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First Mining Finance Files NI 43-101 Preliminary Economic Assessment for its Springpole Gold Project Estimated after-tax NPV5% of US$792 million and 26.2% IRR for the Springpole Gold Project at

Economic Studies

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First Mining Finance Files NI 43-101 Preliminary Economic Assessment

for its Springpole Gold Project

Estimated after-tax NPV5% of US$792 million and 26.2% IRR for the Springpole Gold Project at

base case long-term precious metal prices

October 30, 2017

Vancouver, British Columbia – First Mining Finance Corp. (“First Mining” or the

“Company”) is pleased to announce that, further to the Company’s news release dated

September 21, 2017, the Company has filed on SEDAR an independent Preliminary Economic

Assessment (“PEA”) technical report for its Springpole Gold Project (the “Project”) in

northwestern Ontario, Canada that was prepared by SRK Consulting (Canada) Inc. in

accordance with National Instrument 43- 101 Standards of Disclosure for Mineral Projects (“NI

43-101”). The report, which is titled “Preliminary Economic Assessment Update for the

Springpole Gold Project, Ontario, Canada” and is dated October 16, 2017, can be found under

First Mining’s SEDAR profile at www.sedar.com, and on First Mining’s website at

www.firstminingfinance.com.

The PEA describes the potential technical and economic viability of establishing a conventional

open-pit gold mine-and-mill complex for the Project. The base case scenario utilizes long- term

metal prices of $1,300 per ounce (“oz”) of gold (“Au”) and $20 per oz of silver (“Ag”).

The PEA was prepared on a 100% ownership basis and all amounts in this news release

are stated in U.S. dollars (“USD”) unless otherwise noted.

PEA Highlights:

• Initial capital expenditure of $586 million and sustaining capital expenditures of $ 117

million for total estimated capital expenditures of $703 million over the projected 12-year

mine life (LOM). In addition, closure and reclamation costs are estimated at $20 million.

• Pre-tax Net Present V alue (“NPV”) at a 5% discount rate of $1.159 billion calculated at

the beginning of the two-year construction period and a pre-tax Internal Rate of Return

(“IRR”) of 32.3% for the base case.

• After-tax NPV at a 5% discount rate of $792 million and after-tax IRR of 26.2% for the

base case.

• Estimated payback of initial capital in 3. 5 years from the commencement of commercial

production.

• Estimated 12-year LOM operation supporting a 36,000 tonne -per-day (“tpd”) process

plant that includes cr ushing, grinding, carbon-in-pulp leaching as well as gold recovery

via activated carbon to produce doré bullion.

• LOM strip ratio of 2.1 to 1.

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• Average annual payable production projected to be 296,500 oz Au and 1,632,000 oz Ag

for LOM with average production for the nine years at full capacity of 357,100 oz Au and

2,038,800 oz Ag per annum.

• Estimated cash costs of $ 619/oz gold equivalent (“AuEq”) (cash costs include on- site

mining, processing and G&A costs, treatment and refining charges and royalties).

• “All-in” cash costs (in addition to cash costs including initial/sustaining capital and mine

closure) estimated at $806/oz of AuEq.

• Recommends moving forward with a pre-feasibility study.

Keith Neumeyer, First Mining’s Chairman, said “This updated PEA study for our Springpole

project represents a significant improvement in both economics and annual and total ounces of

gold and silver produced when compared with the previous PEA completed for Gold Canyon in

2013. The PEA demonstrates that Springpole has excel lent margins with low cash costs of

US$619 per ounce of gold equivalent and an average annual payable production of 322,000

ounces of gold equivalent, over the life of mine. On that basis, once in production as

contemplated by the PEA, Springpole would be one of the largest gold mines in North America.

We believe advancing Springpole is the best way to add considerable value for our

shareholders, and we are excited to move to the next priority items for the project, which are

permitting and completing a pre-feasibility study.”

For further detail regarding the updated PEA for Springpole, First Mining encourages readers to

review the full text of the NI 43- 101 PEA technical report, which is available on SEDAR and on

the Company’s website, and refers readers to the Company’s news release dated September

21, 2017, which contains a comprehensive summary of the PEA results.

Readers are cautioned that the PEA 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 res erves, and there is no

certainty that the PEA will be realized. Mineral resources that are not mineral reserves do not

have demonstrated economic viability. Actual results may vary, perhaps materially. The

Company is not aware of any environmental, perm itting, legal, title, taxation, socio- political,

marketing or other issue which may materially affect this estimate of mineral resources. The

projections, forecasts and estimates presented in the PEA constitute forward-looking statements

and readers are urged not to place undue reliance on such forward- looking statements.

Additional cautionary and forward- looking statement information is detailed at the end of this

news release.

Qualified Person

Dr. Chris Osterman, P.Geo., CEO of First Mining, is the “qualified person” for the purposes of NI

43-101, and he has reviewed and approved the scientific and technical disclosure contained in

this news release.

ABOUT FIRST MINING FINANCE CORP.

First Mining is a mineral property company that is evolving from a holder of mineral assets to a

project developer. The Company currently holds a portfolio of 25 mineral assets in Canada,

Mexico and the United States with a focus on gold. The core assets includ e the Springpole

Gold Project, the Goldlund Gold Project, the Cameron Gold Project and the Pickle Crow Gold

Project, all located in Ontario, and the Hope Brook Gold Project in Newfoundland.

ON BEHALF OF FIRST MINING FINANCE CORP.

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“Keith Neumeyer”

Keith Neumeyer

Chairman

For more information contact:

Derek Iwanaka

Vice President, Investor Relations

Toll-free: 1-844-306-8827

Direct: 604-639-8824

Email: [email protected]

www.firstminingfinance.com

Cautionary Note Regarding Forward-Looking Statements

This news release includes certain "forward -looking information” and "forward- looking

statements” (collectively "forward- looking statements”) within the meaning of applicable

Canadian and United States securities legislation including the United States Private Securities

Litigation Reform Act of 1995. These forward-looking statements are made as of the date of

this news release. Forward- looking statements are frequently, but not always, identified by

words such as "expects”, "anticipates”, "believes”, “plans”, “pr ojects”, "intends”, "estimates”,

“envisages”, "potential”, "possible” , “strategy”, “goals”, “objectives”, or variations thereof or

stating that certain actions, events or results "may", "could", "would", "might" or "will" be taken,

occur or be achieved, or the negative of any of these terms and similar expressions.

Forward-looking statements in this news release relate to future events or future performance

and reflect current estimates, predictions, expectations or beliefs regarding future events and

include, but are not limited to, statements with respect to: (i) the PEA representing a viable

development option for the Project; (ii) construction of a mine at the Project and related actions;

(iii) estimates of the capital costs of constructing mine facilities and bringing a mine into

production, of sustaining capital and the duration of financing payback periods; (iv) the

estimated amount of future production, both produced and metal recovered; and (vi) life of mine

estimates and estimates of operating costs and total costs, net cash flow, net present value and

economic returns from an operating mine constructed at the Project. All forward -looking

statements are based on First Mining's or its consultants' current beliefs as well as various

assumptions made by them and information currently available to them. The most significant

assumptions are set forth above, b ut generally these assumptions include: (i) the presence of

and continuity of metals at the Project at estimated grades; (ii) the geotechnical and

metallurgical characteristics of rock conforming to sampled results, including the quantities of

water and the quality of the water that must be diverted or treated during mining operations; (iii)

the capacities and durability of various machinery and equipment; (iv) the availability of

personnel, machinery and equipment at estimated prices and within the estimat ed delivery

times; (v) currency exchange rates; (vi) metals sales prices and exchange rate assumed; (vii)

appropriate discount rates applied to the cash flows in the economic analysis; (viii) tax rates and

royalty rates applicable to the proposed mining op eration; (ix) the availability of acceptable

financing under assumed structure and costs; (x) metallurgical performance; (xi) reasonable

contingency requirements; (xii) success in realizing proposed operations; (xiii) receipt of permits

and other regulator y approvals on acceptable terms; and (xiv) the fulfillment of environmental

assessment commitments and arrangements with local communities. Although the Company’s

management considers these assumptions to be reasonable based on information currently

available to it, they may prove to be incorrect. Many forward- looking statements are made

assuming the correctness of other forward looking statements, such as statements of net

present value and internal rates of return, which are based on most of the other f orward-looking

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statements and assumptions herein. The cost information is also prepared using current

values, but the time for incurring the costs will be in the future and it is assumed costs will

remain stable over the relevant period.

By their very nature, forward-looking statements involve inherent risks and uncertainties, both

general and specific, and risks exist that estimates, forecasts, projections and other forward-

looking statements will not be achieved or that assumptions do not reflect fut ure experience.

We caution readers not to place undue reliance on these forward- looking statements as a

number of important factors could cause the actual outcomes to differ materially from the

beliefs, plans, objectives, expectations, anticipations, estimates assumptions and intentions

expressed in such forward- looking statements. These risk factors may be generally stated as

the risk that the assumptions and estimates expressed above do not occur as forecast, but

specifically include, without limitation: (i) variations in rates of recovery and extraction; ( ii) the

geotechnical characteristics of the rock mined or through which infrastructure is built differing

from that predicted, the quantity of water that will need to be diverted or treated during mining

operations being different from what is expected to be encountered during mining operations or

post closure, or the rate of flow of the water being different; (i ii) developments in world metals

markets; (iv) risks relating to fluctuations in the Canadian dollar relative to the US dollar; (v )

increases in the estimated capital and operating costs or unanticipated costs; (vi ) difficulties

attracting the necessary work force; (vii) availability of necessary financing and any increases in

financing costs or adverse changes t o the terms of available financing, if any; ( viii) tax rates or

royalties being greater than assumed; (ix) changes in development or mining plans due to

changes in logistical, technical or other factors; (x) changes in project parameters as plans

continue to be refined; (xi) risks relating to receipt of permits and regulatory approvals; (xii)

delays in stakeholder negotiations (including negotiations with affected First Nation groups);

(xiii) changes in regulations applying to the development, operation, and closure of mining

operations from what currently exists; (xiv) the effects of competition in the markets in which

First Mining operates; (xv) operational and infrastructure risks; (xvi) management’s discretion to

alter the Company’s short and long term business plans; and (xvii) the additional risks described

in First Mining's Annual Information Form for the year ended December 31, 2016 filed with the

Canadian securities regulatory authoriti es u nder the Company’s SEDAR profile at

www.sedar.com, and in First Mining’s Annual Report on Form 40 -F filed with the SEC on

EDGAR.

First Mining cautions that the foregoing list of factors that may affect future resul ts is not

exhaustive. When relying on our forward- looking statements to make decisions with respect to

First Mining, investors and others should carefully consider the foregoing factors and other

uncertainties and potential events. First Mining does not undertake to update a ny forward-

looking statement, whether written or oral, that may be made from time to time by the Company

or on our behalf, except as required by law.

Cautionary Note to United States Investors

This news release has been prepared in accordance with the requirements of th e securities

laws in effect in Canada, which differ from the requirements of U.S. securities laws. Unless

otherwise indicated, all resource and reserve estimates included in this press release have been

prepared in accordance with National Instrument 43- 101 Standards of Disclosure for Mineral

Projects ("NI 43 -101”) and the Canadian Institute of Mining, Metallurgy, and Petroleum 2014

Definition Standards on Mineral Resources and Mineral Reserves. NI 43 -101 is a rule

developed by the Canadian Securities Administrators which establishes standards for all public

disclosure an issuer makes of scientific and technical information concerning mineral projects.

Canadian standards, including NI 43-101, differ significantly from the requirements of the United

States Securities and Exchange Commission ("SEC”), and mineral resource and reserve

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information contained herein may not be comparable to similar information disclosed by U.S.

companies. In particular, and without limiting the generality of the foregoing, the term "resource”

does not equate to the term "reserves”. Under U.S. standards, mineralization may not be

classified as a "reserve” unless the determination has been made that the mineralization could

be economically and legally produced or extracted at the time the reserve determination is

made. The SEC's disclosure standards normally do not permit the inclusion of information

concerning "measured mineral resources”,

"indicated mineral resources” or "inferred mineral resources” or other descriptions of the amount

of mineralization in mineral deposits that do not constitute "reserves” by U.S. standards in

documents filed with the SEC. Investors are cautioned not to assume that any part or all of

mineral deposits in these categories will ever be converted into reserves. U.S. investors should

also understand that "inferred mineral resources” have a great amount of uncertainty as to their

existence and great uncertainty as to their economic and legal feasibility. It cannot be assumed

that all or any part of an "inferred mineral resource” will ever be upgraded to a higher category.

Under Canadian rules, estimated "inferred mineral resources” may not form the basis of

feasibility or pre-feasibility studies except in rare cases. Investors are cautioned not to assume

that all or any part of an "inferred mineral resource” exists or is economically or legally mineable.

Disclosure of "contained ounces” in a resource is permitted disclosure under Canadian

regulations; however, the SEC normally only permits issuers to report mineralization that does

not constitute "reserves” by SEC standards as in-place tonnage and grade without reference to

unit measures. The requirements of NI 43- 101 for identification of "reserves” are also not the

same as those of the SEC, and reserves reported by the Company in compliance with NI 43-

101 may not qualify as "reserves” under SEC standards. Accordingly, information concerning

mineral deposits set forth herein may not be comparable with informa tion made public by

companies that report in accordance with U.S. standards.