sampling 1.ppt

8/14/2019 SAMPLING 1.ppt

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A Generation For Correct Mining

Sample Quantity

Sampling Accuracy

Sample Treatment

Sampling Conditions

Types Of Samples

Sample Definition

CONTENTS


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SAMPLING

SAMPLING IS T! MOST

!SS!NTIAL PA"T O# T!

"A$ MAT!"IALIN%!STIGATIONS


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SAMPLING ACCURACY

SAMPLING ACC&"AC'

(ASICALL' CONT"OLLING T!

!NTI"! %ALIDIT' O# T!

CONCL&SIONS O# T!

IN%!STIGATION


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SAMPLES

Samples

Are T)e (asic Tools &sed In "a* Material

!+ploration

Samples

Must (e Truly "epresentati,e T)e Or Deposit


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SAMPLES

Sample Is Analy-ed To Determine . Nature

Composition

Percentage Of Specified Constituents

Sample Is A "epresentati,e #raction Of A (ody Of

Material .Collected (y Appro,ed Met)odGuarded Against Alteration


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Sampling conditions

Samples So!ld "e #

Co,er t)e Se/uence &nder In,estigation

Ta0en #rom &n1*eat)ered "oc0 2#res) "oc0$

Ta0en from "egular Inter,al


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Sampling conditions

In Cases $)ere t)e Num3er of Samples

Is Limited 4 t)e Sampling Locations

S)ould(e Spread Out in Order to Get

t)e Ma+imum Amount of Information5s


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Sampling conditions

In Cases of eterogeneous Deposits4

Samples of Certain !ntity Can (e

Grouped to #orm a Composite Sample


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Sampling conditions

Sampling Locations Must(e Plotted

on Maps 4 Sections or S0etc)es and

Descri3ed #ully in t)e Notes


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Topographic map


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Geologic map


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Sampling Conditions

T)e Source and Sample Num3er Must

(e P)ysically Mar0ed in t)e #ield for

Possi3le "e1sampling


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Sampling conditions

Sample Must (e:

Placed in $ater Proof or Dustproof or Containers6

Clearly La3eled *it) Sample NO64 "oc0 Type and Date


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T%pes o& samples

(ul0 or Gra3 Samples

Spot or Surface Samples

C)annel Samples

Core Samples


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S!r&ace.1

76 Manual

86 Trenc)


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Surface samples


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9

:

79

7:

89

8:

;9

O"

LIMESTONE

MARL

CLAY

MARL

SAN'

CLAY

Spot Cannel Cannel

T%pes o& samples


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Undergro!nd. Core 'rilling


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Core drilling methods Con,entional

7 Tu3e

8 Tu3es

; Tu3es

!,ery drilling run. ta0e all t)e tu3es out of t)e

)ole4 reco,er t)e core and re1introduce all t)e

drilling column6 Drilling 3ars6

$ireline. Only an internal accessory4 loaded *it)t)e core4 is lifted inside t)e drilling tu3es


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Example of drill hole with its chemistry


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Undergro!nd. destructi,e drilling


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Sampling# Introd!ction

P!rpose# to maintain (!alit% control o& an%

part o& te process)

Te relia*ilit% o& a sample# de+iation

*et,een te grade o& te sample and te

tr!e grade o& te lot-)

E.pected de+iation

/ F!ndamental Sampling Error 0FSE$1


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Te t,o golden r!les o& sampling

Collect te Minim!m Representati+e

2eigt)

Allo, e+er% particle te same cance

o& *eing collected1


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"Sampling Introduction

@ T)e purpose of sampling is to maintain /uality control of any part of t)e

process 2in t)e /uarry4 3efore or after crus)er4 grinder4 pre1)omo4 silos4

0iln4 etc6 So e,ery3ody s)ould 3e directly concerned 3y t)is part of

t)e course6

@ Sampling is remo,ing a part of t)e material of interest to produce useful

information6

@ $e discuss sampling t)eory 3ecause t)e grade of t)e sample is not

e+actly e/ual to t)e true grade of t)e lot6


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"Sampling Introduction

@ As0 t)e /uestion . According to your e+perience. *)at are t)e main

factors influencing t)e relia3ility of a sample B

@ Possi3le ans*ers.

1 si-e 2mass of t)e sample4 for small lot4 mass of t)e lot1 si-e of t)e roc0 particle1 t)e nature of t)e particle1 t)e grade of t)e lot1 state of segregation6

@ $e *ant to understand and minimi-e eac) source of sampling errors6

T)ese errors can 3e minimi-e 3y using good sampling de,ices and 3y

controlling a series of p)ysical parameters66


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3eterogeneit%

T,o t%pes o& eterogeneit%#

45 Constit!tion 3eterogeneit%#

depends on te di&&erence o&

grade *et,een &ragments-

65 'istri*!tion 3eterogeneit%#depends on te arrangement

o& particles in te lot1


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"Heterogeneity"

(ot) types of )eterogeneity increase t)e sampling difficulties6

$e )a,e seen 3efore t)at a good sampling de,ice must allo* e,ery

particle t)e same c)ance of 3eing collected6

As0 t)e /uestion to t)e audience. Could you find some reasons *)y t)is

condition *ould not 3e respectedB@ Possi3le ans*ers.s)ape of t)e lot 2a pile for e+amplesegregationsampler

a sampler *)ic) fa,ours a part of t)e pile or a group of particles6

@ Example of segregation:particle si-e. small particles mo,e do*n*ardparticle density. dense particles also mo,e do*n*ard.


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"Sampling of Stockpiles"

@!+amples of stoc0piles.

Left. sampling iron o+ide from stoc0pile

"ig)t. ra* materials in a storage )all6

@A pile is ,ery difficult to sample.Cannot allo* e,ery particle t)e same c)ance of 3eing collected

Cannot ta0e into account t)e segregation of particles6

@A good sampling de,ice and t)e sampling of small 8D and 7D lot *ill

minimi-e t)e distri3ution )eterogeneity6 $e *ill )a,e to deal only *it) t)econstitution )eterogeneity6


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Sampling o& Stoc7piles

Sampling iron o+ide from stoc0pile "a* materials in storage )all


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Ma.im!m Minim!m (!antit%

grain si8e 0mm$ o& te sample 07g$

499199 499199

:9199 ;9199

9199 4=199

69199 49199

49199 >199

;1=9 6199=199 4199

>199 91=9

6199 91>9

4199 9149

Samplingquantity & grain size


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Sampling quantity & grain size

4

49

499

499

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