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Corporate Presentation April 2019 Cautionary Notes Cautionary Note on Forward Looking Information Compliance with NI 43-101 This presentation, and the documents incorporated by reference herein, may contain forward-looking information


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SLIDE 1

Corporate Presentation

April 2019

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SLIDE 2

Cautionary Notes

Cautionary Note on Forward Looking Information

This presentation, and the documents incorporated by reference herein, may contain “forward-looking information” within the meaning of Canadian securities legislation and “forward-looking statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995 (collectively, “forward-looking statements”). These forward-looking statements are made as of the date of this document and Capstone Mining Corp. (“Capstone” or the “Company”) does not intend, and does not assume any obligation, to update these forward-looking statements, except as required under applicable securities legislation. Forward-looking statements relate to future events or future performance and reflect our expectations or beliefs regarding future events. Forward-looking statements include, but are not limited to, statements with respect to the estimation of mineral resources and mineral reserves, the realization of mineral reserve estimates, the timing and amount of estimated future production, costs of production and capital expenditures, the success of our mining operations, environmental risks, unanticipated reclamation expenses and title disputes. In certain cases, forward-looking statements can be identified by the use of words such as “plans”, “expects”, “guidance”, “scheduled”, “estimates”, “forecasts”, “intends”, “anticipates”, “believes” or variations of such words and phrases, or statements that certain actions, events or results “may”, “could”, “would”, “might” or “will be taken”, “occur” or “be achieved” or the negative of these terms or comparable

  • terminology. In this document certain forward-looking statements are identified by words such as “targeting”,

“guidance”, “potential”, “extended”, “convert”, “will”, “plan” and “expected”. By their very nature, forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such factors include, amongst others, risks related to inherent hazards associated with mining operations and closure of mining projects, future prices of copper and other metals, compliance with financial covenants, surety bonding, our ability to raise capital, Capstone’s ability to acquire properties for growth, counterparty risks associated with sales of our metals, foreign currency exchange rate fluctuations, changes in general economic conditions, accuracy of mineral resource and mineral reserve estimates,

  • perating in foreign jurisdictions with risk of changes to governmental regulation, compliance with governmental

regulations, compliance with environmental laws and regulations, reliance on approvals, licences and permits from governmental authorities, impact of climatic conditions on our operations, aboriginal title claims and rights to consultation and accommodation, land reclamation and mine closure obligations, uncertainties and risks related to the potential development of the Santo Domingo Project, increased operating and capital costs, challenges to title to

  • ur mineral properties, maintaining ongoing social license to operate, dependence on key management personnel,

potential conflicts of interest involving our directors and officers, corruption and bribery, limitations inherent in our insurance coverage, labour relations, increasing energy prices, competition in the mining industry, risks associated with joint venture partners, our ability to integrate new acquisitions into our operations, cybersecurity threats, legal proceedings, and other risks of the mining industry as well as those factors detailed from time to time in the Company’s interim and annual financial statements and MD&A of those statements, all of which are filed and available for review under the Company’s profile on SEDAR at www.sedar.com. Although the Company has attempted to identify important factors that could cause our actual results, performance or achievements to differ materially from those described in our forward-looking statements, there may be other factors that cause our results, performance or achievements not to be as anticipated, estimated or intended. There can be no assurance that our forward-looking statements will prove to be accurate, as our actual results, performance or achievements could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on our forward-looking statements.

Compliance with NI 43-101

Unless otherwise indicated, Capstone has prepared the technical information in this presentation (“Technical Information”) based on information contained in the technical reports and news releases (collectively the “Disclosure Documents”) available under Capstone Mining Corp.’s company profile on SEDAR at www.sedar.com. Each Disclosure Document was prepared by or under the supervision of a qualified person (a “Qualified Person” or “QP”) as defined in National Instrument 43-101 – Standards of Disclosure for Mineral Projects of the Canadian Securities Administrators (“NI 43-101”). For readers to fully understand the information in this presentation, they should read the Technical Reports (available on www.sedar.com) in their entirety, including all qualifications, assumptions and exclusions that relate to the information set out in this presentation which qualifies the Technical Information. Readers are advised that mineral resources that are not mineral reserves do not have demonstrated economic viability. The Disclosure Documents are each intended to be read as a whole, and sections should not be read or relied upon out of

  • context. The Technical Information is subject to the assumptions and qualifications contained in the Disclosure

Documents.

Alternative Performance Measures

“C1 cash cost”, “cash cost”, “adjusted EBITDA”, “operating cash flow before changes in working capital” and “net debt” are Alternative Performance Measures. Alternative performance measures are furnished to provide additional

  • information. These non-GAAP performance measures are included in this presentation because these statistics are

key performance measures that management uses to monitor performance, to assess how the Company is performing, to plan and to assess the overall effectiveness and efficiency of mining operations. These performance measures do not have a standard meaning within IFRS and, therefore, amounts presented may not be comparable to similar data presented by other mining companies. These performance measures should not be considered in isolation as a substitute for measures of performance in accordance with IFRS. For full information, please refer to the Company’s latest Management Discussion and Analysis published on its Financial Reporting webpage or on SEDAR.

Currency

All amounts are in US$ unless otherwise specified.

Footnotes

See Slide Notes for all footnotes throughout the presentation

CAPSTONE MINING (TSX:CS) • 2

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SLIDE 3

Capstone Mining

Pinto Valley

Flagship mine in Arizona, USA

  • Continuous optimization; focused
  • n lowering costs
  • Long Reserve life1
  • Potential upside of untapped

Resources 1

Cozamin

Recession-proof mine in Mexico

  • Low cost mine
  • Mine life extended to 2024, with

significant Resources to convert2

  • Targeting 30% increase in

production by end of 20202

CAPSTONE MINING (TSX:CS) • 3

Santo Domingo

Path forward in Chile

  • Strong economics3 (after-tax):

NPV $1.0 billion, IRR 22%, payback 2.8 years

  • Launched strategic process to
  • ptimize ownership structure to

align with financing capabilities

Low Risk Copper Producer • Focused on Execution • Delivering Value

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SLIDE 4

32.7 Mlbs

Pinto Valley Cu production

$1.79

Pinto Valley C1 cash cost1 per pound payable produced

$108.9 M

Revenue from continuing operations2

8.7 Mlbs

Cozamin Cu production

$0.70

Cozamin C1 cash cost1 per pound payable produced

$41.8 M

Adjusted EBITDA1 from continuing operations

41.4 Mlbs

Total copper production from continuing operations

$1.56

Consolidated C1 cash cost1 per pound payable produced

$30.7 M

Operating cash flow before changes in working capital1,2

Q1 2019 Results*

Continuing to demonstrate quarter-on-quarter performance improvement

*Refer to the Company’s Financial Statements and Management’s Discussion and Analysis for the three months ended March 31, 2019 for full details.

CAPSTONE MINING (TSX:CS) • 4

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SLIDE 5

34.6 37.4 41.0 42.3 41.4 $1.95 $1.84 $1.85 $1.70 $1.56

$0.00 $0.20 $0.40 $0.60 $0.80 $1.00 $1.20 $1.40 $1.60 $1.80 $2.00 10 20 30 40 50

Q1 2018 Q2 2018 Q3 2018 Q4 2018 Q1 2019 C1 Cash Cost1 ($US) Cu Production (million pounds)

Capstone Mining 2018-2019 Quarterly Production and C1 Cash Cost1

Pinto Valley Cozamin Total Consolidated Production C1 Cash Cost

Delivering Production Results

Continuing to drive costs lower after achieving operational stability

CAPSTONE MINING (TSX:CS) • 5

1

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SLIDE 6

2019 Production and Capital Expenditure Guidance

Catalysts and Key Drivers1

Pinto Valley

  • Scoping level study examining the potential

economics of overall R&R base

  • Quarterly copper grade profile will

fluctuate, with annual average of 0.32% Cozamin

  • Eliminate production bottleneck, increasing

throughput by 30% to approximately 3,800 tonnes per day by end of 2020 with an estimated investment of less than $5 million

  • Brownfield exploration to assess up dip

areas of northwest Mala Noche Footwall Zone where open Santo Domingo

  • Complete strategic process to evaluate

alternatives relating to ownership of project

  • Conduct preliminary economic assessment

for producing cobalt as a by-product

  • Continue to advance project to be

construction ready by early 2020

Guidance for Continuing Operations1

Pinto Valley Cozamin Santo Domingo Total Production and Cost Copper production (million lbs.) 115 – 125 30 – 35

  • 145 - 160

C1 Cash Cost2 (US$) $2.10 - $2.25 $0.90 - $1.05

  • $1.80 - $2.00

Capital Expenditure and Exploration (US$ millions) Total Capital Expenditure 46.0 33.0 10.5. 89.5 Total Exploration

  • 6.0
  • 12.0

CAPSTONE MINING (TSX:CS) • 6

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SLIDE 7

Pinto Valley

  • PV3 mine plan doubled mine life to 2039
  • Total Reserve Estimate1 of 408 million tonnes grading

at 0.31% copper

  • Long-term organic growth potential
  • Measured and Indicated Resource Estimate1

(inclusive of Reserves) of over 1.33 billion tonnes grading 0.30% copper

  • 2019 catalyst
  • Scoping level study examining the potential

economics of overall Reserve and Resource base2

  • Quarterly copper grade profile will fluctuate, with

annual average of 0.32%. Grade for Q2 is expected to be ~0.28%, the lowest quarter of the year.

CAPSTONE MINING (TSX:CS) • 7

Potential upside of untapped Resources

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SLIDE 8

Cozamin

  • Increased copper resource provides an opportunity to utilize surplus mill capacity
  • Targeting production of between 40 to 45 million pounds of copper by the end of 2020; result of transforming the

underground haulage network into a one-way ramp loop to debottleneck the mine1

  • Capital budget of $6 million in 20192 for brownfield exploration to assess up dip areas of northwest Mala Noche

Footwall Zone

CAPSTONE MINING (TSX:CS) • 8

259 kt

MNFWZ

San Rafael Zinc Zone San Rafael Shaft

Zinc Potential Open Cu-Zn Potential MNV

San Roberto Shaft

Looking North-Northeast

Zaragoza Shaft

1 km 1600 2000 2400 MASL

One-way ramp

One-way ramp

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SLIDE 9

Cities and Towns Mines Operating Ports Projected Ports

El Salvador Mine Caldera Copiapo Candelaria Tierra Amarilla Chañaral Diego de Almagro CNN Mine Manto Verde

Santo Domingo

Barquito Port Atacama Port Punta Caldera Port Punto Padrones

CHILE

Pipeline

Santo Domingo Port

Punto Totoralillo

Santo Domingo Project

 Strategic process to optimize ownership structure  Permitted; ready for construction in early 2020  Additional NAV levers:

 Cobalt and improved gold recovery potential upsides  Infrastructure sharing options being evaluated  Potential to utilize autonomous equipment

2018 Technical Report Key Highlights1

Mine Life 17.9 years Throughput (tpd) 60,000 nominal average

Average Annual Production

First 5 Years LOM Copper 259M lbs. 134M lbs. Iron Concentrate 3.3M tonnes 4.2M tonnes Gold 34,700 oz. 17,000 oz. C1 Cash Cost2 per lb. Cu $0.47 $0.02

Economics3 (US$)

Project Capstone (70%) Initial Construction Capital $1.51B $1.06B NPV (after-tax, 8%) $1.03B $0.72B IRR (after-tax) 21.8% Payback period (after-tax) 2.8 years

CAPSTONE MINING (TSX:CS) • 9

High-quality project at the right time

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SLIDE 10

Solid Balance Sheet

0.3 0.4 0.5 1.1 2.5 2.8 8.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Trevali Hudbay Ero Copper Capstone Taseko Copper Mountain Turquoise Hill US$ millions

2019E Net Debt1/EBITDA1,5

$- $0.02 $0.04 $0.06 $0.08 $0.10 $0.12 $- $10 $20 $30 $40 $50 Q1 2017 Q2 2017 Q3 2017 Q4 2017 Q1 2018 Q2 2018 Q3 2018 Q4 2018 Q1 2019

Adjusted EBITDA1 Trend4

Adjusted EBITDA (US$ millions) Adjusted EBITDA/Share (US$)

CAPSTONE MINING (TSX:CS) • 10

Capstone’s low net debt/EBITDA ratio combined with its balance sheet provides financial leverage

1.12:1

Net debt1/EBITDA1 as at Mar 31/19

US$73 Million

Cash and cash equivalents2 as at Mar 31/19

US$109 Million

Total cash repayments to long-term debt since Jan 1/173

US$139 Million

Rolling 12-month adjusted EBITDA1 to Mar 31/19

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SLIDE 11

$- $0.50 $1.00 $1.50 $2.00 $2.50 50 100 150 200 Capstone Taseko Atalaya Imperial Metals Copper Mountain Cash Cost/lbs. Cu Produced (US$) Million lbs. Cu Produced

FY2018 Attributable Production2

Copper Production (million lbs.) Cash Cost/lbs Cu ($US)

Peer Value Comparison

CAPSTONE MINING (TSX:CS) • 11

Capstone provides unparalleled copper exposure at an extremely low valuation

0.2 0.4 0.6 0.8 1 1.2 1.4 Capstone Turquoise Hill Copper Mountain Taseko Hudbay Lundin Ero Copper Trevali

P/NAV3

  • 5

10 15 20 25 Capstone Taseko Lundin Hudbay Oz Minerals Copper Mountain Ero Copper Imperial Metals Turquoise Hill

EV/EBITDA 2019E4

$- $2 $4 $6 $8 $10 $12 $14 $16 $18 Capstone Taseko Atalaya Copper Mountain Imperial Metals Hudbay Oz Minerals Lundin Ero Copper Turquoise Hill

EV/2019 Attributable Production Guidance

($/lb Cu)1

Q1-19

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SLIDE 12

Copper Fundamentals

CAPSTONE MINING (TSX:CS) • 12

Long-term, copper is headed for structural deficit; demand growth driven by macro concerns, global development and electric vehicle demand growth

NBF Estimates Potential for Large Deficits1

Source: NBF estimates, Wood Makenzie

“In short, copper and base metals are trading on fears rather than fundamentals.”

  • The Quantitative Strategist – Outlook 2019 Report, January 11, 2019

by Canaccord Genuity Capital Markets Building Construction Equipment Infrastructure Transportation

Total Cu Demand by End Use Sector2

Source: Bloomberg consensus as at January 2, 2019

Asia Americas Europe ROW

Total Cu Demand by Region2

Source: Bloomberg consensus as at January 2, 2019

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SLIDE 13

Positioned for the Long-Term

Low Risk Copper Producer

  • Focused on Execution
  • Delivering Value

Existing Operations Continuing to Deliver

  • Four consecutive quarters of improving results
  • Q1 2019 C1 cash costs1 of $1.56/lb, down 20% year-over-year
  • Identifying further optimizations and cost reductions
  • Unparalleled low-risk exposure to rising copper prices

High Quality Growth Exists Within Current Portfolio

  • Cozamin on-track for 30% production increase by end of 2020
  • Pinto Valley scoping study to examine ultimate Resource

potential

  • Santo Domingo permitted project with value-maximizing process

underway

CAPSTONE MINING (TSX:CS) • 13

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SLIDE 14

Slide Notes

Capstone Mining 1. See Appendix for Pinto Valley’s Mineral Reserve and Resource Estimate as at December 31, 2018, or refer to the Company’s Annual Information Form for the year ended December 31, 2018 for full details. 2. Refer to the Company’s news release of January 24, 2019 and January 2019 NI43-101 Report for full details. 3. Refer to the Company’s news release dated November 26, 2018 for full details. Q1 2019 Results 1. This is an Alternative Performance Measure; refer to the Company’s Management’s Discussion and Analysis for the three months ended March 31, 2019 for full details. 2. In accordance with IFRS 5, Minto’s results are excluded from revenue but included within cash flow amounts. Delivering Production Results 1. This is an Alternative Performance Measure; refer to the Company’s Management’s Discussion and Analysis for the year ended December 31, 2018 and for the three months ended March 31, 2019 for full details. 2019 Production and Capital Expenditure Guidance 1. Refer to the Company’s news release dated January 10, 2019 for full details. 2. This is an Alternative Performance Measure; refer to the Company’s news release dated January 10, 2019 for full details. Pinto Valley 1. See Appendix for Pinto Valley’s Mineral Reserve and Resource Estimate as at December 31, 2018, or refer to the Company’s Annual Information Form for the year ended December 31, 2018 for full details. 2. Refer to the Company’s news release dated January 10, 2019 for full details. Cozamin 1. Refer to the Company’s news release of December 10, 2018 and January 2019 NI43-101 Report for full details. 2. Refer to the Company’s news release dated January 10, 2019 for full details. Santo Domingo Project 1. Refer to the Company’s news release of November 26, 2018 for full details. 2. C1 cash costs are net of magnetite iron and gold by-product credits and selling costs and is an alternative performance measure. Refer to "Alternative Performance Measures" in the Company’s news release of November 26, 2018 for full details. 3. Metal price assumptions Cu: $3.00/lb, Fe: $80/t concentrate @ 66% Fe FOB SD, Au: $1,290/oz. Refer to the Company’s news release of November 26, 2018 for full details. Solid Balance Sheet 1. This is an Alternative Performance Measure; refer to the Company’s Management’s Discussion and Analysis for the three months ended March 31, 2019 for full details. 2. Total includes cash and cash equivalent, short-term investments and cash balance within assets classified for sale and discontinued operations. See the Company’s Management’s Discussion and Analysis for the three months ended March 31, 2019 for full details. 3. Total cash repayments towards long-term debt from January 1, 2017 to March 31, 2019. See the Company’s Management’s Discussion and Analysis for the year ended December 31, 2018 and the three months ended March 31, 2019 for full details. 4. Adjusted EBITDA for continuing operations; excludes Minto. See the Company’s Management’s Discussion and Analysis for the three months ended March 31, 2019 for full details. 5. Source: Scotiabank Metals & Mining Research Daily, Base Metals Comp Tables, April 22, 2019. Peer Value Comparison 1. Source: EV FactSet as of April 11, 2019; 2019 Attributable Production Guidance: company reports - 2019 guidance taken at mid-point and shown on an attributable basis where applicable. 2. Source: company YE18 financial reports. Capstone production is for continuing operations and excludes Minto. 3. Source: Scotiabank Metals & Mining Equity Research Spotlight, April 8, 2019, P/NAV 8%. 4. Source: FactSet as of April 11, 2019. Copper Fundamentals 1. Source: Shane Nagle, CFA, Director – Mining Research, National Bank Financial, April 5, 2019; NBF source: NBF estimates and Wood Mackenzie. 2. Source: Bloomberg as of January 9, 2019. Positioned for the Long-Term 1. This is an Alternative Performance Measure; refer to the Company’s Management’s Discussion and Analysis for the three months ended March 31, 2019 for full details.

CAPSTONE MINING (TSX:CS) • 14

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SLIDE 15

CAPSTONE MINING (TSX:CS) • 15

APPENDIX

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SLIDE 16

Q1 2019 Sales from Continuing Operations1

1. In accordance with IFRS 5, Minto is considered a discontinued operation at December 31, 2018 and as such, Minto sales volumes are excluded. 2. Pinto Valley gold production reaches payable levels from time to time. Any payable gold production will be reported in the period revenue is received.

CAPSTONE MINING (TSX:CS) • 16

2019 2018 Q1 Total Q4 Q3 Q2 Q1

Copper (tonnes) Pinto Valley 12,507 49,754 11,968 14,465 11,190 12,131 Cozamin 3,507 15,349 3,974 4,350 3,194 3,831 Total 16,014 65,103 15,942 18,815 14,384 15,962 Zinc (tonnes) Cozamin 1,933 5,123 1,952 1,443 1,215 513 Lead (tonnes) Cozamin 616 1,140 508 440 192

  • Molybdenum (tonnes)

Pinto Valley 45 117 38

  • 35

44 Silver (000s ounces) Cozamin 273 1,030 291 333 206 200 Pinto Valley 54 235 60 67 48 60 Total 327 1,265 351 400 254 260 Gold (ounces) Pinto Valley2 98 1,717 1,170 (28) 401 174 Cozamin 29 68 68

  • Total

127 1,785 1,238 (28) 401 174

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SLIDE 17

Cozamin Materials Handling and Mine Access

  • Leveraging the geometry of the

Cozamin orebodies and ramp systems to build a one-way haulage loop to debottleneck the current haulage capacity

  • The proposed “Cruserso de San

Rafael” loop will connect two production ramp systems with a 1km drift at a capital cost of less than $5 million

  • The expected result is a 30%

increase in production by the end of 2020 and targeting annual production of 40-45 million pounds of copper

CAPSTONE MINING (TSX:CS) • 17

Conceptual One-Way Haulage Loop

See section 16 of the January 24, 2019 NI43-101 Technical Report for more information

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SLIDE 18

Santo Domingo Project – Proposed Infrastructure

CHAÑARAL DIEGO DE ALMAGRO CALDERA COPIAPÓ DESIERTO de ATACAMA AIRPORT SANTO DOMINGO PORT AND DESALINATION Concentrate Pipeline Water Pipeline Public Roads Future Electric Line Bypass Future Bypass Roads

N

TSF MINE AND MILL Towns Distance from mine site to port is approx 110 km CAPSTONE MINING (TSX:CS) • 18

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SLIDE 19

Pinto Valley Mineral Reserve and Resource Estimate

Mineral Resource Estimate as at December 31, 2018

(metric units) Mineral Resources at 0.17% TCu Cutoff (Inclusive of Mineral Reserves) Contained Metal

Category Tonnes (million) Cu (%) Mo (%) Copper Metal (Mt) Molybdenum (Mt) Measured (M) 571 0.33 0.006 1.88 0.034 Indicated (I) 759 0.27 0.005 2.07 0.039 Total M + I 1,330 0.30 0.005 3.95 0.0073 Inferred 146 0.24 0.005 0.34 0.008

RESOURCE ESTIMATE NOTES: Claydon Craig, P.Eng., Superintendent of Mine Technical Services at Pinto Valley, is the Qualified Person responsible for the Pinto Valley Mineral Resources estimate. Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. Mineral Resources are presented inclusive of Mineral Reserves. Mineral Resources are reported as at December 31, 2018 above a 0.17% TCu cut-off grade. The economic assumptions for the reasonable prospects pit include: $3.30/lb Cu, $10.00/lb Mo, 88% Cu recovery, 50% Mo recovery, $1.50/ton mining costs, $1.50/ton G&A costs, $5.00/ton milling costs, and a pit slope of 45°. Totals may not tally due to rounding. Contained metals are reported at 100%. See Capstone’s Annual Information Form for the year ended December 31, 2018 for further information.

CAPSTONE MINING (TSX:CS) • 19

Mineral Reserve Estimate as at December 31, 2018

Mineral Reserve Contained Metal

Category Tonnes (million) Cu (%) Mo (%) Copper Metal (Mt) Molybdenum (Mt) Proven 255 0.33 0.006 0.84 0.016 Probable 153 0.28 0.006 0.43 0.009 Proven + Probable 408 0.31 0.006 1.27 0.025

RESERVE ESTIMATE NOTES: Claydon Craig, P.Eng., Superintendent of Mine Technical Services at Pinto Valley is the Qualified Person responsible for the Pinto Valley Mineral Reserves estimate. Economic inputs to the block model were USD$2.75/lb Cu and USD$12.50/lb Mo. Mineral Reserves are reported above 0.175% Cu cut-off grade. Summation errors due to rounding. Contained metals are reported at 100%. See Capstone’s Annual Information Form for the year ended December 31, 2018 for further information.

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SLIDE 20

Cozamin Mineral Reserve and Resource Estimate

Mineral Resource Estimate as at December 31, 2018

Mineral Resources (Inclusive of Mineral Reserves) Contained Metal

Category Tonnes (kt) Copper (%) Silver (g/t) Zn (%) Pb (%) Copper Metal (kt) Silver Metal (koz) Zinc Metal (kt) Lead Metal (kt) Measured (M) 407 1.24 53 1.23 0.40 5 698 5 2 Indicated (I) 16,709 1.50 44 1.25 0.27 250 23,813 208 46 Total M + I 17,116 1.49 45 1.25 0.28 255 24,506 213 47 Inferred 16,922 1.11 44 1.64 0.29 188 23,902 278 49

RESOURCE ESTIMATE NOTES: The Cozamin Mineral Resource estimate was completed by Garth Kirkham, P.Geo., FGC, Kirkham Geosystems Ltd., and an independent Qualified Person as defined by NI 43-101. The NSR formula used is based on $3.50/lb Cu, $18/oz Ag, $1.20/lb Zn, $1.00/lb Pb and metallurgical recoveries of 95% Cu, 78% Ag, 58% Zn, 40% Pb. The resulting NSR formula is Cu*65.024 + Ag*0.438 + Zn*10.755 + Pb*6.981. Mineral Resources are reported above $50/t NSR cut-off. Mineral Resources are presented inclusive of Mineral Reserves. Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. Figures may not sum due to rounding. Contained metals are reported at 100%. See Capstone’s Annual Information Form for the year ended December 31, 2018 for further information.

CAPSTONE MINING (TSX:CS) • 20

Mineral Reserve Estimate as at December 31, 2018

Mineral Reserve Contained Metal

Category Tonnes (kt) Cu (%) Ag (g/t) Zn (%) Pb (%) Copper Metal (kt) Silver Metal Troy (koz) Zinc Metal (kt) Lead Metal (kt) Proven

  • Probable

6,050 1.58 43 0.72 0.14 96 8,293 43 8 Proven + Probable 6,050 1.58 43 0.72 0.14 96 8,293 43 8

RESERVE ESTIMATE NOTES: Tucker Jensen, P.Eng., Senior Mining Engineer at Capstone Mining Corp., is the Qualified Person for the Cozamin Mineral Reserve. Disclosure of the Cozamin Mine Mineral Reserves as of December 31, 2017 was completed using fully diluted mineable stope shapes generated by the Maptek Vulcan Mine Stope Optimizer software and estimated using the 2018 MNFW and MNV resource block models completed by Garth Kirkham, P.Geo., FGC, Kirkham Geosystems Ltd. The Reserves are based on a $50/t NSR cut-off. The NSR formula used for the Reserves was based $2.75/lb Cu, $16/lb Ag, $1.10/lb Zn, and metallurgical recoveries of 96.5% Cu, 81% Ag, 44% Zn. The resulting NSR275 formula is ($50.707*%Cu + 0.366*Ag ppm + 7.276*Zn%)*(1-NSRRoyalty%)Note that zero value is attributed to Pb due to low concentrations. Tonnage and grade estimates include dilution and recovery allowances. The NSR royalty rate applied varies between 1% and 3% depending on the mining concession. Contained metals are reported as 100%. Figures may not sum due to rounding. See Capstone’s Annual Information Form for the year ended December 31, 2018 for further information.

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SLIDE 21

Santo Domingo Mineral Reserve and Resource Estimate

Mineral Resource Estimate as at December 31, 2018

Mineral Resources (Inclusive of Mineral Reserves)

Category Tonnes (Mt) CuEq (%) Cu (%) Au (g/t) Fe (%) Co (ppm) Measured (M) 66 0.81 0.61 0.081 30.9 254 Indicated (I) 471 0.48 0.26 0.034 25.0 225 Total M + I 537 0.52 0.30 0.039 25.7 229 Inferred 48 0.41 0.19 0.025 23.6 197

RESOURCE ESTIMATE NOTES: Mineral Resources are reported inclusive of Mineral Reserves. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. Mineral Resources are classified according to CIM (2014)

  • guidelines. The Qualified Person for the estimates is Mr. David Rennie, P.Eng., an associate of Roscoe Postle Associates Inc. Mineral Resources for the Santo Domingo Sur, Iris, Iris Norte and Estrellita deposits have an effective date October 31, 2018.

Mineral Resources for the Santo Domingo Sur, Iris, Iris Norte, and Estrellita deposits are reported using a cut-off grade of 0.125% CuEq. CuEq grades are calculated using average long-term prices of $3.50/lb Cu, $1,300/oz Au, and $99/dmt Fe. The CuEq equation is: % Cu Equivalent = (Cu Metal Value + Au Metal Value + Fe Metal Value) / (Cu Metal Value per percent Cu). The general equation for metal value is: Metal Value = Grade * Cm * R * (Price – TCRC – Freight) * (100 – Royalty) / 100, were Cm is a constant to convert the grade of metal to metal price units, R is metallurgical recovery, and TCRC is smelter treatment charges and penalties. An assessment of Mineral Resources for the Santo Domingo Sur, Iris, Iris Norte and Estrellita deposits was performedusinga Lerchs–Grossman pit shell that has the following assumptions: pit slopes averaging 45°; mining cost of $1.90/t, processing cost of $7.27/t (including G&A cost); processing recovery of 89% copper and 79% gold; selling price of $3.50/lb copper, $1,300/oz gold and $99/dmt iron concentrate. Rounding as required by reporting guidelines may result in apparent summation differences between tonnes, grade and contained metal content. See Capstone’s Annual Information Form for the year ended December 31, 2018 for further information.

CAPSTONE MINING (TSX:CS) • 21

Mineral Reserve Estimate as at December 31, 2018

Mineral Reserve Contained Metal

Category Tonnes (Mt) Cu (%) Au (g/t) Fe (%) Copper Metal (Mlbs) Gold Metal Troy (koz) Iron Concentrate (Mt) Proven 65.4 0.61 0.08 30.9 398 169.9 8.2 Probable 326.9 0.24 0.03 27.6 768 336.8 66.9 Proven + Probable 392.3 0.30 0.04 28.2 1167 506.7 75.1

RESERVE ESTIMATE NOTES: The Mineral Reserves estimate have an effective date of November 14, 2018 and were prepared by Mr. Carlos Guzman, CMC, and employee of NCL. Mineral Reserves are reported as constrained within Measured and Indicated pit designs and supported by a mine plan featuring variable throughput rates and cut-off optimization. The pit designs and mine plan were optimized using the following economic and technical parameters: metal prices of $3.00/lb Cu, $1,290/oz Au and $100/dmt of Fe concentrate; recovery to concentrate assumptions of a maximum of 93.4% for Cu and 60.1% for Au, with magnetite concentrate recovery varying on a block-by-block basis; copper concentrate treatment charges of $80/dmt, $0.08/lb of Cu refining charges, $5.0/oz of Au refining charges, $33/wmt and $20/wmt for shipping Cu and Fe concentrates respectively; wasteminingcostof $1.75/t, mining cost of $1.75/t ore, and process and G+A costs of $7.53/t processed; average pit slope angles that range from 37.6° to 43.6°; a 2% royalty rate assumption, and an assumption of 100% mining recovery. Rounding as required by reporting guidelines may result in apparent summation differences between tonnes, grade and contained metal content. See Capstone’s Annual Information Form for the year ended December 31, 2018 for further information.

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