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B2GOLD and Calibre Mining Join Forces IN Nicaragua Calibre Mining to Acquire El Limon and LA Libertad GOLD Mines B2GOLD to Become Calibre’S Largest Shareholder Calibre Announces Concurrent CDN$100 Million Equity Financing

Financings Mergers & Acquisitions Partnerships & JV

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NEWS RELEASE

B2GOLD AND CALIBRE MINING JOIN FORCES IN NICARAGUA

CALIBRE MINING TO ACQUIRE EL LIMON AND LA LIBERTAD GOLD MINES

B2GOLD TO BECOME CALIBRE’S LARGEST SHAREHOLDER

CALIBRE ANNOUNCES CONCURRENT CDN$100 MILLION EQUITY FINANCING

Not for distribution to United States newswire services or for dissemination in the United States

July 2, 2019

Vancouver, British Columbia : B2Gold Corp. (TSX.BTO . NYSE AMERICAN: BTG. NSX:

B2G) ( “B2Gold”) and Calibre Mining Corp. (TSX -V: CXB) (the “Company” or “Calibre”)

(jointly the “Partners”) are pleased to announce that on July 2, 2019, the Partners entered into a

binding agreement (the “Agreement”) for B2Gold to restructure its interests in , and for Calibre

to acquire, the producing El Limon and La Libertad Gold Mines (the “Nicaragua Mines”), the

Pavon Gold Project and additional mineral concessions in Nicaragua (collectively, the

“Nicaragua Assets”) held by B2Gold for aggregate consideration of US $100 million (the

“Purchase Price ”), which Purchase Price will be paid with a combination of cash, common

shares and a convertible debenture (the “Transaction”). Following the completion of the

Transaction, B2Gold will own an approximat e 31% direct equity interest in Calibre . B2Gold’s

ongoing commitment to continuing involvement with the Nicaraguan operations will be secured

by its significant equity interest in Calibre, its right to appoint one director to the Board of

Calibre and its participation in an Advisory Board to the main Board of Calibre

The El Limon and La Libertad Mines have produced in excess of 1.4 million ounces of gold

since 2010. Their combined 2019 gold production is projected to be between 150,000 and

160,000 ounces (see: B2Gold MD&A for period ended March 31, 2019 filed on B2Gold’s profile

on SEDAR).

In connection with the Transaction, Calibre has entered into an agreement with Canaccord

Genuity Corp. and Sprott Capital Partners LP (together, the “Lead Agents ”) in re spect of a

private placement of up to 1 67,000,000 subscription receipts (the “Subscription Receipts”) for

gross proceeds of up to CDN$100 million (the “Concurrent Private Placement”).

The c losing of the Transaction will be subject to certain conditions i ncluding majority of

minority shareholder approval, the successful negotiation and execution of a definitive

agreement (the “Definitive Agreement”) by B2Gold and Calibre, the closing of the Concurrent

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Private Placement by Calibre and satisfactory due dilig ence by Calibre. In connection with the

closing of the Transaction, Calibre intends to apply to graduate to the Toronto Stock Exchange

(subject to Toronto Stock Exchange approval and meeting the initial listing requirements of the

Toronto Stock Exchange).

Clive Johnson, President and Chief Executive Officer of B2Gold stated: “We are pleased to join

forces with Calibre in Nicaragua to continue our legacy of 10 years of responsible exploration,

development and gold production . We are pleased to be come a large shareholder of Calibre and

through our roles on their Advisor y Board and Board of Directors, we look forward to assisting

Calibre’s experienced executive team and the combined B2Gold /Calibre management team in

Nicaragua.

With Calibre and the combined Nicaraguan management team focussing on the El Limon and La

Libertad Mines and other opportunities, B2Gold will focus on continuing to optimize responsible

production at our other existing mines in Mali, Namibia and the Philippines as well as advancing

our impressive pipeline of development and exploration projects. In addition, B2Gold will

continue to pursue additional greenfield and advanced exploration opportunities.”

B2Gold’s History and Continuing Legacy of Success in Nicaragua

B2Gold was created in 2007 by the previous management of Bema Gold Corp. In 2009 , B2Gold

acquired the El Limon and La Libertad Mines in Nicaragua. B2Gold significantly improved the

operations and economics of the El Limon Mine and , in addition, constructed a mill facility and

commenced profitable gold production at the La Libertad Mine and realized significant

exploration success around both mines. Over the last 10 years the Nicaragua Mines have

produced in excess of 1.4 million ounces of gold, with B2Gold investing more than $56 0 million

in capital and exploration in Nicaragua over that period.

Since 2010, the La Libertad and El Limon Mines have been an important contributor to the local

and national economies, responsible for a large percentage of the country’s gold exports. Gold

now ranks third in the country’s main exports.

In addition to being Nicaragua’s largest exporters of gold, the La Libertad and El Limon Mines

are collectively also the largest individual exporting operations in the country.

B2Gold Nicaragua is a major employer in Nicaragua with La Libertad and El Limon mines

generating over 2,800 direct and contract jobs. Approximately 90% of B2Gold Nicaragua’s

direct employees are from the local communities around La Libertad and El Limon mines and

fewer than 1% of direct employees are expatriates.

Russell Ball, Executive Chairman of Calibre stated : “We are delighted to be able to partner with

B2Gold on the acquisition of the El Limon and La Libertad Mines and welcome B2Gold as a

significant shareholder of Calibre. We see continuing the ongoing commitment to the current

management team and many long -term employees as fundamental to the future success of our

company and are grateful to have B2Gold’s unwaverin g guidance and involvement in carrying

out this responsibility.

Calibre has been actively exploring in Nicaragua for the past ten years and has enjoyed excellent

support from our employees, suppliers and the Nicaraguan government . Calibre is fully

committed to maintaining B2Gold’s high standards of responsible mining, government relations,

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health, safety and environment and corpora te social responsibility that B2Gold established at its

Nicaraguan operations in partnership with its management team, employees and contractors.

Maintaining these high standards is an essential benefit for all stakeholders.”

Transaction Highlights

B2Gold has disclosed 2019 consolidated production guidance for the Nicaragua Mines of

150,000 to 160,000 ounces of gold ( see: B2Gold MD&A for period ended March 31, 2019 filed

on B2Gold ’s profile on SEDAR ). The Nicaragua Mines also contain exploration potential,

particularly at El Limon , where B2Gold recently discovered the high -grade El Limon Central

Gold Zone, which hosts a high -grade open-pit inferred mineral resource of 5.1 Mt grading 4.92

g/t gold conta ining approximately 812,000 oz of gold ( see: B2Gold News Release dated

February 23, 2018 filed on B2Gold’s profile on SEDAR).

Other potential benefits of the Transaction for Calibre include:

• Immediate gold production and cash flow : The acquisition est ablishes Calibre as a

gold producer with exceptional exploration potential in a jurisdiction that Calib re and

B2Gold have been successfully operating in for over 10 years.

• Near-term growth potential : There is p otential for near-term low capital e xpansion at

El Limon in order to reduce costs , increase production to 75,000 ounces of gold per year

for an initial 10 years and extend the mine life by an additional 11 years with the

inclusion of historical tailings re -treatment. Once expanded, El Limon is estimated to

generate over US$235M of after -tax free cash flow (using US$1,300/oz gold price) (see

B2Gold News Release dated October 22, 2018 filed on B2Gold’s profile on SEDAR).

• Substantial increase in Calibre’s resource base : The acquisition will a dd measured

and indicated resources of 1, 135,000 ounces of gold (for details of resource category,

tonnages and grade see Tables 1 and 2 below) and inferred resources of 1,473,000 ounces

of gold (for details of tonnages and grade se e Tables 1 and 2 below) to Calibre’s current

inferred resources of 2,400,000 gold -equivalent ounces (see: Iamgold Corporation and

Calibre Mining Corp. Technical Report on the Eastern Borosi Project, Nicaragua dated

May 11, 2018, Primavera Project Resource Estimate dated January 31, 2017, Calibre

Mining NI 43 -101 Technical Report and Resource Estimation on the Cerro Aeropu erto

and La Luna Deposits, Borosi Concessions, Nicaragua dated April 11, 2011 filed on

Calibre’s profile on SEDAR) (see: Table 1 below).

• Proven management team and board: The new management team and board of

directors have extensive experience in the mining industry with a long history of

substantial s takeholder value creation and proven capabilities in financing, acquiring,

discovering, developing and operating open-pit and underground mines.

• Compelling value proposition : Calibre will be well -positioned with leading leverage

among junior gold producer equities with significant exploration potential and an

attractive valuation on net asset value, cash flow, resource, and production multiples.

• Establishes a Strategic Partnership wi th B2Gold: Following the restructuring of

B2Gold’s investment in its Nicaraguan operations, B2Gold will own a direct approximate

31% equity interest in Calibre. B2Gold’s ongoing commitment to continuing

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involvement with the Nicaraguan operations will be secured by its significant equity

interest in Calibre, its right to appoint one director to the Board of Calibre and its

participation in an Advisory Board to the main Board of Calibre. B2Gold’s exceptional

track record and expertise in finding, acquiring , building and operating mines will be of

significant benefit to Calibre as Calibre seeks to expand its gold production and resource

base.

• Execution of a gold consolidation strategy: The acquisition establishes a producing

platform to continue to acquire quality gold production assets and development

opportunities. Shareholders will be well -positioned to participate in future value creation

and growth opportunities.

Cautionary Statement

The reader is advised that the El Limon Central results summarized in this news release are

intended to provide only an initial, high -level review of the project potential and expansion

options. The initial mine plans and economic models include numer ous assumptions and the use

of Inferred Mineral Resources. The El Limon Central expansion study is preliminary in nature,

and it includes Inferred Mineral Resources that are considered too speculative geologically to

have the economic considerations applie d to them that would enable them to be categorized as

Mineral Reserves. There is no guarantee that Inferred Mineral Resources can be converted to

Indicated or Measured Mineral Resources and, consequently, there is no guarantee the

production estimates or project economics described herein will be achieved.

Management Team and Board of Directors

In connection with the Transaction, Calibre intends to make amendments and supplements to its

management team and board of directors . Calibre anticipates it will benefit from the proven and

experienced board and executive management team , focused on stakeholder value creation . The

management team of Calibre is expected to include:

• Russell Ball: Chief Executive Officer

• Darren Hall: SVP and Chief Operating Officer

• John Seaberg: SVP and Chief Financial Officer

• Greg Smith: VP Exploration

• Ryan King: VP Corporate Development & IR

The Calibre management team will be supported by an experienced Board of Directors including

the former Newmarket Gold founders Blayne Johnson, Douglas Forster, Raymond Threlkeld,

Doug Hurst and Ed ward Farrauto, and a B2Gold nominee . Blayne Johnson will act as Non -

Executive Chairman upon closing of the Transaction and an Advisory B oard will be established

that includes two representatives each from B2Gold and Calibre.

The relevant experience of the proposed Calibre management team is included in Appendix A.

El Limon

B2Gold owns a 100% interest in El Limon , which is an open pit and underground gold mine

located approximately 100 km northwest of Managua, the capital of Nicaragua. A major new

high-grade gold discovery at El Limon was announced by B2Gold in February 2018 at Limon

Central where open -pit mining h as commenced with an initial Inferred Resource of 5.1Mt

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grading 4.92 g/t Au containing 812,000 ounces of gold. With the deposit open along strike and

at depth, significant exploration potential remains across the property.

In 2018, El Limon processed 447,961 tonnes grading 3.64 g/t gold with a recovery rate of 94.9%

and produced 49,629 ounces.

In 2019, B2Gold ’s production guidance for El Limon is 55,000 to 60,000 ounces with cash

operating cost guidance of between US$720 and US$760 per ounce and All -In Sustaining Costs

(AISC) guidance of US$1,005 to US$1,045 per ounce, with the second half anticipated to benefit

from increased production and lower costs.

La Libertad

B2Gold owns a 100% interest in La Libertad , which is an open pit and underground gold mine

located in the La Libertad -Santo Domingo Region of the Department of Chontales in Central

Nicaragua, approximately 110 km east of Managua. The annual mill throughput is

approximately 2,250,000 tonnes and current gold recoveries are approximately 94% to 95%.

In 2018, La Libertad mine processed 2,250,687 tonnes grading 1.19 g/t gold with a recovery rate

of 94.4% and produced 80,963 ounces of gold.

Most recently, and significantly, the environmental permit for the Jabali Antena Open Pit was

received in June 2019, and as of June 28, 2019, all resettlement, artisanal miner and land

possession issues have been resolved and development of the Jabali Antena Open Pit has

commenced.

B2Gold’s 2019 guidance for La Libertad is 95,000 to 100,000 ounces at cash operating costs of

between US$840 and US$880 per ounce and AISC of US$1,150 to US$1,190 per ounce. The La

Libertad project including the surrounding exploration concessions has numerous excellent

exploration targets that can expand the current resource base on the 155.37 km2 property.

Table 1: El Limon and La Libertad Reserve and Resource Estimates

Description

Tonnes

Gold Grade

(g/t)

Contained Gold

Ounces

La Libertad – Probable 1,100,000 2.01 70,000

El Limon – Probable 600,000 3.97 70,000

Total Probable Mineral Reserves 140,000

La Libertad – Indicated 2,000,000 2.61 170,000

El Limon – Indicated 11,700,000 2.40 910,000

Total Indicated Mineral Resources 1,080,000

La Libertad – Inferred 3,200,000 4.37 450,000

El Limon – Inferred 5,600,000 5.53 1,000,000

Total Inferred Resources 1,450,000

The information concerning El Limon and La Libertad is derived from for period ended March 31, 2019 and filed

on B2Gold’s SEDAR profile on May 7, 2019 , MD&A for the period ended March 31, 2018 and filed on B2Gold’s

SEDAR profile on May 9, 2018, B2Gold’s press release dated February 23, 2018, and t echnical report entitled NI

43-101 Technical Rep ort, La Libertad Mine, La Libertad Region, Nicaragua dated March 27, 2015 and filed on

B2Gold’s SEDAR profile on March 30, 2015. To the best knowledge, information and belief of Calibre, there is no

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new material scientific or technical information that wou ld make the disclosure of the mineral resource or reserves

inaccurate or misleading. Mineral Resources are not mineral reserves and do not have demonstrated economic

viability.

Pavon Gold Project

B2Gold owns 100% of the Pavon Gold Project, which is located approximately 150 km north of

La Libertad. Gold mineralization is characterized as a low -sulphidation, quartz epithermal vein

system. Gold mineralization is hosted in quartz vein and quartz vein breccia units with locally

high grade in stockwork zones. Gold Mineralization is currently hosted in two zones , El Pavon

Norte and El Pavon Central. Calibre believes that there remains significant exploration potential

at the Pavon Gold Project.

Table 2: Pavon Gold Resource Estimate

Description

Tonnes Gold Grade

(g/t)

Contained Gold

Ounces

Indicated Resources 290,000 5.82 55,000

Inferred Resources 130,000 5.50 23,000

All technical information related to the Pavon Gold Project is based on the B2Gold Annual Information Form dated

March 27, 2015, a copy of which is available under B2Gold’s profile on SEDAR.

Calibre’s Borosi Gold Project

Calibre has been operating in Nicaragua for 10 years and owns a 100% interest in o ver 518 km 2

of mineral concessions in the Borosi Gold Project in the Mining Triangle of Northeast Nicaragua

including the Primavera Gold-Copper Project. Calibre also has a Joint Venture with IAMGOLD

(currently Calibre 49%: IAMGOLD 51%) on the 176 km2 Eastern Borosi Gold Project where the

Joint Venture has outlined an inferred gold resource of 4.42Mt grading 5.72 g/t AuEq containing

812,000 oz AuEq (see: Calibre News Release, dated April 3, 2018 and filed on Calibre’s profile

on SEDAR ). Including Cali bre’s 49% interest in the IAMGOLD JV, Calibre ’s inferred

resources on the Borosi Gold Project total 2.44 mil lion oz AuEq in four deposits (see: Iamgold

Corporation and Calibre Mining Corp. Technical Report on the Eastern Borosi Project,

Nicaragua dated May 11, 2018, Primavera Project Resource Estimate dated January 31, 2017,

Calibre Mining NI 43 -101 Technical Report and Resource Estimation on the Cerro Aeropuerto

and La Luna Deposits, Borosi Concessions, Nicaragua dated April 11, 2011 filed on Calibre’s

profile on SEDAR).

Transaction Summary

Under the terms of the Transaction, Calibre is expected to acquire all of the outstanding

intercompany loans and shares of or amalgamate with, as the case may be, the following B2Gold

subsidiaries: Triton Minera S.A.; Desarrollo Minero de Nicaragua S.A. ( which in turn owns

100% of Cerro Quiros Gold S.A. ); Minera Glencairn S.A., and Minesa (Cayman) Inc. (which in

turn owns 100% of Minerales Nueva Esparanza S.A. ) (together, the “Nicaragua Subsidiaries”)

for aggregate consideration of US$100 million on a cash -free, debt -free basis. The Nicaragua

Subsidiaries are the registered and beneficial owners of the Nicaragua Assets.

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The Purchase Price under the Transaction will be payable as follows:

• On closing of the Transaction : US$40 million in cash; US$40 million in common shares

of Calibre (“Calibre Shares”) priced at CDN$0.60 per Calibre Share (such shares being

the “Upfront Consideration Shares”), provided that if the Concurrent Private Placement

or any other financing completed by Calibre concurrently with or prior to closing raises

funds at an offering p rice of less than CDN$0.60 per Subscri ption R eceipt or Calibre

Share, then such Upfront Consideration Shares to be issued to B2Gold shall be at such

lower price); and (iii); and a US$10 million convertible debenture (t he “Debenture”);

and

• 12 months from the closing of the Transaction: US$10 million in cash.

The principal amount owing under the Debenture will bear interest at 2% and will be payable in

cash on that date which is two years from closing of the Transaction (the “Maturity Date ”)

provided that (i) at any time pri or to the close of business on the last business day immediately

preceding the Maturity Date, the Debenture will be convertible at the option of B2Gold at a

conversion price equal to a price that is 25% above the price of the Upfront Consideration Shares

to be issued to B2Gold; and (ii) in the event that prior to the Maturity Date the volume weighted

average price of the C alibre Shares is equal to or greater than a 35% premium to the price per

share of the Concurrent Private Placement for 10 consecutive trading days on a recognized North

American stock exchange on which the majority of Calibre’s trading occurs, Calibre can force

conversion of the Debenture. The Debenture will be a direct, unsecured obligation of Calibre,

ranking equally with all other existing and future unsecured indebtedness of Calibre and will be a

non-voting security.

Shareholder Approval and Other Conditions of Closing

At present, B2Gold holds approximately 11.9% of the issued and outstanding Calibre Shares and

as such is considere d a “related party ” of Calibre under Multilateral Instrument 61 -101 –

Protection of Minority Security Holders in Special Transactions (“MI 61 -101”). Upon the

completion of the Transaction, B2Gold will hold approximately 31% of the issued and

outstanding Calibre Shares and assuming the conversion of the Convertible Debenture, will hold

approximately 35% of the issued and outstanding Calibre Shares. As such, the Transaction will

result in the creation of a “control person” of Calibre for the purposes of applicable securities

laws and will be considered a “Non-Arms Length Reverse Takeover ” of Calibre under TSX

Venture Exchange ( “TSXV”) Policy 5.2 – Changes of Business and Reverse Takeovers.

Accordingly, for Calibre, the Transaction will require the approval of a majority of the minority

of the votes cast on the resolution by Calibre shareholders present in person or represented by

proxy at the Calibre shareholder meeting.

Calibre will be exempt from the formal valuation requirement in section 5.4 of MI 61 -101 in

reliance on sections 5.5(b) of MI 61 -101 as no securities of the Company are listed or quoted for

trading on prescribed stock exchanges or stock markets.

In addition to shareholder approval, the Transaction is subject to satisfactory due diligence,

applicable regulatory approvals, the execution of a definitive agreement and the satisfaction of

other closing conditions customary in transactions of this nature, including the approval of the

TSXV. It is anticipated that the shareholder meeting will be held in September 2019.

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Investor Rights Agreement

Concurrently with the closing of the Transaction, Calibre and B2Gold will enter into an investor

rights agreement which will provide, among other things, that for so long as B2Gold holds at

least 10% of the issued and outstanding Calibre Shares, it will have pro rata participation rights

and piggyback registration rights. Further, until such time as B2Gold no longer holds 10% or

more of the issued and outstanding Calibre Shares , B2Gold must give Calibre prior written

notice of its intention to sell more tha n 1% of the then issued and outstanding Calibre Shares in

any 30-day period. Upon receipt of such notice, Calibre will have five business days to designate

the purchase of all or any portion of such shares, failing which, B2Gold will have the right to sell

any remaining shares for an additional 30 days. Additionally, for so long as B2Gold holds at

least 5% of the issued and outstanding Calibre shares, it will have the right to nominate one

director to the Calibre board of directors.

In connection with the closing and implementation of the Transaction, an Advisory Board will be

established and be comprised of two representatives from B2Gold and two representatives from

Calibre.

Private Placement Subscription Receipt Financing

In connection with the Transaction, the Lead Agents have entered into an agreement with Calibre

to complete a private placement , on a best efforts basis, of up to 1 67,000,000 Subscription

Receipts for gross proceeds of up to CDN$100 million. Each Subscription Receipts will be

issued at a price per Subscription Receipt of CDN$0.60 (the “Offering Price”).

In addition, Calibre has granted the Lead Agents an option (the “ Agent’s Option”) to increase

the size of the Of fering by up to an additional C DN$15 million of Subscription Receipts, at the

Offering Price. The Agent ’s Option shall be exercisable at any time up to 48 hours prior to the

closing of the Concurrent Private Placement.

It is anticipated that pursuant to the terms of a subscription receipt agreement (the “Subscription

Receipt Agreement ”) to be entered into among the Lead Agents, Calibre and a licensed

Canadian trust company or other escrow agent mutually acceptable to the Lead Agents and

Calibre (the “Escrow Agent”), the gross proceeds from the Concurrent Private Placement will be

delivered to and held by the Escrow Agent until such time as the release conditions set out in the

Subscription Receipt Agreement (the “Release Conditions ”) have been met. The Release

Conditions will include the completion, satisfaction or waiver of all conditions precedent to the

completion of the Transaction.

Upon the satisfaction of the Release Conditions, each Subscription Receipt will be automatically

converted, with out payment of any additional consideration into one Calibre Share. Of the

proceeds from the Concurrent Private Placement, US$40 million will be used to satisfy the cash

component of the Purchase Price payable on closing and the remaining proceeds of up to US$36

million will be used for mine operations , exploration, working capital, and general corporate

purposes.

If the Release Conditions are not satisfied on or before November 15, 2019, or prior to such date,

Calibre advises the Lead Agents or announces to the public that it does not intend to satisfy the

Release Conditions, the Subscription Receipt holders will be entitled to a return of the aggregate