Surface mining renders up a substantial percent that mining projects. Surface mining describes the removed of the terrain surface to accessibility minerals underneath. In particular, surface mining is offered to retrieve sand, gravel, stones, coal, iron and other metals.

You are watching: What is the difference between surface and subsurface mining

There are 5 recognized species of surface ar mining, every with specific variations depending upon the minerals gift extracted. These encompass strip mining, open-pit mining, mountaintop removal, dredging and highwall mining.

*

Why select Surface Mining?

Surface mining is regularly the choice for mining companies. This is because removing the terrain surface, or overburden, to accessibility the mineral beneath is often much more cost-effective 보다 gouging tunnels and also subterranean shafts to accessibility minerals underground.

This method is often taken into consideration safer, as well, and doesn’t need extensive electrical power rigging and also water piping.

*

Strip Mining

Strip mining gets its name from the fact that the procedure involves stripping the surface away native the mineral that’s gift excavated (usually coal). Soil, rock, and also vegetation end the mineral seam is removed with substantial machines, consisting of bucket-wheel excavators.

This type of mining provides sense when the mineral is near the surface. If the ore is too much under the surface, the process of piece mining i do not care impractical and needlessly damaging to the terrain.

Two types of strip mining exist, depending on the amount of ore under the surface, and the surrounding terrain. Lock are:

Area Stripping extracts ore over a large, flat terrain in lengthy strips. The overburden that rocks and soil is reduce in the previous piece so that long gaps no left in the planet after mining is complete.Contour mining is a variation of strip mining that adheres to the contours of outcrops and hilly terrains. Usually, the mineral seam adheres to the edge of the outcrop, and the overburden is removed very closely along the seam in much smaller and custom shaped excavations fairly than long strips.

Open-Pit Mining

Open-pit mining is similar to strip mining, except the ore is eliminated from an open up pit i beg your pardon is no then to fill in. Open-pit mining has been approximately for centuries, with ancient cultures choose the Greeks, Romans, and also Persians mining for granite, marble and also even salt.

Open-pit mines are generally called quarries as soon as they create materials supplied in building: limestone, granite, and also marble, for example.

These pit mines proceed to be enlarged until there is no much more ore to mine or the overburden becomes too heavy. When it’s no longer economical to operate an open-pit mine, it’s commonly converted to a landfill or waste disposal site.

The pros of an open pit mine is the these mines usually produce a large amount of ore without the costly process of remove overburden — the ore is often in a huge area and also close to the surface. However, a major con the these form of mines is the they room both danger to job-related in, and also permanently alter the neighboring ecosystem.

*

Mountaintop Removal

Mountaintop remove Mining is highly controversial, and also best suited for retrieving mass quantities of minerals, typically coal, from hill peaks. The procedure involves blasting the overburden v explosives over the mineral seam to it is in mined. The damaged mountaintop is then shifted into valleys and fills below.

This type of mining is offered when the ore to be retrieved is 400 feet or deeper. Debate surrounds the permanent alteration of ecosystems and entire landscapes by removing mountaintops, however, advocates suggest out the after perfect the mining process leaves a flat terrain where there no one as soon as reclamation is complete.

Dredging

Dredging is the an ext sophisticated version of panning for gold. In fact, the mostly connected with gold mining. Lot like hopeful miners with their pans throughout the gold rush, floating dredges (a barge fitted through conveyor belts and scoops) relocate up a water table. A scoop lifts material up on a conveyor belt, and also the mineral is eliminated on board the barge. The unwanted material is climate dropped earlier into the water table using another conveyor belt.

*

Highwall Mining

Highwall mining depends on machinery to collect ores indigenous a “highwall”, or one unmined wall surface with overburden and exposed minerals and also ores. Usually, highwalls are found at the edge of quarries and also pit mines, and permit miners to retrieve ore indigenous a wall surface that would otherwise be also expensive to clear of overburden in order to with the ore. It’s additionally used in contour piece mines come retrieve added ore from the mineral seam above the produced terrace.

See more: What Is The 2007 Honda Accord Lug Nut Torque Specs For Honda Accord Lug Nuts

An expensive and also remotely controlled highwall mining machine excavates in a chop square from the face, using consistent drilling. Conveyor belts and also pulleys relocate the matter from the drill through the device and the leftover matter is deposited behind the drill.