IR-DAY2018 1 Komatsu IR－DAY 2018

Overview of Underground mining business

September 14th, 2018 Masayuki Moriyama Senior Executive Officer President, Mining Business Division Chairman, Komatsu Mining Corp. IR-DAY2018 Various Mineral Resources 2

• Mineral resources are generated through several geologic effects. • Coal is usually categorized as Soft Rock, while other minerals such as Ferrous and Non-Ferrous are called as Hard Rock.

# Generation of deposits Major Mineral Resources

Platinum, Chromium, Magmatic deposit Titanium, Magnetite Generated Hard Igneous ① from Rock rock Magma Gold, Copper, Silver, Lead, Zinc, Hydrothermal Tin, Tungsten, deposit Molybdenum, Uranium

Sedimentation/Weathering/ Erosion Sedime Hematite, Nickel, ② ntary Boxite, Lithium, etc rock

Geothermal effect/Crustal rising Soft Rock *1 ③ Coal -

※1 Coal is not defined as “rock” in geological respect. Generation process of IR-DAY2018 Mineral Resources (1/2) 3 • Minerals derived from magma were generated in the depths of underground. 1) In case deposits exist beneath and relatively near from ground level, Open Pit Mining/Strip Mining methods are adopted. 2) In case deposits exist in the depths below geological formations, Underground Mining methods are adopted. 3) Open pit mines might shift to underground methods as they get deeper. 1.Magmatic deposit 2.Hydrothermal deposit 1) Typical minerals: 1) Typical minerals: Platinum, Chromium, Titanium, Gold, Copper, Silver, Lead, Zinc, Tin, Magnetite, etc. Tungsten, Molybdenum, Uranium, etc. 2) Generation process 2) Generation process ・In case Magma is slowly cooled, ・Hydrothermal mineral solution melted metal sulfide (containing Platinum, (containing metal elements) had been Chromium, Titanium or others) had been pushed up by high vapor pressure, separated and concentrated by specific precipitated and filled chasms in and gravity and generated deposit. generated deposits. Underground Isolated waterway magma

Magma Magma Generation process of IR-DAY2018 Mineral Resources (2/2) 4 • Sedimentary rocks exist widely on the earth, where Open pit / Strip Mining methods are mainly adopted. • Coal is generated from sediment of plant fossil, which is explored both by Strip Mining and Underground Mining. 1. Sedimentation/Weathering/Erosion 2. Geothermal effect/Crustal rising 1) Typical minerals: 1) Typical minerals: Coal Hematite/Nickel/Boxite/Lithium/ Phosphate/others 2) Generation of coal ・Fossil of plants sedimented and generated 2) Generation of Hematite peat. Physical pressure & heat processed ・Cyanobacteria had oxidized iron in the sea dehydration & decarboxylation in the long and made iron rust, which had sedimented period, and evolved: peatlignite sub- in the bottom of the ocean, made deposit bituminous coalbituminous coal of hematite, and then rose up to appear anthracite, having increased calorie in the above the ground level. above order. Heat 4 bil years ago 2 bil years ago 1.5 bil years ago Heat Iron mine Iron oxide Pressure

iron Rising

Step1 Step2 Step3 Iron of ground Iron oxide was The deposit uplifted

was solved into generated and from seafloor and Sub bituminous Bituminous Wood Peat Lignite Anthracite the sea. sedimented on became iron ore coal coal

the seafloor. mine. Dehydration Decarboxylation Demethane IR-DAY2018 Mining methods 5

• Komatsu became a full line equipment supplier in IN-PIT operation through the acquisition of KMC in 2017. • Today, we will explain UG business.

For Surface mining For Underground mining

Hydra Mecha Elec. Contin Roof Road Bulldo Motor Dump ulic nical Rope Drag Shee Notes: Wheel Drill uous Truck Suppo head LHD zer grader truck Excava Wheel Shovel line rer Loader Miner rt er tor Loader KMC ✓ ✓ ✓ ✓ ✓ ( ) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ IR-DAY2018 Methods of UG Soft Rock - Room & Pillar 6

• UG Soft Rock methods are consisted of “Longwall” and “Room & Pillar”. • Room & Pillar is the oldest method. Rooms are dug progressively in a grid and mineral is extracted. For safety purpose, a part of the mineral layer is left to serve as pillars, which supports the roof as the extraction proceeds. It is highly cost efficient (initial investment and maintenance costs). However, the part of the mineral retained in the pillars cannot be mined and will become lost opportunity.

1.Machines 2.Methods (Detailed)

1) Continuous Miner 2) Mobile Bolter 2) • 1) Continuous Miner will 1) excavate room. • Room will be Pillar reinforced by 2) Mobile Bolter. • Excavate room • Reinforce aisle and pillar • Coal will be hauled 3) Shuttle Car 4) Feeder Breaker 3) by 3) Shuttle Car 4) 5) to 4) Feeder Breaker and 3) 3) grinded.

• Convey excavated • Grind 5) • Excavated coal will be coal excavated coal hauled by 5) Flexible 5) Flexible Conveyor Train to outside. Conveyor • Haul the coal to Train outside. IR-DAY2018 Methods of UG Soft Rock - Long Wall 7

• Longwall is one of the development approach for the underground mining and this is basically suitable for soft rock (coal). This approach will prevent rock fall by supporting the ceiling, and to carve the coal line by line, carrying out carved rocks by Conveyor • Initial cost is higher than Room and Pillar, but it can continuous excavation and it has High productivity. 1. Advance preparation 2. Coal excavation • At first, Entry drivers ・Shearer will will excavate entry excavate coal tunnel. layer. ・After that, Armored Face Conveyor will haul excavated coal. • After developing aisle, the equipment is set ・After excavated up to excavate and move forward one row, the convey coal equipment move • The equipment is forward. composed of 3 parts

Roof • ”Roof Support” the Shearer Support machine supporting Coal layer the ceiling, ”Shearer” ・Collapsed at the the one carving the Colla back. coal layer, and psed Conveyor which is also Armored called “Armored Face Face Conveyor” is the one Conveyor shipping the rock IR-DAY2018 UG Soft Rock Outlook 8

• Coal demand for electricity generation is forecasted still stable. • Komatsu continues to provide for coal customers much higher quality products and services and fulfill social responsibility. ① Primary energy forecast ②Coal production forecast (by country) in the world (by minerals) Other Indonesia (Unit: British thermal unit) India USA History Projection China 250 8,000 petroleum and other liquids 229 (Unit: Million ton)

200 182 coal 6,000 161 150 129 natural 4,000 100 gas

renewables 50 38 2,000 nuclear 0

0 1990 2000 2010 2020 2030 2040 2011 2012 2013 2016 2017 2019 2021 2023 2025 2030 2035 2040 Source:EIA International Energy Outlook 2018 (IEO2018) Source: Komatsu estimation IR-DAY2018 Methods of UG Hard Rock - Block Caving 9

• UG Hard Rock methods are roughly divided into Supported methods and Unsupported methods. • Block Caving method is for large deposit. After establishing a room under a mineral vein, its roof is dug in an inverted conical shape, and the ore falls into the room under the pressure of its weight. The mineral ore that has fallen through is brought to the surface through the room. Minerals will be hauled through mine tunnels.

Supported methods Unsupported methods Shrinkage Cut and fill Sublevel Sublevel Block Room&Pillar Stoping Stoping Caving Stoping Caving 工法

UG HRock Production ratio: 20% 30% 30% 20% UG HRock No of mine ratio: 15% 50% 30% <5%

Transport Ventilation Block Caving method (Image) Water Product Refinery Electricity Ore Grinding Concentrate Flotation

Mineral LHD

Conveyor/Locomotive Lift Crusher IR-DAY2018 UG Hard Rock Outlook 10

• Market size of mining business is increasing. • In underground mining, hard rock segment will increase relatively. • As Open-pit mines are becoming deeper, it is difficult to mine high grade ores, haulage cost of overburden will increase. • So, some portion of Hard rock mining will shift from Surface to Underground operation.

① Market size(2017) ② Market size(2040)

Market size total Market size total 40.2 Billion USD 54.3 Billion USD UG, 23.4 UG, 14.9 Surface, 37% 43% Surface, 63% 25.3 57% 30.9

Soft rock UG, Soft rock UG, Hard rock, Soft rock -Other 14.9 Hard rock, Soft rock -Other 23.4 5.4 -coal, 6.8 minerals, Billion 10.8 -coal, 7.7 minerals, Billion 2.7 USD 4.9 USD 36% 46% 18% 46% 33% 21%

0% 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100%

Source: Komatsu estimation IR-DAY2018 UG Hard Rock Product Strategy 11

• We aim to develop products which are not existing, but delivering more value to customers “Dantotsu Product” for expanding our market share. • No Blasting (Safety), No Diesel (Environment), No Batch (Productivity) ⇒ Underground mining automation factory ① Conventional excavation method ② “Dantotsu” UGHR products instead of D&B (Drilling and Blasting : D&B) •DynaMiner: excavated by Dynamic Disc Cutting based on undercutting technology No Blasting =>Safety, Reduce support , Flexible tunnel shape, Working environment improvement ① Drill ②Charge •Mining TBM(Tunnel Boring Machine): No Batch excavated by many disc cutters => Safety, Rock support reduction, ⑧Survey Working environment improvement ③ Blast Rapid excavation ④Vent = early production start No Diesel ⑦Bolt •Hybrid LHD: =>Reduce emissions & ⑥Scale ⑤ Muck & Haul temperature raise in tunnel :Improve health & working environment, Reduce ventilation cost

• Complementation between Key words at “Dantotsu” UGHR products TBM, DynaMiner, D&B • To improve productivity by No Blasting No Batch No Diesel innovating Drill jumbo