rock type determination2

7/29/2019 Rock Type Determination2

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WB ORE TYPE DETERMINATION

STRUCTURE INTENSITY

-BOULDER SIZE

-RQD

-FRACTURE DENSITY

-WEATHERING

Mine Planning Design

EquipmentsMining recovery

Grade Control

Method

-Air Photo interpretation

-Landform-Lineament

-Core physical properties

Disadvantages ; - 100 m spacing core drilling.

- Not enough penetration into real bedrock.

ORE TYPE

Rock type Determination


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Air Photo Core Logging Rec Dry Ore/ Wet Insitu

-Lineament Interp.-Morphology/topography

-Boulder size-Fracture density

-Serp. Degree

-Core Photo

Outlining by GIS Outlining by GIS

Final Map

MRI Mine Planning

Grade Control

Outlining by GIS

Compilation

Weight of evidence Method

Outlining Ore Type of WB from Coring Data


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Boulder Density

Boulder density is calculating percentage of length of boulder

> 1 meter divides total length of boulder in 1 hole in saprolitezone per hole from logging data and photo core.

% Boulder = Length of boulder > 1m x 100 %Total length of boulder in 1 hole

The classified of rock type from Boulder density are:

- 025 % = Fractured area (Type 3)

- 2550 % = Medium fractured area (Type 2)

- 5075 % = Type 1

- 75100 % = Unfractured Area (Type 1)


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Rock Quality Designation (RQD)

This based on the percentage of core recovered,

counting only the pieces of intact core 10 cm orlonger.

RQD % Quality

025 Very Poor

2550 Poor

5075 Fair

75

90 Good90100 Excellent

RQD = Length of core pieces > 10 cm length x 100

Total length of core


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Example :

Total length drilled = 100 cm

Total core recovered : 80 cm

Core recovery =80/100 = 80%

Summed core lengths greater than 10 cm =75 cm

RQD = 75/100 = 75 %

RQD for sample in photograph below = ((85/100)+(85/100)+(70/100)+(50/100)+(90/100))/ 5 = 76 %

Sample identified as Type 1

40 cm 30 cm

35 cm

35 cm20 cm 15 cm

50 cm

15 cm20 cm30 cm25cm

20 cm15 cm15 cm

15 cm

Only coherent fresh rock is considered ; a length of soft and highly weathered core

Would have zero RQD value. RQD can be recorded by geologists while they are logging

in the sample house.


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Descriptive indices of iscontinuities (Comment RQD)

Consideration should be given to type, number of discontinuities, location

and orientation, frequency of spacing between discontinuities, separation

or aperture of discontinuity Surfaces, persistence and extent, infilling and

nature of the surface

Sound RQD Rock material has no joints or cracks, size range > 100 cm

Fissured RQD Rock material has random joints. Cores break along thesejoints. Lightly broken. Size range 30100 cm

Jointed RQD Rock material consists of intact rock fragments separated

from each other by joints. Broken.Size range 1030 cm.

Fractured RQD Rock fragment separated by very close joints. Core lengths< twice NX core diameter. Very broken. Size range 2.510 cm.

Shattered RQD Rock material is of gravel size or smaller. Extremely Broken.

Size range < 2.5 cm.


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Fracture Density

Fracture density is calculating percentage of summary joint

and fracture divides total length of core

Frac. Dens = Joint and fracture x 100

Total length of core


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RQD & Fract Density For Type 1 Area (Watulabu, Delaney, Manggali),

Medium Fractured (Pongsesa) and Highly Fractured (Manggali SW)

0

5

10

15

20

25

30

35

40

45

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100

RQD / m

FractDensity/m

Type 1Pongsesa

Manggali SW

Type 1RQD>50, Fract dens 15

268 Datas

Unfractured Area

(Type 1)

RQD>75, Fract dens

rock type determination2

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