Underground mining - SlideShare

The tunnels that are dug are horizontal and are called drifts. Drift mining was really dangerous in the early days. Many tunnels caved in trapping and killing miners. Ore was often mined this way. Ore is rock with minerals …

(PDF) Underground mining Methods - ResearchGate

orebody configuration thr ough underground drilling. 1) Longwall mining. 2) Room-and-pillar mining. 3) Blast mining. 4) Shortwall mining. 5) Coal Skimming. perform an economic evalua tion of the ...

Underground Ramp Design Parameters - QueensMineDesignWiki

The typical gradient range for underground ramp systems is between 10% and 15.5% (1), although in some high volume mines with larger trucks (such as is often the case in Australia) (1), they can be in a range more similar to that of open pit haul roads, 6% to 10% (3). It is important to identify your goals in terms of an ideal ratio of capital ...

A Beginner's Guide to Underground Mining

In this method, you must drill a downwards ramp next to the ore deposit. This ramp should run from the surface level down as far as the ore deposit goes. Next, you can drill a horizontal cut from one side of the ore deposit to the other. …

Glossary of Mining Terms - SEC

Bulk mining - Any large-scale, mechanized method of mining involving many thousands of tonnes of ore being brought to surface per day. ... Drift - A horizontal underground opening that follows along the length of a vein or rock formation as …

The Claude Harvey: Underground Mining - Blogger

Underground Mining. Drift mining is where the coal seam intersects the surface. The mine enters the seam in a horizontal direction. Advantages of drift mining is its a easy way to mine, its a cheap way to …

Underground Mining and Its Methods - BusinessTech

Drift and Fill. To mine the ore zone with enough width for drifting method they will use drill and fill. In this method, the first drift will advance in the ore, and then consolidate the fill to backfill it. ... Dangers of Underground Mining. Underground mining can be dangerous with the wrong management. The most common hazards due to mining ...

Underground Mining Methods - UFRGS

Underground Mining Methods and Applications Production Headframe Hans Hamrin* 1.1 INTRODUCTION Ore is an economic concept. It is defined as a concentration of ... normal drifting where drift dimensions equal the width and height of the stope. Where geological conditions are favorable, stopes can be large, and big drill jumbos can be used for ...

Earth Science: Underground Coal Mining. - Blogger

Underground Coal Mining. There are 5 types/ways of underground coal mining. 1: Drift Mining. Drift Mining is possible where the coal seam intersects the surface. The mine enters the seam in a horizontal direction following the coal. A drift may or may not intersect the ground surface. This kind of mining is done when the rock or mineral is on ...

Crosscut and drifts - bisbee

The Bisbee underground mines reached this extreme size because of several reasons . The early exploration of ore was done with the driving of drifts, raises and sinking of shafts vastly increased the mines size. ... Code of Safe Practice for Drift Mining 1955, Phelps Dodge Corporation pp.1 -67. Richard Graeme IV 2010, pers. comm., 8 February.

Drift Mining, Mining Process, Mining Techniques, Gold, Zinc, Coal ...

Drift mining is a process of accessing precious geological material, like coal, by cutting into the side of the earth, rather than tunneling directly downwards. Drift mines have flat entries into the coal seam from a hillside. Drift mines are different from slope mines, which have a tending opening from the surface to the coal vein.

The Drift: NORCAT Underground Centre opens its …

The Drift features profiles on the people, companies and institutions making important contributions to Greater Sudbury's mining sector. From exploration, operation and remediation to research and innovation, this …

Abstract - USGS

Each underground mining model includes the cost of development, daily production, and mine plant construc­tion and operation. Using equation 4 or 5, daily mine capacity of ore can be calculated for an underground evaluation. ... Development includes a haulage drift, raises for access to drill overcuts, undercut of the complete area below the ...

Underground Mining Methods | PDF | Mining | Secondary Sector …

Drilling and Drift Jumbo blasting. Underground Mining Methods Sequence Chart 3. There are many new terms and concepts related with underground mining methods. To demonstrate your understanding of the basic concepts, create a Sequence Chain outlining the steps that occur in the method you selected. There are six steps presented on the next page.

CDC - Mining - DRIFT Software - NIOSH

DRIFT is a program to design perimeter control blast rounds for typical underground drifting applications. The design utilizes current methods of perimeter blasting with the added design element of a buffer row coordinated with the perimeter row to reduce perimeter damage.

Coal Mining, Kentucky Geological Survey, University of Kentucky

Underground modes of access include drift, slope, and shaft mining, and actual mining methods include longwall and room and pillar mining. Drift mines enter horizontally into the side of a hill and mine the coal within the hill. Slope mines usually begin in a valley bottom, and a tunnel slopes down to the coal to be mined. Shaft mines are the ...

Underground Blasting Drilling - ISO Certified manufacturer of …

Due to only one free surface underground. Underground Blasting is the main method to cave the tunnel, inclined well and vertical well or for underground mining etc. The underground drill rig is most suitable for this application. Flowing topics are discussed in details: Introduction Cut design Parallel cut blasting Inclined cut blasting Blasting geometry Drill …

Underground Mining

Drift Mining: Is where the surface is intersected with it.At a horizontal direction is how the mine enters the surface.This method is more of an economic way,because you don't have to dig deep in the earth. Room & pillar mining: Most of all underground mining is done with the use of this method.First the rooms are cut into a coal bed, then the ...

Types of Underground Mining Method Comparison

A discussion of Underground Mining also loses much of its value unless costs are considered, because the expectation of profit is the only excuse for carrying on mining at all. ... Drift stoping. Cutting out, or lead stoping. …

News | Underground Mining | Mining Connection — The Link …

Comstock Mining Completes Harris Portal Underground Exploration Drift at Lucerne Gold Mine, Nevada. January 4, 2016. Comstock Mining Inc. has completed the entire 800-foot underground exploration drift (Harris Portal) at the north end of the existing surface mining operation of the Lucerne underground exploration and underground drift development.

Glossary of Mining Terminology - Miners' Museum

Draegermen - A mine worker or official, engaged in mine rescue while wearing a self-contained breathing apparatus. Drift - The passage through which air is drawn into the mine. Drill - Any tool used for boring holes underground. Drive – To excavate a passage. Driver - A workman, usually a boy, who drives an underground work horse.

Drifts/Inclined Shafts | Introduction | underground COAL

Drifts/Inclined Shafts. The angle at which a drift becomes an inclined shaft is somewhat subjective, but there is some agreement that anything above 30 o to the horizontal is a shaft, not a drift.. A major advantage of drift or inclined shaft access versus vertical shaft access is the ability to move large volumes of equipment, materials and personnel in a properly designed and …

Glossary of Hardrock Mining Terms

Diggers - The clothes a miner wears underground. Double-jack - 12 lb. sledge hammer. Drift - A horizontal tunnel driven along the mineral vein. Dry - The shower house for miners. Dry clothes are left there and diggers put on. Face - The end of the drift, crosscut, or tunnel, generally where the miners work.

Safe mining practices under wide spans in underground

Barrick's Cortez Hill underground mine tested the underhand drift and fill approach by exposing the CRF up to 10.7 m in 2016 . The CRF was designed to have a 28-day uniaxial compressive strength of 4.8 MPa at a binder content of 7.5%. From the same reference, 97% of the test samples exceeded the design strength based on 511 data points.

Assessment of Mine Haulage Drift Safety Using Probabilistic …

Abstract. Mine haulage drifts are the arteries of any mine, as they are used to transport the valuable ore out of the mining zones as well as to move operators and equipment. Hence, their stability is crucial in underground mines. Drift instability could lead to serious consequences such as injuries, production delays and higher operational cost.