Mine Project

2012/2013

Pretende-se:

1. Definição do nível adequado de produção 2. Método de desmonte (detalhado) 3. Desenvolvimento e traçagem do jazigo 4. Preparação do jazigo 5. Operações de furação, carga e transporte 6. Diagramas de fogo rampas ou galerias de rolagem e câmaras de desmonte.

Project must contain:

1. Adequate level of production (ton/year; m3/year; lifetime years) 2. Mining method 3. Primary and secondary underground development openings 4. Tertiary underground development openings 5. Drilling, loading and hauling operations description and calculations 6. Drilling patterns of a drift and a stope.

Data (surveys distance 500 x 500 metres – square mesh):

Avg. altitude 810 m

Ore deposit A

Survey Sab Footwall depth (m)

Thickness (m)

Avg. grade (%)

S00

S01

S02

S03

S04

S05

S06

S10

S11

S12 356 1 6.2

S13 346 1.5 6.1

S14 319 1 6.8

S15

S16

S20

S21 355 1.5 6.3

S22 353 1.2 6.6

S23 351 1.5 7.2

S24 343 2 7.1

S25 341 1.5 7.8

S26

S30

S31 368 2 8.0

S32 373 2.1 8.4

S33 374 2.2 8.2

S34 382 2.3 7.8

S35 388 0.8 8.0

S36

S40

S41 390 1 6.5

S42 394 2.2 7.4

S43 403 2.3 8.2

S44 403 2.2 7.5

S45 416 1.8 6.1

S46

S50

S51

S52 413 1.2 7.2

S53 414 1.5 6.5

S54 420 1 6.1

S55

S56

Table 1 – Mechanical properties obtained in laboratory

Table 2 – Values of the mechanical properties used in simulation for stability analysis of

Moinho Mine, Aljustrel, Portugal.

Fig 4.1 – Variation of recovery with pillar and stopes dimensions (Moinho Mine)

Fig 4.2 – Variation of safety factor with pillar (pilares) and stopes (camaras) dimensions

(Moinho Mine)