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QUALITY ASSURANCE IN THEPROCESS FROM ROCKS TO
CATHODES.Gerencia Funcional Ingeniera y Procesos
Vicepresidencia de Proyectos
Magali Campos B.
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INTRODUCTION
ALONG THE VALUE CHAIN OF THE
MINING BUSINESS, FROM ROCK TOCATHODES, MANY CRITICAL DECISIONARE BASED ON SAMPLES AND ASSAYS
(P. Carrasco et al 2004)
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THE ECONOMIC IMPACT OF CORRECTSAMPLING AND ANALYSIS PRACTICE
SAMPLINGWhat Happened when a Proper Sampling Device wasInstalled in a Tail Discharge?
Before the proper sampling device was installed thecopper tail grade was assumed to be 0,15 %, the realvalue was 0,2%.
The flow rate was 96.000tons/day.
The annual copper losses were 17520 ton/yearConsidering a copper price of 1 dollar/pound
The annual loss is 38.544MUS$
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THE ECONOMIC IMPACT OF CORRECTSAMPLING AND ANALYSIS PRACTICE
ANALYSIS PRACTICE
Some few years ago, Codelco decided to sell
51% of El Abra deposit. Due diligence processencountered assays were biased by - 0,06%Cu in the oxide zone. Because of the hightonnage and low grade of the deposit, impactof analytical bias caused economic loss of
300 MUS$
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QUALITY ASSURANCE
Define standards and procedures of thebest practices to ensure and confirm thequality, robustness and reliability of thegeo/mining/metallurgy base in order toobtain the economic benefits expected by
the project, helping to maximize long-term economic value of the Corporation.
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STANDARD, BEST PRACTICE GUIDESAND ANALYTICAL PROTOCOLS.
FUNDAMENTAL
ERROR
GROUPING &
SEGREGATION
ERROR
DELIMITATION
ERROR
PREPARATION
ERROR
EXTRACTION
ERROR
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IMPLEMENTATION OF SAMPLINGPROTOCOL
CNAM 008
HETEROGENEITY TEST TO DETERMINESAMPLING CONSTANTS ANDNOMOGRAMS FOR SAMPLE
PREPARATION
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SAMPLING CONSTANT
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IMPLEMENTATION OF SAMPLINGPROTOCOL
CNAM - 007
STANDARD CONDITIONS OFSAMPLING STATIONS FOR MATERIALBALANCE AND TRANSFER POINTS OF
PRODUCTS
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SAMPLING METHODS
Manual, not equiprobabilistic Automatic Sampler
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IMPLEMENTATION OF SAMPLINGPROTOCOL
CNAM - 017
QUALITY ASSURANCE INDIAMOND DRILL CUTTING
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IMPLEMENTATION OF SAMPLINGPROTOCOL
CNAM - 011
INGAMELLS TEST
SUB SAMPLING IN A LABORATORY
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Keep the position (X, Y) for everyanalysis and put it into a graphic
Ingamells test
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STATISTICAL ANALYSIS FOR THE TEST
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IMPLEMENTATION OF SAMPLINGPROTOCOL
CNAM - 015
SAMPLING AND CHEMICALANALYSIS OF COPPER CATHODES
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It is necessary to perform experiments to betterunderstand variability within cathodes, betweencathodes, and between processing units.
The correct sampling of copper cathodes is aprofound issue in the copper industry, worldwide.The determination of various impurity contents has
vast economic consequences for the copper cathodeproducers, and especially for the copper cathodeusers. F.Pitard (2002)
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STRATIFIED RANDOM SAMPLING
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PRESERVING SAMPLE INTEGRITY
CNAM - 012
STANDARD CONDITIONS TO FULFILLDURING SUBSAMPLING OPERATIONSAT THE LABORATORY
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PREVENTION OF ANALYTICAL ERROR
CNAM - 009
PREPARATION AND OBTENTION OFREFERENCE MATERIALS
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CERTIFIED VALUES FOR AREFERENCE MATERIAL
When using Atomic Absorption methods orother non absolute methods, the final outcomecorresponds just to a recommended value.
The certified value has to be obtained througha procedure where the result is a valueobtained from direct measurement of a
relevant parameter, traceable to a fundamentalunit in the International Unit System (SI).
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ABSOLUTE METHODMOLYBDENUM ABSOLUTE METHODARSENICABSOLUTE METHODCOPPER
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QUANTIFICATION OF ANALYTICALERROR
CNAM - 010
VERIFICATION OF CHEMICALANALYSIS RESULTS FOR MINERALS
CNAM - 013
QUALITY ASSURANCE IN PREPARATIONOF MINERAL SAMPLES FOR CHEMICAL
ANALYSIS
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Cu A % Cu B % Dif. Cu (A - B) %
PROMEDIO 0,4534 0,4538 -0,0004
VARIANZA 0,240 0,244 0,000092
DESVIACION ESTANDAR 0,490 0,493 0,0068
DATOS 410 410 410
ERROR MEDIO 0,00034
T -1,07
CV % 1,50
% ERROR SESGO -0,08
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WEIGHTING ERROR
CNAM - 014
STANDARD CONDITIONS OFWEIGHTING SYSTEMS FOR CONVEYORBELTS FOR METALLURGICAL BALANCE
AND TRANSFER OF MATERIALS
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CONCLUSION
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CONCLUSION
The application of standards and best practice guides, enablequality assurance of data for resource estimation, grade control,metallurgical balance and commercial transactions.
The Quality Assurance Analytical information is essential for thedevelopment of projects in the copper industry, the correctsampling and analysis practices give a huge benefit because theyeliminate hidden losses and maximize the available resources.
The use of standards help to maximize long-term economic valueof the Corporation, allow the company to maintain excellence ineverything we do and the practice of continuous improvement,makes us a world leader in the copper industry.
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PEDRO CARRASCO MENTOR OF STANDARDS
AND BEST PRACTICE GUIDELINES
Muchas Gracias
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