Percussion/Churn Drilling: Rotary Drilling: Diamond Core Drilling:

Core DrillingTruck

Mounted

Drill Rods

Drill Cores

Core Placing and Wrapping

(Coring)

Core recovery RQD (Rock quality designation) Logging

– Lithology & Geologic structure– Rock mechanic properties– Water inflow

Core splitting (Assay + Back up)

Core Size (Wireline core barrel)

EX 7/8 in

AX 1-3/16 in

BX 1-5/8 in

NX 2-1/8 in

AQ 1-1/16

BQ 1-7/16

NQ 1-7/8

HQ 2-1/2

PQ 3-11/32NX

Costs Rotary Percussion Core

Sandstone 1-2 3-6 20-30

Carbonate 1-4 4-6 20-35

Igneous 6-12 15-32

Drill Pattern

Drill Spacing

- (Exploration) 800 1000 m - 200800(Definitive) m - 20150(Development) m

Disseminated Gold

Exploration drill spacing = 200m Definitive drill spacing = 80-100m Development drill spacing = 40-50m

ตั�วอย่�าง Porphyry Copper

Exploration drill spacing = 200m Definitive drill spacing = 80-100m Development drill spacing = 40-50m

Uranium

Exploration drill spacing = 800-1600m Definitive drill spacing = 300m (vein) -

900m (Sediment) Development drill spacing = 15-45m

- Rotary 4 5 in, Assay Interval 1 .5 m, Cor e NX

Coal

Exploration drill spacing = 500-1000m

Definitive drill spacing = 80-100m Development drill spacing = 25m

Tin (Placer deposits)

Exploration drill spacing = 200-500m Definitive drill spacing = 100-150m Development drill spacing = 40-50m

Chur n Dr i l l Assay Interval 0.3m

Oil Shale

Exploration drill spacing > 2000m Definitive drill spacing = 1000-2000m Development drill spacing = 500m