NEAR TERM PRODUCER,

HIGH-MARGIN GOLD

RED MOUNTAIN

PROJECTNorthwestern British Columbia

July 4, 2018

Forward Looking Statements

DISCLAIMER

The information provided in this presentation is not intended to be a comprehensive review of all matters and developments concerning the Company and shouldbe read in conjunction with all other disclosure documents of the Company. The information contained herein is not a substitute for detailed investigation oranalysis. No securities commission or regulatory authority has reviewed the accuracy or adequacy of the information presented.

FORWARD-LOOKING STATEMENTS

This presentation contains statements and information that constitute forward-looking information within the meaning of Canadian securities legislation, referred toherein as "forward‐looking statements“. These statements include, among others, statements with respect to the amount of mineral resources, delivery of anupdated Feasibility Study, including but not limited to, gold and silver price assumptions, exchange rate assumptions, cash flow forecasts, project capital andoperating costs, refining costs, royalties, credits, sustaining and closure costs, processing rates, metal or mineral recoveries, recovery methods, mine life and annualoperating periods, construction and commissioning period and other anticipated timelines, closure and reclamation plans, production rates, estimated net presentvalue, internal rates of return and payback periods, the Company’s potential plans and operating performance; the estimation of the tonnage, grades and content ofdeposits and the extent of the resource and reserve estimates; potential production and viability of the Red Mountain Project as set out in the 2017 FeasibilityStudy; environmental approval plans and anticipated timing of environmental approvals, completion of a Benefits Agreement, opportunities to enhance the value ofthe Red Mountain Project, capital cost reduction opportunities and other plans and objectives of IDM. These statements address future events and conditions and,as such, involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements to be materiallydifferent from any future results, performance or achievements expressed or implied by the statements. Such factors include, among others and in addition tothose described elsewhere in this presentation, delays in obtaining or inability to obtain required government or other regulatory approvals, permits or financing,the risk of unexpected variations in mineral resources or reserves, grade or recovery rates, of failure of plant, equipment, processes or infrastructure to operate asanticipated, of accidents, labour disputes, and unanticipated delays in completing other development activities, the risk that estimated costs will be higher thananticipated and the risk that the proposed mine plan and recoveries will not be achieved, equipment breakdowns and bad weather, the timing and success of futureexploration and development activities, exploration and development risks, mineral resources or reserves are not as estimated, title matters, third party consents,operating hazards, metals prices, political and economic factors, actions by governmental or regulatory authorities including changes in tax laws or incentiveprograms, competitive factors and general economic conditions. In making the forward-looking statements the Company has applied several material assumptions,including, but not limited to, the assumptions that: required approvals, permits and financing will be obtained on a timely basis; the proposed exploration anddevelopment will proceed as planned; with respect to mineral resource and reserve estimates, the key assumptions and parameters on which such estimates arebased are accurate; that the proposed mine plan and recoveries will be achieved; that capital costs, sustaining costs, other costs referred to herein, royalties andtaxes will be as estimated; and that no unforeseen accident, fire, ground instability, flooding, labor disruption, equipment failure, metallurgical, environmental orother events that could delay or increase the cost of the development will occur, and market fundamentals will result in sustained metals and mineral prices. Actualresults may vary from those implied or projected by forward-looking statements and therefore investors should not place undue reliance on such statements. Theforward-looking statements herein are made as of the date of this presentation and the Company expressly disclaims any intention or obligation to update or reviseany forward-looking statements whether as a result of new information, future events or otherwise except as required by applicable securities legislation.

TECHNICAL DISCLOSURE

The technical information in this presentation has been approved by Rob McLeod, P. Geo, President and CEO of IDM Mining Ltd. and Ryan Weymark, P.Eng., Vice-President of Project Development. Both are ‘Qualified Persons’ under NI 43-101.

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June 2018 Status Update

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Closed $4.3 million financing April, 2018

Resource Update announced June, 2018: 20.7% increase in M&I ounces to 704,600 at 7.9 g/t Au and 22.7 g/t Ag

Updated Feasibility Study to incorporate new resources and value optimization from previous 2017 Study

EA/EIS Review Process nearing completion

IBA Negotiations with Nisga’a Nation nearing completion

Underground access opened for season; trenching underway at Lost Valley

Exploring M&A Opportunities

IDM Mining Value Proposition

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Potential Construction Start within 1 Year: near-term, high-grade underground gold deposit in a pro-mining jurisdiction

Low Permitting Risk: project de-risking imminent through EA Certificate Approval and IBA with Nisga’a expected during summer of 2018

Undervalued: Company in the typical pre-development trough; below comparable development stage $/NAV

High-grade and Low-cost: Near-surface bulk mineable, high-grade, well-drilled and potentially high-margin producer at an affordable capex

Feasibility Study Update for 2018: potential changes to mining method and mineral processing may significantly reduce operating and sustaining costs

Growing Resource Base: significant exploration upside throughout property; updated 2018 resource estimate

Corporate Flexibility: Potential Golden Triangle operating synergies, M&A and exploration opportunities with other junior companies

2018 Mineral Resource Estimate

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• Resources are reported at a 3.0 g/t Au cut-off• Please refer to IDM’s press releases dated January 23, 2017 and June 19, 2018 for Mineral Resource Estimate details and disclosure

Classification TonnesAu

(g/t)Ag

(g/t)Ounces

AuOunces

Ag

Measured 1,827,900 8.92 28.30 524,000 1,663,300

Indicated 943,400 5.95 11.98 180,600 363,500

Measured + Indicated

2,771,300 7.91 22.75 704,600 2,026,800

Inferred 316,000 6.04 7.60 61,400 77,200

Measured gold ounces increased by 39.2% or 140,600 oz Au

Measured and Indicated gold ounces increased by 20.7% or 120,900 oz Au

Initial Resources reported for Smit, SF, Bray, Chicka and Cambria Zones

Revised geological interp. (identification of high-amplitude folds) opens up significant exploration potential

2017 drilling significantly expanded up and down-dip of AV and JW Zones, extending to Smit zone

M&I tonnes increased by 33.6%

Virtually all of Marc, AV and JW resources are M&I

Initial Resources reported for Smit, SF, Bray, Chicka and Cambria Zones

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Geology & Resource Update (2018)

IDM Today

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TSX.V: IDM

Shares Outstanding 449.0M

Options 30.8M

Warrants 55.3M

Fully Diluted 535.2

Recent Share Price $0.07

Market Cap (C$M) $31.4M

INSTITUTIONAL

Delbrook - RBC – Gold2000 – Libra – Earth Resource – Mackenzie – US Global – Ruffer– Sprott – Brompton – Middlefield –Dundee – Extract

CORPORATE

Osisko Royalties – Osisko Mining – Kinross Gold

Red Mountain Location

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17,125 hectares

Inexpensive grid power nearby

Stewart is a pro-mining area

Within Nisga’a Treaty Territory

Provincial/Federal ReviewsEAC/EIS

Mine Development Timeline

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PermittingMAPA/EMA

Value Engineering

2018 2019 2020 20212017

FeasibilityEngineering

Baseline StudiesEAC EIS

2018 FS

Basic/Detailed Engineering

Early Works Construction

First Gold

Ongoing Exploration

2017 FS

Updated Feasibility Study in 2018

Additional Resources – Incorporate 2018 Resource Estimate into a revised underground mine plan Additional 696,000 M&I tonnes from 2017

Mine Plan – Incorporate the Value Engineering recommendations into a revised mine plan, including revised longhole/C&F transition and Holloway method. Significant potential sustaining capital savings

Throughput – Incorporate the Value Engineering recommendation to increase throughput from 1,000 tpd to 1,200 tpd. Target >100,000 oz/year gold production during first two years

Capital Costs – Incorporate results from Value Engineering, including optimized infrastructure footprint

Operating Costs – Incorporate revised Mining Operating Costs based on revised Mine Plan and optimized grinding circuit

Revised Execution Plan – Incorporate fixed-price EPC costs

Metal Prices – Update gold and silver prices, FX

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Undercut for waste drilling

Undercut for ore drilling

Overcut for ore drilling

Undercut for ore drilling for Upper Level

Mining Optimization

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Maximize Low Cost Methods

Continuing to OPTIMIZE the mining methods to decrease capital and operating costs

Holloway Method (HMT)

L-H Method

Convert to L-H Method

Convert to HMT Method

1 Waste is drilled, blasted and mucked from undercut

Ore is drilled, blasted and mucked out from undercut2

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1

Overview

Project Infrastructure

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Process Plant

TMF

Soil Stockpile

Access Road to Highway 37A

Haul Road to Mine Site

Mine Site

2017 Highlight Drill Results

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*True widths for the 2017 highlight drill results are estimated to be 60% - 100% of intersected widths.**All grades on this slide are uncapped.

AV Zone

7m of 14.62 g/t Au & 79.26 g/t Ag from 146m

7m of 6.00 g/t Au & 16.78 g/t Ag from 127m

25m of 8.92 g/t Au & 37.69 g/t Ag from 101m

14m of 5.37 g/t Au & 14.19 g/t Ag from 102m

25m of 13.67 g/t Au & 30.91 g/t Ag from 83m

JW Zone

8.6m of 12.33 g/t Au & 70.90 g/ Ag from 159.4m

14m of 10.65 g/t Au & 17.37 g/t Ag from 159m

17.25m of 7.19 g/t Au & 51.67 g/t Ag from 172.75m

Marc Zone

4.88m of 149.24 g/t Au & 59.88 g/t Ag from 62.12m

6.89m of 26.61 g/t Au & 88.19 g/t Ag from 52.16m

JW/SF Zone

3.78m of 38.27 g/t Au & 59.39 g/t Ag from 228.77

U17-1232: 7m of 6 g/t Au & 16.78 g/t Ag

AV ZONE

MARC ZONE

U17-1289: 4.88 m of 149.24 g/t Au & 59.88 g/t Ag

2018 Resource Estimate by

Zone

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Zone Class TonnesAu

(g/t)Ag

(g/t)Ounces

AuOunces

Ag

Marc 715,100 10.65 41.46 244,800 953,300

AV Measured 837,200 7.75 19.77 208,700 532,200

JW 275,600 7.96 20.07 70,500 177,800

Total 1,827,900 8.92 28.30 524,000 1,663,300

Marc 9,300 11.02 45.63 3,300 13,700

AV 116,500 8.47 20.81 31,700 78,000

JW 150,500 7.24 18.48 35,000 89,400

141 234,700 4.86 7.04 36,700 53,100

Smit 241,400 4.54 4.64 35,200 36,000

Marc FW Indicated 28,600 5.76 10.79 5,300 9,900

Marc Outliers 12,100 5.24 28.64 2,000 11,100

NK 37,500 7.40 8.26 8,900 9,900

JW HW 39,900 5.66 32.28 7,300 41,400

Bray 57,100 5.68 10.43 10,400 19,100

Chicka 15,800 9.46 3.82 4,800 1,900

Total 943,400 5.95 11.98 180,600 363,500

M&I 2,771,300 7.91 22.75 704,600 2,026,800

AV 3,200 9.32 12.27 900 1,200

JW 4,900 8.83 16.88 1,400 2,600

141 18,000 4.67 3.86 2,700 2,200

Smit 48,100 5.28 2.26 8,200 3,500

Marc FW 21,400 4.61 1.95 3,200 1,300NK Inferred 500 6.79 8.19 100 100

JW HW 2,100 7.22 3.55 500 200

JW FW 4,800 16.09 33.78 2,500 5,200

SF 54,600 6.88 17.55 12,100 30,800

Bray 73,800 4.66 7.49 11,100 17,800

Chicka 600 5.30 1.57 100 0

Cambria 84,000 6.89 4.54 18600 12300

Total 316,000 6.04 7.60 61,400 77,200

• Resources are reported at a 3.0 g/t Au cut-off

• Please refer to IDM’s press release dated June 19, 2018 for Mineral Resource Estimate details and disclosure

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2018 Mineral Resource Classification

Decline & 2017 holes

2018 Revised Geological Interpretation:AV & 141 Zones Section 1350N

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2018 Grade Block Model

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2018 Grade Block Model and Marc Zone

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Marc Zone

Chicka Zone

141 Zone

AV Zone

141 – Marc Zone Gap Looking South

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Marc Zone

Chicka Zone

141 Zone

AV Zone

141 – Marc Zone Gap Looking South

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JW Zone

AV Zone

Decline

Smit Zone

Smit Zone Looking North

Project Permitting

Underground mine and small project footprint limit environmental impact and simplify permitting

Extensive environmental baseline studies completed in project area over past 20 years

Project Application and EIS accepted and under review

Strong relationship with Nisga’a Nation (Treatied). IBA target July 2018

Anticipate Environmental Assessment Certificate Q3 2018

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Exploration UpsideReceding glaciers are uncovering new areas for exploration

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Lost Valley; Au-Ag VeinsMapping & Trenching Underway

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Life Cycle Of A Gold Company

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Next Steps and News Flow

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Resource Update announced June, 2018: 20.7% increase in M&I ounces to 704,600 at 7.9 g/t Au and 22.7 g/t Ag

Update Feasibility Study to incorporate new resources and value optimization targeting autumn 2018 completion

Benefits Agreement with Nisga’a Nation targeting July 2018

Trenching and sampling results from Lost Valley, July 2018

EA/EIS Certificate Decision expected late Q3 2018

Drilling program expected late Q3/Q4 2018

Exploring M&A Opportunities

Contact IDM

TRADING SYMBOLSIDM Mining Ltd. (TSX.V: IDM – OTC.QB: IDMMF)

CONTACT USRob McLeod, President & CEO604.617.0616rm@idmmining.com

Vanessa Pickering, Manager Corporate Communications604.202.2940vp@idmmining.com

CORPORATE OFFICE1800-555 Burrard StreetVancouver, BC V7X 1M9604.681.5672www.idmmining.com

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Appendix

28. IDM Values

29. IDM Team

30. Red Mountain Geology And Mineralization

31. Geological Interpretation: Simplification Suggested By D. Sillitoe And Talisker Geologists

32. Revised Geological Interpretation – JW Zone Section 1550N

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Vision

IDM Mining’s vision is to become a dividend-paying, high-margin gold producer through advancement of the Red Mountain

Gold Project, accretive exploration, development and production, with the objective of maximizing value for its shareholders.

Core Values

• ONE TEAM of Directors, Officers, Employees, working on behalf of all IDM Shareholders

• To prioritize the team’s health and safety on and off the job

• Respect for the Land, with care for the wildlife that inhabits it

• To maximize employment and business opportunities, giving priority to northerners living in British Columbia, particularly

residents of Stewart, and Nisga’a Citizens

• Inspired by traditional use of the land and mining pioneers, operate creatively and effectively in the challenging northern

terrain

• Foster business and professional relationships through mutual respect, meaningful engagement and understanding

• Operate with honesty, fairness and transparency

• Be an equal opportunity employer and create a work environment that encourages employees to voice their opinions

Mission

To explore, develop and mine the Red Mountain Gold Project in northwest British Columbia. IDM will deliver its mission by

focussing on the following objectives:

• Engineer, construct and operate a high-grade underground mine

• Proceed through the permitting processes, working with all Stakeholders, including Federal, Provincial and Local

Regulators and the Nisga’a Lisims Government

• Adhere to high industry standards of health, safety, environment and community relationships

• Finance ongoing exploration, development, permitting and construction of Red Mountain with supportive and effective

Corporate, Institutional and Retail Shareholders

• Effective stewardship of the Company’s assets

• Attract, retain and develop an exceptional team in all aspects of the Company’s Operations

Our Team

Management

Robert McLeod, P.Geo President, CEO and Director

Michael McPhie, Chairman

Susan Neale, CFO

Ryan Weymark, P.Eng VP Project Development

Vanessa Pickering, Manager Corporate Communications

David Green, Mine Manager

Board of Directors

Duncan Middlemiss, CEO Wesdome Mines

Andree St-Germain, CFO Integra Resources

David Parker, Former Teck VP & Sustainability

Andrew Farncomb, VP & Director Contact Gold

Terry Harbort, Talisker Exploration (Osisko Royalties)

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Simplification Suggested ByD. Sillitoe And Talisker Geologists

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2018 Revised Geological Interpretation;JW Zone Section 1550N

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