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An introduction to borehole surveying

Who need surveys anyway? Run an electronic multi-shot survey tool Without cables, batteries or computers With its own QA system Look at some survey results Observe the effects of borehole deviation

E N C O R E

Borehole Surveys WHERE DID THAT DRILLHOLE GO?

FLEXIT SmartTool Survey System

E N C O R EBorehole Surveys

E N C O R E

Borehole Surveys WHERE DID THAT DRILLHOLE GO?

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Without surveys, you could lose your depositMINES & QUARRYS

Exploration; coring, RAB and RC

Orebody definition coring

Drill & Blast development

Production blasting

Raisebore pilots

DRILLING IS INFORMATION TECHNOLOGY, MAXIMISE IT WITH

F L E X I T

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Without surveys, the ground isn’t engineered

GROUND ENGINEERING

Site investigation

Grout curtains

Ground anchors

Compensation grouting

Drill & Blast tunnelling

DRILLING IS INFORMATION TECHNOLOGY, MAXIMISE IT WITH

F L E X I T

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Operating the FLEXIT MultiSmartFor a multi-shot drillhole survey, you need:-

The SmartTool

1 SensIT in hole probe {NO film, batteries or cables }

2 StoreIT pocket data pad {NO stopwatch or notes }

3 An office PC with the MeasureIT and DisplayIT software

Some Running Gear

3 Shock sub, pressure barrel & aluminium sinker bars

4 Wireline, rods, pipe or rope to run SensIT into the hole

Drillsite Details

5 Hole reference and measurement depth

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SensIT in an AusMine running gear kit

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Start the survey with the StoreIT data pad

1 Switch ON StoreIT

2 Use SETTINGS to enter:-

Hole reference number

Start station depth (say, 250m)

Station depth interval (say, 6m)

Survey direction (say, up)

3 Press DATA to confirm entries

4 Press NEW to start SensIT, using the radio chip

5 SensIT is now taking a reading every 5 secs

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Preparing SensIT for running into the hole

1 Place SensIT in the pressure barrel, supported by

the spring hanger

2 Lubricate O-rings. Tighten threads by hand

3 Tong up running gear threads

4 Run SensIT to survey start station depth; hold it still.

Spear-type landing collar Bottom sub with shock assemblyTop sub assembly

3 x 1.5m aluminium spacer bars Totally sealed SensIT probe

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Taking the first shot with StoreIT

1 Switch ON StoreIT

2 Screen will show

3 Press & hold OK until StoreIT peeps.

Depth 250 m (start depth)Press OK

MeasuringWait ..5 secs (counting down)

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Taking the next shot with StoreIT

1 Wait until StoreIT peeps again

and screen shows

2 Move SensIT up 6m to the 244 m station

3 Press and hold OK until StoreIT peeps.

Depth 244 m(start depth-6m)Press OK

MeasuringWait ..5 secs (counting down)

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Continuing the survey with StoreIT

During a survey use SETTINGS to:-

Change station depth

Change station interval

Redo or duplicate a station

End the survey

Start a new survey

while SensIT is down the hole

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1 Use SETTINGS to:-

2 Press and hold OK until StoreIT peeps.

3 Pull running gear out of the hole, remove

SensIT from pressure barrel & place

within 10m of StoreIT.

Completing the survey with StoreIT

End Survey?Press OK

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1 Use SETTINGS to:-

2 Press & hold OK until StoreIT peeps.

3 Wait until download is complete

4 Switch OFF StoreIT

Transfer data from SensIT to StoreIT

End Session?Press OK

DownloadingRecord No. # (counting)

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Download data from StoreIT to a PC

1 Connect TransIT aerial to your PC serial port 2 Switch ON StoreIT

3 Run MeasureIT software; click Download

4 The radio link and software do the rest!

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Quality Check system guarantees results

• Checks for tool movementtool movement

• Checks for magnetic disturbance

• Allows you to delete or adjust unreliable readings• See the MagIC presentation

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A tabulation for each station of up to 17 measurements.

Choose only the ones you want.

A true plot of the hole in plan, E/W or N/S sections

Choose the scale, colours, marks, grid spacing

Any number of holes, collar extension on/off

Supplementary data plotted against hole path

Max/min hole separation

Exported to any other software

How would you like to see the results?

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How would you like to see the results?

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How would you like to see the results?

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Note:

Four degree change in dip over first 2 metres

Remainder of hole is relatively straight. Total

error of 1.13 metres (6%) at 16 metres depth

Some typical readings from a “vertical” hole

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Borehole interference in Civils projects

It’s so simple withFLEXIT

Surveying will prove the integrity of reinforcement programs

MeasureIT warns you when hole separation exceeds set limits

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Six inclined grout holes are collared at 150 deg.

to allow for known RH deviation; see 2, 4 & 6.

Unfortunately 1, 3 & 5 hadn’t read the script!

Displaying hole paths on a PC

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Drilling Management Drill pattern at quarry floor

Bench height 33 m

Hole inclination 14°Drill steel Ø76 mm retrac / T45

Drill pattern 2.5 x 2.75 m2

Rock type Granitic gneiss

1 2

3 7

3

4 56

3 9 3 6 3 5 3 4

3 3 3 2

3 1

7 8 9 1 0

1 11 2

3 0 2 9

2 8

2 7

2 6

1 3

1 4 1 5

2 5 2 4

1 61 7 1 8

2 3

2 0

2 2

2 11 9

12

3 8

3 4 5 6

3 9 3 6 3 53 4

3 33 2 3 1

78

9

3 7

1 0 1 1 1 2 1 3 1 4 1 5 1 6

3 0 2 9 2 8 2 7 2 6 2 5 2 42 3 2 2

2 1

2 0

1 7 1 8 1 9

Bench toe

Bench crestH = 33 m

Drill-hole collar positions

Drill-hole positions at quarry floor

Clustered shothole areas / Risk of dead pressing

Vacant shothole areas / Risk of toe problems

Small burden areas / Risk of flyrock

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It’s so simple withFLEXIT

Keep in touch with product news at<http://www.flexit.se>

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Blast data

Ampang Quarry Malaysia

Rock type Granite

Bench height 18 m

Drill-hole diameter Ø89 mm

Drill pattern 3x3 m2

Explosives

Emulite 150 5 kg/hole

ANFO 70 kg/hole

Powder factor 0.46 kg/bm3

Photo: S.O. Olofsson

I’ve just run a MultiSmart soI know where that drillhole went!

E N C O R EBorehole Surveys