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• Marcelo Mamani

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MINERA ESCONDIDA

Gerencia de Servicios metalurgicos

Mine Plant Integral Planning and Precrushing

Modelos Predictivos de Velocidad de Sedimentación y % Humedad Residual, para las Plantas (LS – LC) y Tranque de Relave FY04-FY05-08

Mirada al Noroeste

N-12 Bco 3055

N-11 Bco 2920

Proyecto considera 1200 muestras de las cuales hemos analizado 500 aproximadamente

Figura: Vista 3D de la Velocidad de sedimentación para los bancos 2920 y 2650 en el sector de las expansiones N11 y N12

Figura: Vista 3D de los volúmenes con bajo porcentaje de humedad residual.

Tabla: Resumen alimentación FY04, para la velocidad de alimentación

Semana Ene04_S1 Ene04_S2 Ene04_S3 Ene04_S4 Feb04_S1 Feb04_S2 Feb04_S3 Feb04_S4 Mar04_S1 Mar04_S2 Mar04_S3 Mar04_S4 Abril 2004 Mayo 2004 Junio 2004 Total

kTon 2,205,158 1,265,308 1,258,655 786,779 2,331,833 1,619,019 1,574,138 1,161,165 2,789,017 1,759,993 1,348,367 1,850,149 7,549,048 6,210,022 5,457,959 39,166,610

CUT 1.71 1.77 1.64 1.46 1.40 1.72 2.03 1.61 1.52 1.82 1.89 1.93 1.55 1.89 1.89 1.73

FE 2.02 1.86 1.84 1.67 1.76 1.89 1.85 2.03 2.06 1.84 2.08 1.88 2.15 1.88 1.97 1.96

BWI 12.6 12.7 12.8 13.2 13.8 13.2 13.2 13.9 12.5 14.1 13.3 13.9 13.5 14.0 14.3 13.6

Total Kton 2,205,158 1,265,308 1,258,655 786,779 2,331,833 1,619,019 1,574,138 1,161,165 2,789,017 1,759,993 1,348,367 1,850,149 7,549,048 6,210,022 5,457,959 39,166,610

KTon. Baja VS KTon. Buena VS 977,110 1,228,048 662,989 602,319 588,911 669,744 467,006 319,773 986,812 1,345,021 896,194 722,825 388,565 1,185,573 122,133 1,039,032 859,684 1,929,333 308,294 1,451,699 338,173 1,010,194 366,861 1,483,288 1,693,348 5,855,700 1,238,726 4,971,296 703,609 4,754,350 10,598,415 28,568,195

Período 1 al 12 Enero 13 al 19 Enero 20 al 26 Enero 27 al 31 Enero 1 al 9 Febrero 10 al 16 Febrero 17 al 23 Febrero 24 al 29 Febrero 1 al 8 Marzo 9 al 15 Marzo 16 al 22 Marzo 23 al 31 Marzo 1 al 30 abril 1 al 31 Mayo 1 al 30 Junio

Ley de Corte % Baja VS % Buena VS 0.59 44.3% 55.7% 0.61 52.4% 47.6% 0.65 46.8% 53.2% 0.63 59.4% 40.6% 0.50 42.3% 57.7% 0.77 55.4% 44.6% 0.69 24.7% 75.3% 0.68 10.5% 89.5% 0.75 30.8% 69.2% 0.96 17.5% 82.5% 0.74 25.1% 74.9% 0.84 19.8% 80.2% 0.60 22.4% 77.6% 0.83 19.9% 80.1% 0.70 12.9% 87.1% 27.1% 72.9%

Tabla: Resumen alimentación FY04 para la Humedad Residual. Semana Ene04_S1 Ene04_S2 Ene04_S3 Ene04_S4 Sub-Total

Ton 2,205,158 1,265,308 1,258,655 786,779 5,515,900

Ton. %HR < 30 814,659 463,602 476,958 266,173 2,021,392

Ton. %HR > 30 1,390,499 801,706 781,698 520,606 3,494,509

% (%HR < 30) 36.9% 36.6% 37.9% 33.8% 36.3%

% (%HR > 30) 63.1% 63.4% 62.1% 66.2% 63.7%

Feb04_S1 Feb04_S2 Feb04_S3 Feb04_S4 Sub-Total

2,331,833 1,619,019 1,574,138 1,161,165 6,686,155

612,824 328,907 320,825 144,907 1,407,463

1,719,010 1,290,112 1,253,313 1,016,258 5,278,693

26.3% 20.3% 20.4% 12.5% 19.9%

73.7% 79.7% 79.6% 87.5% 80.1%

Mar04_S1 Mar04_S2 Mar04_S3 Mar04_S4 Sub-Total

2,789,017 1,759,993 1,348,367 1,850,149 7,747,526

288,132 244,462 341,810 159,049 1,033,453

2,500,885 1,515,530 1,006,557 1,691,100 6,714,072

10.3% 13.9% 25.3% 8.6% 14.5%

89.7% 86.1% 74.7% 91.4% 85.5%

Abril 2004

7,549,048

1,041,098

6,507,949

13.8%

86.2%

Mayo 2004

6,210,022

415,482

5,794,541

6.7%

93.3%

Junio 2004 Total

6,180,910 39,889,561

949,826 6,868,714

5,231,085 33,020,849

15.4% 17.22%

84.6% 82.78%

Nota: HR es la humedad residual

BHP BILLITON MINERA ESCONDIDA LIMITADA GEOMETALLURGY

Geomet Long Term Models NOV03 Revisiting same data & using plant results •

ESCONDIDA

Hardness model with same data and improved definition of drivers and domains using UCS-PLT

•

TPH models using new plant data, particularly %+100#, limiting SPI values and recalculated TPH. Recalculated plant Tph values is unique valid approach (filter plant limitations prior to comparison against forecast) • MEL TPH model incorporates SPI as upper limit for TPH capping based upon real plant events. • CEET TPH for FY05 and 5Yr planning. Updating with new samples in march 04

•

Recovery Flotation model developed with especial efffort to improve empirical factors and real differences between Los Colorados and Laguna Seca as feedback to the models. •

Copper Concentrate Grade Addition of new drillhole data •

Updated congrade calculation equations from mineralogy. Used same congrade model for both plants adding 1% to LC (empirical)

GEOMET

ESCONDIDA THROUGHPUT

•MEL TPH model completed as required for use in FY05 Budget. •Use of andesite and porphyry in estimation of F80 • Use of BWi in estimation of P80 instead of fixed values (as in Oct02) with capping at 230 µ for Los Colorados and 215 µ for Laguna Seca •Maximum Tph fixed at 6000 for Los Colorados and 5500 for Laguna Seca •Use of Spi for the 1st time as a capping value for Tph from real plant events information Spi 70 – 80 80 – 90 >= 90

Tph LC 4,168 3,889 3,600

Tph LS 4,000 3,800 3,500

GEOMET

ESCONDIDA THROUGHPUT Reconciliation Reconciliation Model TPH MEL & CEET Nov03 v/s Real Los Colorados Recalculated

TPH 6,000

% Dif 60

JUL02-OCT03 CALIBRATION FOR NOV2003 MODEL WEAK UNDERESTIMATION -1.3% RELATIVE

UNDERESTIMATION SUBJECT TO PLANT CHANGES

+0.7% RELATIVE

5,500

55 50 45 40 35 30 25

5,000

20 15 10 5

4,500

0 -5 -10 -15

4,000

-20 Jul02

Ago02

Sep02

Oct02

Nov02

Dic02

Ene03

Feb03

Mar03

Abr03

May03

Jun03

Jul03

Ago03

DIF REL Plant-Mod (BlkParc)

TPH_Real LosColorados

CEET Nov03 (MinnovEx)

TPH MelNov03(BlkParc)

Sep03

Oct03

Nov03

Dic03

Ene04

Feb04

Mar04

Abr04

TPH_Recalc LosColorados

May04

Jun04

BHP BILLITON MINERA ESCONDIDA LIMITADA Pre-Crushed Feed for SAG Mills

Throughput : Effect of “fines” –1/2” Fines Effect on TPOH (-1/2") Laguna Seca y Los Colorados (SAG3)

6000 y = 82,845x - 8,1522 R2 = 0,9401

5000 TPOH

4000 3000 2000

LC_TPOH LS_TPOH

1000

Lineal (LC_TPOH)

y = 44,648x + 542,83 R2 = 0,6192

Lineal (LS_TPOH)

0 20

30

40

50

minus 1/2" (%)

60

70

Pre-Crushed Feed Proyecto

Inversión

Beneficio

Estado Actual

Planta de Prechancado

MUS$ 20-25

8% a 10% aumento TPH cuando exista limitación SAG

Factibilidad en licitación

Se comienza a realizar un estudio a nivel conceptual.

Alternativas a ser estudiadas : a.- Planta de Chancado separada para Los Colorados y Para Laguna Seca. b.- Planta de Clasificación, donde el bajo tamaño de harneros alimenta a los Colorados y el Sobre tamaño es tratado en planta de Chancado para alimentar Laguna Seca