SAMPLING 1.ppt
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Transcript of 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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A Generation For Correct Mining
SAMPLING
SAMPLING IS T! MOST
!SS!NTIAL PA"T O# T!
"A$ MAT!"IALIN%!STIGATIONS
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A Generation For Correct Mining
SAMPLING ACCURACY
SAMPLING ACC&"AC'
(ASICALL' CONT"OLLING T!
!NTI"! %ALIDIT' O# T!
CONCL&SIONS O# T!
IN%!STIGATION
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A Generation For Correct Mining
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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A Generation For Correct Mining
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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A Generation For Correct Mining
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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A Generation For Correct Mining
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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A Generation For Correct Mining
Sampling conditions
In Cases of eterogeneous Deposits4
Samples of Certain !ntity Can (e
Grouped to #orm a Composite Sample
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A Generation For Correct Mining
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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A Generation For Correct Mining
Topographic map
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A Generation For Correct Mining
Geologic map
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A Generation For Correct Mining
Sampling Conditions
T)e Source and Sample Num3er Must
(e P)ysically Mar0ed in t)e #ield for
Possi3le "e1sampling
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A Generation For Correct Mining
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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A Generation For Correct Mining
T%pes o& samples
(ul0 or Gra3 Samples
Spot or Surface Samples
C)annel Samples
Core Samples
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A Generation For Correct Mining
S!r&ace.1
76 Manual
86 Trenc)
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A Generation For Correct Mining
Surface samples
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A Generation For Correct Mining
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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A Generation For Correct Mining
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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A Generation For Correct Mining
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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A Generation For Correct Mining
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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A Generation For Correct Mining
"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 $e *ill )a,e to deal only *it) t)econstitution )eterogeneity6
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A Generation For Correct Mining
Sampling o& Stoc7piles
Sampling iron o+ide from stoc0pile "a* materials in storage )all
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Ma.im!m Minim!m (!antit%
grain si8e 0mm$ 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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A Generation For Correct Mining
Sampling quantity & grain size
4
49
499
499