BAUER Mining Solutions · PDF filewith a diameter of 2,5 m to a depth of 60 m in kimberlite...

BAUER Mining Solutions

905-733-2_8-15_Mining.qxd 10.08.2015 13:24 Uhr Seite 1

Rotary drilling rig BG 36 drills holeswith a diameter of 2,5 m to a depth of60 m in kimberlite pipes (Australia)

BAUER Maschinen GmbH is theleading company in developing andmanufacturing of specializedfoundation equipment. Based on theirexperience, BAUER Mining Solutions isactively involved in major mining andexploration projects world wide sincemany years.

BAUER Mining Solutions offersequipment and systems in the followingfields: • Onshore exploration• Offshore exploration• Bulk Sampling• Groundwater control• Cut-off systems• Mine development• Mining systems

In addition to our standard equipment,we are designing new, custom madesolutions together with our clients forspecial challenges, based on ourproven components.

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© BAUER Maschinen GmbH, 8/2015

BAUER Mining Solutions for Exploration and Mining


Mineral Exploration is the process toidentify ore bodies in the earth’s crustand to determine the distribution ofminerals and it’s commercially viableconcentration.

Our daughter company PRAKLA

Bohrtechnik provides drilling rigs fordrilling diameters of up to 1000 mm. RBrigs are mainly used for sampling andcoring to a depth of 500 m and more.To accurately investigate rock sequences– for which the recovery of drill cores isnecessary – rotary wireline core drilling

Exploration activity is conducted inbrownfield areas (an area wherethere is current or past mining of aparticular resource) as well as ingreenfield areas (an area where thereare no current mining operations orknown mineral resources).

Methods for exploration can bedivided into:• Drilling core samples that intersect

a mineral deposit• Bulk Sampling• Sea floor exploration

RB 40 kimberlite RC sampling andcoring in Angola

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Exploration

Exploration Drilling Core Samples

with a double tube core barrel is applied.The most common borehole diameter is146 mm with a core diameter of 101 mm.To perform core drilling with thesedimensions rotary power swivels areneeded that can achieve speeds of up to240 rpm.


BG 48 kelly rig, drilling in theMegalodon alluvial depositin Kleinzee area, South Africaborehole diameter 2,5 m and max. depth 140 m

Bauer rotary drilling rigs BG

and hydraulic grabs DHG

They are excellent tools for theexploration industry. The capacity offorming holes with diameters up to 3 m and depth to 100 m even invery hard ground conditions makes themideal for bulk sampling. The holes caneither be cased or for greater depthsstabilized by drilling mud.

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Exploration Bulk Sampling

“Bulk sampling” is a commonly usedindustry term to describe the practiceof the removal of relatively largequantities of a mineral bearingsubstance for the purpose of testingmineral content. Bulk samplinglocations are selected at random withthe necessity of using mobile butpowerful equipment which is capableof fast and easy self-travelling betweensampling locations and extracting up toseveral hundred tons of ore at onesampling position. Equipment, whichoriginates from the foundationbusiness, are excellent tools for thispurpose.

Typical examples of equipment whichis normally used for constructing boredpiles or diaphragm walls are:• Rotary drilling rigs with kellybar

system. (intermittent dry or slurrysupported process)

• Rotary drilling rigs with RCDattachment (continuous reversecirculation drilling)

• Hydraulically operated and wire-ropesuspended grabs (intermittent dry orslurry supported process)


GB 50 base carrier with ahydraulically operated grab,drilling pocket beachesalong the Atlantic Ocean in Namibia

Crawler crane MC 64

with grab DHG

Rotary drilling rig BG 36 RC

for the sampling of deepkimberlites in Saskatoon,Canada with diameter of 1200mm to a depth of 360 m.Installation of long top casingwith oscillator to 40 m andkelly bar drilling to 100 m. Thereafter drilling system ischanged over to RC drilling.The unit is derived from thestandard Bauer BG series.

Reverse circulation drilling rigs

Reverse circulation drillingwith Bauer BBA 100 in anopen pit mine, Germany

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Bulk sampling of mine dumpsis an ideal application for theBG 36 kelly drilling rig

2,5 m diameter sample holesin Kimberley, South Africa


Sea floor bulk sampling

Bauer Maschinen offers sea floor bulksampling for diamonds with trench cuttertechnology.Over 4000 samples were extracted fromthe seabed to a depth of 5 m and 200 mbelow sea waterlevel off the coast ofNamibia by a sampling tool designed forBHPB.

MeBo

MeBo is a seafloor core drilling rig,working in water depth up to 4000 m. It isdeployed on the seabed, is electricallypowered and remotely controlled from thevessel via umbilical (survey by camerasand sensors). Four foldable legs providefor safe landing and verticality on theseafloor. The MeBo stores drilling rods, casingtubes and rotary barrels on two rotatingmagazines. Depending on the drillingsystem and coring diameter, the MeBohas a capacity to drill up to 200 m into theseafloor, to recover cores of 74 to 101 mmdiameter. Multiple cores can be stored inthe rod magazine to the total maximumcapacity. The preferred samplingmethods are push coring (soft sediments)and rotary drilling (wire line coring) forrock and sediments. Other methods likeCPT or vibro coring are optional. MeBo was originally developed in co-operation with the Marum Centre forMarine Environmental Sciences(University of Bremen).

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Exploration Sea Floor Exploration


Bauer Maschinen offers machinery for working steps which are associated with mine development, such as• Blast hole drills • Drill rigs for additional exploration • Trench cutter technology for mining• Costumized solutions• Machinery for the control of ground

water.

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Mine Development


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Mine Development Mining

Kimberlite dyke (Sierra Leone)

Mining with trench cutter

technology

The well-proven trench cutter technologyof Bauer – which is normally used forconstructing underground walls – canalso be used for special mining activities.A good example is the introduction of thesystem in a diamond mine in SierraLeone. There are areas where kimberliteis present in narrow but long and deepveins within granitic base rock. With thetrench cutter technology it is possible toexcavate the kimberlite dykes without theneed of large scale rock excavation.

Sandstone

Uranium “Hotspots”

Canadian shield (granite/gneiss)

100 – 300 m

Inserted in a pre-drilled and fully casedborehole, the system uses a 3-phasewater jet with a pressure feed of up to600 bars to loosen the ore in the targetdepth of 150 to 180 m and the reversecirculation technology to feed into adewatering system.The system is a viable, special andcustomized solution whenever themineral deposits are too small to bemined with an open pit or withunderground operation.

Special systems for mining

For its Mclean Lake project, AREVAResources Canada Ltd. addressedBAUER Maschinen GmbH for thedevelopment and manufacture of analternative mining method for small,pocket-shaped high grade uraniumdeposits, embedded in sandstone.BAUER Maschinen GmbH designed andmanufactured a system to mine theuranium ore: the High Pressure ReverseCirculation (HPRC) system in closecooperation with AREVA ResourcesCanada Ltd. and BAUER Resources.


Blast hole rigs

Our daughter company HAUSHERR fromGermany is specialist for offering fullranges of blast hole drill rigs in varioussizes and versions for drilling diametersfrom 3 to approx. 9 inch. Machines of theHBM-Series can be used for rotary and /or DTH drilling, whereas machines of HSBseries are exclusively for DTH drilling. Awide range of options allow a high gradecustomizing of the rigs, which are used inblast hole and exploratory drilling in allkinds of open cast mining. Each rig hason-board compressor (high or lowpressure), a rod magazine and a safetycomfort operator cabin (ROPS / FOPS).All rigs are powered by CATERPILLARdiesel engines with sufficient powerreserves. If required some of the modelscan be installed on a wheeled chassisinstead of a crawler or / and with a 90°slew ring. The service free hydraulic rodhandling magazine operates withoutsensor technology. Depending on themachine type, the usable length of therods vary from 3 to 11 meters. All rigs aredistinguished by their excellentaccessibility, their long service life and bytheir simple and robust technology.

Perforation Cutter

In combination with floating clamshellmining e.g. for gravel, the PerforationCutter supports the clamshell operationin dense or hard layers, where even ahydraulic clamshell cannot penetrateeffectively. The BAUER cutter technologyis applied to perforate the hard layers toprovide access to the jaws of theclamshell, thus allowing excavation ofthese layers and further production.

Customized solutions

Many problems in mining can be solved when finding new and economicsolutions. Based on the world wide experience over many years in designing andconstructing of specialized foundation equipment, it is the strategy of BauerMaschinen to design new customized solutions and machinery for solvingproblems in a new way. Such an approach will always be made in closecooperation with the customer with incorporating their ideas and wishes.

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Cut-off wall

Cut-off wall systems are ideally suited aswater barriers around excavation pits,mining pits or similar. A variety of cut-offsystems is available for almost each typeof soil and site condition, for temporary orfor permanent use. Cut-off walls areconstructed with techniques of thespecialist foundation industry like trenchcutters, slurry wall grabs or soil-mixingtechniques. Wall material ranges fromplastic concrete, standard concrete to in-situ mixed soil-cement material.

Baserig

Cutter

Guide andairlift pipe

Discharge pipe

Barri

erpa

nels

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Mine Development Water Control in Open Mining

A huge cut-off wall on the DIAVIK Diamond

Mine in Canada serves as an impressiveexample for a complicated cut-off wall. The kimberlite pipes were sealed off with dikes and cut-off walls installed with BAUERequipment and technical support. More than40.000 m2 had to be sealed in water depths upto 25 m under extremely harsh conditions.

Continuous cut-off wall

For sealing off big lignite open pits inGermany, the energy company Vattenfallcreated a system of a continuous cut-offwall. The soil is excavated with a specialcutter – designed and supplied by BauerMaschinen. The excavated soil, mixed with clay slurryis pumped into the continuous trenchbehind the cutter. After sedimentation, animpervious clay crust is formed on bothsides of the trench.


PRAKLA RB 40

For many operations slurry is requiredfor stabilizing holes or as transportmedium for cuttings.

Slurry mixers are essentialcomponents when constructingboreholes, wells or cut-off walls. MAT mixers are capable ofmixing bentonite slurries,cement slurries or bentonite-cement slurries. They can beprovided as fully automatic andelectronically controlled units, or as manually operated batchmixers, especially suitable inremote areas.

Slurry desanding plant BE 500(capacity 500 m3/h) at DIAVIK, Canada

Desanding plant and kimberlite recovery system BEK 375

Automatic slurry mixing system SCC 40in Kleinzee, South Africa

PRAKLA RB-T 100

Well drilling

A standard method for groundwatercontrol is the installation of wells. Wellsare constructed around and inside openpits to allow for dry mining. Incombination with cut-off walls deep wellsare installed inside the pit for dewateringand to keep the water table below mininglevel at all time. Our daughter companies PRAKLABohrtechnik as well as BAUER-DEWETprovide drill rigs for drilling water wells upto 1000 mm diameter with a hook loadcapacity of up to 100 tons.

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Slurry Mixing and Recovery Plants


Desanding and separation units

are required when working withreverse circulation methods (welldrilling, wall construction with BCcutters) to separate soil cuttings outof the slurry backflow.A variety of systems is availabledepending on the particle size of thecuttings and the volume stream to becleaned. Bauer BE desanders can treatvolume streams from 50 – 1000 m3/h.


905.733.2 8/2015

Design developments and process improvements may require the specification and materials to be updated and changed without priornotice or liability. Illustrations may include optional equipment and not show all possible configurations.These and the technical data are provided as indicative information only, with any errors and misprints reserved.

bma.bauer.de

BAUER Maschinen GmbHBAUER-Strasse 186529 SchrobenhausenGermanyTel. +49 82 52 [email protected]


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