## [ai-geostats] Calculation of fields in models

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• Hi list I would appreciate some feedback on standard/common practice for calculation of fields in models. eg: If I interpolate X and Y in my model from X and Y
Message 1 of 2 , Aug 5 10:50 PM
Hi list

I would appreciate some feedback on standard/common practice for calculation of fields in models.

eg:

If I interpolate X and Y in my model from X and Y data (eg: drill holes), and I ultimately want Z = X + Y, what is the difference between calculating Z = X + Y in samples and then interpolating Z versus calculating Z AFTER X and Y have been interpolated (besides the obvious potential change in spatial characteristics of the variable)...?

Cheers
Perry

Perry Collier

Senior Mine Geologist
Ernest Henry Mine
Xstrata Copper Australia
( (07) 4769 4527
4  (07) 4769 4555
* PCollier@...
" http://www.xstrata.com

PO Box 527
Cloncurry QLD 4824
Australia

"Light travels faster than sound. That is why some people appear bright until you hear them speak"

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• Hi Perry, Well, I tend to stick with the simple calculation. Which values would you use to interpret Z. Off the cuff, I d day just stick with the calculation,
Message 2 of 2 , Aug 8 12:46 AM
Hi Perry,

Well, I tend to stick with the simple calculation. Which values would you use to interpret Z.

Off the cuff, I'd day just stick with the calculation, because :

1. It will be much quicker than interpolating Z - time, time, time!
2. If the relationship is X+Y then a simple calculation is completely acceptable from an auditors point of view, therefore standard/common practice.
3. No need to define and test the Z interpolation method - time, time, time!

Hope this helps.

Regards,
Colin
-----Original Message-----
From: PCollier@... [mailto:PCollier@...]
Sent: 06 August 2005 05:50
To: ai-geostats@...
Subject: [ai-geostats] Calculation of fields in models

Hi list

I would appreciate some feedback on standard/common practice for calculation of fields in models.

eg:

If I interpolate X and Y in my model from X and Y data (eg: drill holes), and I ultimately want Z = X + Y, what is the difference between calculating Z = X + Y in samples and then interpolating Z versus calculating Z AFTER X and Y have been interpolated (besides the obvious potential change in spatial characteristics of the variable)...?

Cheers
Perry

Perry Collier

Senior Mine Geologist
Ernest Henry Mine
Xstrata Copper Australia
( (07) 4769 4527
4  (07) 4769 4555
* PCollier@...
" http://www.xstrata.com

PO Box 527
Cloncurry QLD 4824
Australia

"Light travels faster than sound. That is why some people appear bright until you hear them speak"

**********************************************************************

The information contained in this e-mail is confidential and is

intended only for the use of the addressee(s).

If you receive this e-mail in error, any use, distribution or

copying of this e-mail is not permitted. You are requested to

forward unwanted e-mail and address any problems to the

Xstrata Queensland Support Centre.

Support Centre e-mail: supportcentre@...

Support Centre phone: Australia 1800 500 646

International +61 2 9034 3710

**********************************************************************

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