology, grade and continuity of mineral deposits; the possibility that future exploration, development or mining results will not be consistent with the Company's expectations; the potential for and effects of labor disputes or other unanticipated difficulties with or shortages of labor; failure of plant, equipment or processes to operate as anticipated; actual ore mined varying from estimates of grade, tonnage, dilution and metallurgical and other characteristics; the inherent uncertainty of production and cost estimates and the potential for unexpected costs and expenses, gold price fluctuations; uncertain political and economic environments; and changes in laws or policies.
The Company undertakes no obligation to publicly update or review the forward-looking information whether as a result of new information, future events or otherwise, other than as required under applicable securities laws. The forward-looking information reflect management's beliefs, opinions and projections as of the date of this news release.
Neither the
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