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«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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“ECONOMIC AND TECHNICAL CRITERIA IN THE SELECTION OF A TAILINGS DAM”
SUBJECT :
MINERAL ECONOMICS AND VALUATION OF MINES.
MEMBERS: GIANFRANCO LÓPEZ REQUELME HUGO DEUDOR BENAVENTE JEAN CRUZ RIVAS RENZO TEJADA HERRERA RONALD ROJAS GUERRERO VICTOR JUAREZ RACCHUMI
PROFESSOR :
ROBERTO MALDONADO ASTORGA
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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INDEX:
I. OBJECTIVESII. INTRODUCTIONIII. MATRIXIV. APPLICATIONV. DISPOSAL METHOD SELECTIONVI. CONCLUSIONSVII. BIBLIOGRAPHY
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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I. OBJECTIVESGENERAL:
To develop a methodology for selecting the best option of a tailings dam.
SPECIFICS:
Using a decision matrix in the selection of Tailing Pond with technical and economic criteria.
Show the most important scaling parameters to be taken into account in a tailings pond.
Allow tailings ponds are friendly to the environment.
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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II. INTRODUCTION
«TAILINGS POND»
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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III. DECISION MATRIX
Maximize the stability of the deposit - 22%
Minimize the volume of wall fillings - 18%
Optimizing the use of the
tributary basin – 15%
Minimize infiltration to
groundwater – 5%
To minimize transportation costs tailings
site - 18%
minimize the negative public
perception – 22%
DECISION MATRIX
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
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MAXIMIZE THE STABILITY OF THE DEPOSIT - 22%
ANALYSIS OF STABILITY OF STRUCTURE
Stability against liquefaction
Stability against overflow
Stability against internal erosion
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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MINIMIZE THE VOLUME OF WALL FILLINGS - 18%
Important criteria to ensure the economic feasibility of the disposal system.
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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OPTIMIZING THE USE OF THE TRIBUTARY BASIN – 15%
Increase in capital Increase operating costs
Environmental management.
WE SHOULD
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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MINIMIZE INFILTRATION TO GROUNDWATER – 5%
EFFECTS
Ground water pollution.
Biodiversity damage.
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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TO MINIMIZE TRANSPORTATION COSTS TAILINGS SITE - 18%
KEY PARAMETERS
Tailings volume to transport
Process plant to tailings dam distance
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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MINIMIZE THE NEGATIVE PUBLIC PERCEPTION – 22%Main criteria due to the current sensitivity and the negative predisposition of the population to deposits Tailings.
Sinaycocha Tailings Ponds
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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IV. APPLICATION
• Name of the project : UNI 2016 • Surface mining operation producing copper• Daily production of tailings : 80000 tons.• Life of mine (LOM): 20 years• Production of tailings : 400 Mm3
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
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SITES IDENTIFICATION
UNI 2016 MINE
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«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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PRELIMINARY SELECTION STAGE
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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PRE - SELECTED SITES
SITE VOLUME OF DAM (Mm3) DAM HEIGHT (m) LENGTH OF DAM (m)
2 440 15 2200
3 407 200 1670
4 445 220 1245
6 416 130 953
8 402 120 2225
9b 424 210 1174
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
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EVALUATION SUMMARY FOR TAILINGS DISPOSAL SITES
QUALIFICATIONS AND RANKING – CONVENTIONAL DISPOSAL CAS
SITEIMPOUND
MENT STABILITY
(22%)
MINIMIZE NEGATIVE PERCEPTION (22%)
MINIMIZE CONVEYA
NC E COST (18%)
MINIMIZE DAM
VOLUME (18%
MINIMIZE WATER
MANAGE MENT
COSTS (15%)
MINIMIZE SEEPAGE
(5%) WEIGHTED SCORE RANKING
2 3 2 3 3 3 3 2.78 4°
3 3 2 4 3 3 3 2.96 2°
4 3 4 5 3 3 4 3.63 1°
6 2 4 3 1 4 3 2.79 3°
8 2 3 1 4 3 2 2.55 6°
9b 2 4 1 5 2 3 2.85 5°
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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SENSITIVITY ANALYSIS: LOCATION OF PLANT NON-RELEVANT FOR TAILINGS IMPOUNDMENT LOCATION QUALIFICATIONS AND RANKING – CONVENTIONAL DISPOSAL WITHOUT CONVEYANCE
COST
SiteImpound
ment Stability
(27%)
Minimize negative perception (27%)
Minimize conveyanc e cost (0 %)
Minimize dam
volume (22 %
Minimize water
manage ment costs (18%)
Minimize seepage
(6%) Weighted
Score Ranking
2 3 2 3 3 3 3 2.73 5°
3 3 2 4 3 3 3 2.73 5°
4 3 4 5 3 3 4 3.11 1°
6 2 4 3 1 4 3 2.96 3°
8 2 3 1 4 3 2 2.89 4°
9b 2 4 1 5 2 3 3.04 2°
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
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SENSITIVITY ANALYSIS: INCREASING RELATIVE IMPORTANCE OF THE PERMITS AND REGULATORY ASPECTS QUALIFICATION AND RANKING – CONVENTIONAL DISPOSAL WITH MORE IMPORTANCE
TO REGULATORY ASPECTS
SiteImpound
ment Stability
(22%)
Minimize negative perception (22%)
Minimize conveyanc e cost (5 %)
Minimize dam
volume (5 %
Minimize water
manage ment
costs (23 %)
Minimize seepage (23%)
Weighted Score Ranking
2 3 2 3 3 3 3 2.78 4°
3 3 2 4 3 3 3 2.83 3°
4 3 4 5 3 3 4 3.50 1°
6 2 4 3 1 4 3 3.18 2°
8 2 3 1 4 3 2 2.50 6°
9b 2 4 1 5 2 3 2.72 5°
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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SENSITIVITY ANALYSIS: SENSITIVITY: INCREASING RELATIVE IMPORTANCE OF COSTS
QUALIFICATIONS AND RANKING – CONVENTIONAL DISPOSAL WITH MORE IMPORTANCE TO COSTS
SiteImpound
ment Stability
(20%)
Minimize negative perception (20%)
Minimize conveyanc e cost (25%)
Minimize dam
volume (25 %
Minimize water
manage ment
costs (5 %)
Minimize seepage
(5%) Weighted
Score Ranking
2 3 2 3 3 3 3 2.80 4°
3 3 2 4 3 3 3 3.05 2°
4 3 4 5 3 3 4 3.50 1°
6 2 4 3 1 4 3 2.80 3°
8 2 3 1 4 3 2 2.50 6°
9b 2 4 1 5 2 3 2.70 5°
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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V. DISPOSAL METHOD SELECTION: CONVENTIONAL OR THICKENED
Advantages of the thickened tailings method:• Greater water recovery in the thickeners, which in the
case for site 4,would be located relatively close to the concentrator.
• Lower tailings water seepage into the subsurface water tables.
• Lower closure costs of the tailings facility.
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
«PROFESSIONAL ENGINEERING SCHOOL OF MINES»
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DISPOSAL METHOD SELECTION: CONVENTIONAL OR THICKENED
Disadvantages of the thickened tailings method:• The operational costs of a thickened tailings
impoundment are relatively high. • The technologies for tailings thickening and
conveyance for concentrations greater than 65% and with production rates of 80 ktpd are relatively new and have not been proven.
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
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VI. CONCLUSIONS
• The main tool used for choosing the tailings dam was the decision matrix.
• Applying the decision matrix, you can know that the most suitable alternative to deposit tailings is the site 4.
• Choosing a tailings deposit must be done from a technical, economical and ecological aproach.
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VII. BIBLIOGRAPHY
• Servicio Nacional de Geología y Minería. (2003). CONSTRUCCIÓN Y OPERACIÓN DE TRANQUES DE RELAVES. [online] Available at: http://www.sernageomin.cl/pdf/mineria/ambiente/construccion_operacion_tranques.pdf [Accessed 10 Jun. 2016].
• Cortés Cortés, J. and Dunstan Silva., J. (2008). MODELO DE AUDITORÍA AMBIENTAL PARA TRANQUES DE RELAVE. [online] Available at: http://www1.gorecoquimbo.gob.cl/tesis/descarga/2007/Modelo%20de%20auditoria.pdf [Accessed 10 Jun. 2016].
«NATIONAL UNIVERSITY OF ENGINEERING»«FACULTY OF GEOLOGICAL, MINING AND METALLURGICAL ENGINEERING”
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THANKS FOR YOUR ATTENTION !!!