Download to read offline
UndergroundMiningMiningMethod.pptx
- 1. UNDERGROUND MININING Presented by: MDMOJAHIDUL ISLAM Course Name: MINING METHOD Submission Date: 2021-09-28 School of mines,CUMT
- 2.
- 3. WHAT ARE THETHREE TYPES OF UNDERGROUND MINING? Three classes: 1. Unsupported, 2. Supported, 3. Caving methods What are the fourmaintypes of mining? miningmethods: underground, opensurface (pit), placer, andin-situmining The American Geosciences web site defines fourmain. •Undergroundmines are more expensiveand are often used to reach deeper deposits. •Surface mines are typicallyused for more shallowand lessvaluable deposit
- 4. What are the2 main types of mining? 1. Surface mining 2. Subsurface (underground)mining 85% of minerals (excluding petroleum and natural gas) in the United States, including 98% of metallic ores. Surface mining Subsurface mining
- 5. Types of EquipmentUsed In Underground Mining:
- 6. Underground hard-rock mining A 3Ddiagram of a modern underground mine with shaft access
- 7. Underground hard-rock miningrefers to various underground mining techniques used to excavate "hard" minerals, usually those containing metals, such as ore containing gold, silver, iron, copper, zinc, nickel, tin, and lead. It also involves the same techniques used to excavate ores of gems, such as diamonds and rubies. Soft-rock mining refers to the excavation of softer minerals, such as salt, coal, and oil sands. Underground hard-rock mining
- 8. Mining Access of Undergroundhard-rock mining Underground access 1. Declines 2. Shafts 3. Adits Ore access: Levels are excavated horizontally off the decline or shaft to access the ore body. Stopes are then excavated perpendicular (or near perpendicular) to the level into the ore. Decline portal Stopes A large stope in the Treadwell gold mine, Alaska 1908; an example of shrinkage Stoping.
- 9. 1.Ventilation 2.Ground support 3.Area groundsupport 4.Local ground support Underground hard-rock mining Door for directing ventilation in an old lead mine. The ore hopper at the front is not part of the ventilation.
- 10. Underground soft-rock mining Undergroundsoft-rock mining is a group of underground mining techniques used to extract coal, oil shale, potash, and other minerals or geological materials from sedimentary ("soft") rocks . Because deposits in sedimentary rocks are commonly layered and relatively less hard, the mining methods used differ from those used to mine deposits in igneous or metamorphic rocks (see underground hard-rock mining). Underground mining techniques also differ greatly from those of surface mining. Underground mining of oil shale in VKG Ojamaa mine in Estonia
- 11. Methods of undergroundsoft rock mining 1.Longwall mining 2.Shortwall mining 3.Coal skimming 4.Blast Mining 5.Continuous Mining Longwall mining Blasting Mining Shortwall Mining
- 12. THAT’S ALL OFUNDERGROUND OF MINING THANK YOU