This mine is an open pit mine producing 5 000 tonnes ore and 5 000 tonnes waste per day Rock characteristics for both ore and waste are typical of those of granite or porphyritic material Operating conditions wage scales and unit prices are typical for western U S mining operations All costs listed are in 2012 US$ The key design criteria Selective mining methods Cut and fill mining is a method of short-hole mining used in steeply dipping or irregular ore zones in particular where the hanging wall limits the use of long-hole methods The ore is mined in horizontal or slightly inclined slices and then filled with waste rock sand or tailings

Open

Open-pit mining methods are applicable to mining ore deposits that apex at or near the surface If the deposit apexes below the surface the overburden and barren capping overlying the ore must be removed in advance of open-pit mining The removal of this material is known as stripping The stripping-pit limits must be extended beyond the limits of the ore pit to provide a bench

The majority of open pit mines in Australia currently operate using discontinuous shovel/truck systems These systems are favoured as they enable (i) mining capacity to be progressively scaled up over the life of a mine (ii) the use of narrow benches that defer the high costs of stripping and (iii) flexibility to rapidly adapt mine plans in the face of uncertainties caused by

Open pit mines can be used in coal mining and they are used extensively in hard rock mining for ores such as metal ores copper gold iron aluminum and many minerals In a open pit coal mine the pit bottom would be the bottom mined coal seam elevation since it is usually feasible to extract multiple seams when surface mining coal

Mar 13 2012What is Opencast Mining• Opencast mining is also known as Open pit mining Open cut Mining Surface or Strip Mining • The coal upto economical depth will be excavated by OC Method • The current operating depth of OC mines in SCCL is about 200m and SCCL proposed to operate OC mines upto a depth of 420m

It is used for ores like tin coal gold and diamonds and derives its name from the equipment used called 'dredge' (a kind of floating excavator) These surface mining methods are considered to be more efficient and economical in extracting minerals as compared to most methods of underground mining In fact it can extract almost 90% of

Open Cut Coal

02 | OPEN CUT COAL RPMGlobal's (RPM) expertise spans across all key mining regions methods and commodities globally RPM partners with Mining clients and Investment firms to deliver bespoke and/or independent insights and advice based on our strong understanding of the requirements of the mining industry and its financiers

When coal seams are near the surface it may be economical to extract the coal using open cut (also referred to as open cast open pit mountaintop removal or strip) mining methods Opencast coal mining recovers a greater proportion of the coal deposit than underground methods as more of the coal seams in the strata may be exploited

Open-pit mining is much safer than shaft mining In underground mining the threat of a cave-in or release of toxic gas is a constant concern When shaft mining was the most common method of ore extraction thousands died in cave-ins gas events and accidents involving equipment In 1907 alone more than 3 200 deaths related to mining occurred

PBE requires much lower capital investment than other mining methods and is a high productivity system with much lower mining costs than other methods PBE is therefore vastly superior in overall outcomes to all open cut mining and other U/G mining methods PBE will make mining safe low cost to develop and mine – it will reduce GHG

It is used for ores like tin coal gold and diamonds and derives its name from the equipment used called 'dredge' (a kind of floating excavator) These surface mining methods are considered to be more efficient and economical in extracting minerals as compared to most methods of underground mining In fact it can extract almost 90% of

There are different methods of mountaintop removal coal mining including the box-cut method steep-slope method cross-ridge method and a few others Mountaintop removal involves several steps as described below The vegetation and topsoil of the mountaintop are removed first The trees are then destroyed usually by burning or some other

Tarrawonga is an open-cut mine situated in New South Wales Australia and is a venture between Whitehaven Coal and Idemitsu The Tarrawonga mine is expected to produce up to 1 5 million tonnes per year of low-ash low-sulphur thermal coal via open-cut methods over the next eight to

Coal is mined by conventional open cut strip mining methods Mining generally progresses from west to east with mining of the Elphinstone Seam preceding mining of the underlying Hynds Seam The deeper Fort Cooper Seam is also periodically mined in areas where it is close to the Hynds Seam subject to production schedule constraints

Open Cut and Underground Mining

Underground Mining Underground Mining is generally used for areas where the mineral seam is too far underground for open cut mining to be of use A tunnel called a decline is created to allow workers and machinery to reach the location of the minerals Stope mining is used for most hard rock mining of minerals such as copper silver lead

Volume Calculations (Open-cut Mine Surveying Duties) Volume calculations are very important in mining to not only estimate the efficiency of machines and mining methods but also to determine how much contractors should be paid if they are paid on a material-moved basis

Mar 13 2012What is Opencast Mining• Opencast mining is also known as Open pit mining Open cut Mining Surface or Strip Mining • The coal upto economical depth will be excavated by OC Method • The current operating depth of OC mines in SCCL is about 200m and SCCL proposed to operate OC mines upto a depth of 420m

02 | OPEN CUT COAL RPMGlobal's (RPM) expertise spans across all key mining regions methods and commodities globally RPM partners with Mining clients and Investment firms to deliver bespoke and/or independent insights and advice based on our strong understanding of the requirements of the mining industry and its financiers

designed for coal mining 4 Two Basic Methods of Coal Extractions 5 Surface Mining Surface mining (also commonly called strip mining though this is actually only one possible form of surface mining) is a type of mining in which soil and rock overlying the mineral deposit (the overburden) are removed It is the opposite

Highwall mining is used in open-cut coal mining operations with a continuous mining machine and a modular conveyor train being remotely driven into the exposed coal seam at the base of an open-cut highwall The extraction process creates multiple tunnels that can extend over 500m with supporting coal pillars left in between

When coal seams are near the surface it may be economical to extract the coal using open cut (also referred to as open cast open pit mountaintop removal or strip) mining methods Opencast coal mining recovers a greater proportion of the coal deposit than underground methods as more of the coal seams in the strata may be exploited

Coal is mined by conventional open cut strip mining methods Mining generally progresses from west to east with mining of the Elphinstone Seam preceding mining of the underlying Hynds Seam The deeper Fort Cooper Seam is also periodically mined in areas where it is close to the Hynds Seam subject to production schedule constraints