Cobar 1400 Yumlu Mining With Paste Fill

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Mining with Paste Fill

Mehmet Yumlu, Principal Mining Engineer

AMC Consultants Pty Ltd

AusIMM Cobar Mining Seminar

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6 August 2010

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IOutline

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n ro uc on

What is Paste Fill?

Why Using Paste Fill?

Paste Fill System Design

Paste Fill Making Process

Distribution and placement

Mining with Paste Fill - Case Studies

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IWhy Paste fi ll?

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eng neere pro uc cons s en g qua y

suitable for most mining methods - versatile

lower cost for a given exposure duty - economic

reduces surface footprint - environment friendly

allows extraction of ore pillars - increasing resource extraction

allows effective local and regional ground support - safety

fast filling rates enables shorter stope cycle times - productivity

non se re atin - reduced dilution

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IWhat are Paste Fil l Duties in UG Mining?

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en n egra e n o e m n ng cyc e pas e ac serves

as a working platform,

as an engineered artificial back

provides confinement to ore pillars and the host rock, and

revents unravellin thereb limitin conver ence and subsidence into the mine

voids.

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ISome Myths.

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as e s

The solution to all future mine fill problems

A fill type by which all the water is absorbed through cement hydration

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IPaste Fil l Design

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Flow properties (rheology)

deliver of aste from surface to under round via boreholes and i es at the hi hest ractical

pulp density

Strength properties

pas e o rema n s a e w en expose o s a c or ynam c oa ng con ons exper ence y

the mining operation

This includes short term during the local mining operation and

Long term stability against regional seismicity

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IStrength Design

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na y ca

Empirical

Numerical

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IRheology Design

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eo ogy s e s u y o e ow proper es o u s

Water is a Newtonian fluid If you tip water out of a glass it will start to flow immediately

Pastefill is a non-Newtonian fluid

If you want to get toothpaste out of the tube, you must squeeze it first

Yield stress is the measure of how much work is required for the paste to start

flowing

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ITypical Paste Fill Characteristics

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ar c e s ze s r u on

Minimum 15% passing 20 micron

No to size

Rheological properties

Yield stress for surface disposal less than 100 Pa

Yield stress for backfill 100 to 700 Pa

Strength properties

Stiffness, E=150 to 450 MPa

Can be engineered to desired strength ( 100 kPa to 5 MPa)

sultantsPtyLtd Typical strength values (UCS)

300 to 1,000 kPa for vertical exposures

>1,000 kPa for undercut exposures

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IWhat are methods of making paste fi ll?

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IWhat are the delivery options?

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Gravity delivery to borehole

Surface conveyor to borehole

Pum deliver thru

Borehole

Decline

Agi truck delivery to borehole

Internal boreholes

Level pipelines

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IPaste Fill Operations Increasing Popularity

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ou opera ons wor w e

Many ongoing projects

Canada = 35 / 2

Australia = 24 / 5

South America = 12 /4

Europe = 11 /8

Asia = 7 / 9

Africa = 5 /1

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ICase Study 1

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Online paste fill plant, 45 m3/hour

Using full tailings, SG of 4.5

PSD (50-60% passing 20 microns with P80 of 63 microns)

Solid density 82%w/w (49.5%v/v)

Slump: 7 10 inch

Paste bulk and dry density: 2.6 and 2.0 tonnes/m3

Stope size 20m H x 7m W x 30m L (panels)

Target design strength: 1.0 MPa

GP cement; 7% 150 k /m3 for rimaries and 5% 110k /m3 for secondaries

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Pump delivery, 125 mm diameter thru decline and boreholes

Shotcrete barricades

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ICase Study 1

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ICase Study 2

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n ergroun go m ne

Production 450 TPA Mining method

Underhand cut and fill

Backfill types Paste fill

Rockfill

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ICase Study 2

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ry pas e sys em, m our

Using volcanic tuff

- m cron, m cron , o .

Solids density 50%w/w (28%v/v)

Wet and dry bulk density 1.5 t/m3 and 0.8 t/m3

GP cement; 15 to 20%w/w (100 to 150 kg/m3)

Target design UCS >1,500 kPa

Stope size 5m W x 5m H x 30m L (cells)

sultantsPtyLtd Shotcrete barricade

Gravity delivery thru borehole, 150mm dia distribution system

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ICase Study 3

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n ergroun n an m ne

Production 1.6 MTPA

Tabular flat dipping massive sulphide orebody (dip


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ICase Study 3

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n ne pas e p an us ng , m our

Full mill tailings (35% passing 20 micron, P80 100 micron), SG of 3.6

o s ens y w w v v

Wet and dry bulk density 2.15 t/m3 and 1.6 t/m3

Yield stress 50 to 100 Pa (10 to 10.5 inch slump)

Pump delivery through decline, 200 mm diameter, 3.5 km long

Shotcrete barricades

Stope size 10m W x 6m H x 150m L

sultantsPtyLtd Target design UCS 500 kPa, @7% cement (100 kg/m3)

Slag 60% : cement 40%

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ICase Study 3

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IThank you for listening

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ny ques ons

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266 August 2010

Cobar 1400 Yumlu Mining With Paste Fill

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Transcript of Cobar 1400 Yumlu Mining With Paste Fill