Dynamics G-Ex



1800 105 584



Email Us

english french deutsch spanish mongolian

Miners & Explorers have saved


of used plastic from going to landfill. Join the movement!

1 cart
cart Quote Basket
Continue Shoppingright arrow
You don't have any products
in our cart.
You may want to take a look at some
of our products below.

Added products

Estimated price:
Your details

Item successfully added to your
quote basket.
Thank you. You have successfully requested a quote. Our Customer Happiness Team are onto it now! Done
Ooops! Something went wrong.
Please try again.
Try again
Product is already added.
Please check the cart.
Check cart
Your free catalogue has been
sent to your email.

Dynamics G-Ex Learning Hub

The Fastest Growing Geological Q&A Library in the World. You Ask a Question, We’ll Answer it Honestly!

Manual Vs. Digital: Assessing Drill Core Orientation Techniques

Core samples in core trays

Inaccurate readings of your drill core orientation?

When it comes to drill core orientation, problems can arise from inexperience, lack of knowledge during the markup process and during the collection and interpretation of core samples.

The difference in techniques can also yield varying results.

Core orientation methods broadly fall into two categories: manual and digital. This will depend on the condition and competence of the rock's expected down hole, accuracy and reliability of the data and check back potential, ease of use, and of course, cost and schedule.

Manual methods include the spear, Ezy-Mark™ and Ballmark®, while digital methods include the Reflex and Coretell ORIshot, Devicore™ and Boart Longyear’s TruCore™ system. 


The Manual Methods

The spear method is the simplest and, for many years, has been relied upon to yield accurate and consistent data.

It involves use of a heavy steel spear with a sharp point or a wax-pencil tip on a wire line inside the drill rods once the inner tube has been removed.

How the spear works in the core orientation process

Image source: Orefind.com

The spear will then hit the bottom of the hold, creating a mark on the next piece of rock. As the spear slides along the bottom of the rods, the mark or chip on the core will pinpoint its bottom edge. This is a straightforward core orientation process albeit it can be tricky.

Drillers must ensure that the tip—which should be a sharp taper—is firmly screwed into the spear so it will not bend. Otherwise, the results will be unreliable.

Lowering the spear should also be done carefully to create the desired single punch mark. If it is done too slowly, it will not make a mark. If done too fast, the spear might bounce and create multiple marks or streaked lines.

Determining the optimal speed is achieved through trial and error, based on the angle of the hole and the hardness of the rock.

With Ezy-Mark™, drillers and geologists must take into consideration factors such as a water table because this can prematurely fire before reaching the broken face on which the orientation mark needs to be made.

On the other hand, the Ballmark® system, which relies on an aluminum washer with a ball, also requires careful planning and expertise because if the washer is punched too soon, errors can occur. 


The Digital Methods

The digital methods, in most cases, deliver good orientation marks, providing usable orientation data for mine planning and resource definition, among others.

Among the digital methods, the Reflex can be considered as the most sophisticated when it comes to inner working, comprising digital read-outs and internal silicon accelerometers. It's ideal for vertical or angled holes as well as contact or non-contact core orientations.

To measure the alpha-beta (α-β) of a planar feature, or gamma-delta (γ-δ) for a lineation, a Kenometer is most ideal.

A Kenometer is a user-friendly device which saves geologists' time in analysing core without compromising accuracy of readings.

It is a durable tool with permanent markings that ensures reliability, and its tough aluminum body makes it resistant to hazards on the field.


Watch the video below for a quick guide on how to use the Kenometer:




In any core orientation method, dialogue between the driller and the geologist is crucial.

It is important that the driller is comfortable with the chosen method and that the geologist understands the pros and cons so he or she can spot errors like bad orientation marks.

Drill core orientation is an evolving science but many of the problems can be averted by a well-prepared, well-coordinated and well-informed team with the right tools and equipment. 



This privacy policy sets out how Dynamics G-Ex Pty Ltd uses and protects any information that you may give to us when you use this website. Dynamics G-Ex is committed to ensuring that your privacy is protected. Should we ask you to provide certain information by which you can be identified when using this website, then you can be assured that it will only be used in accordance with this privacy statement.

Dynamics G-Ex may change this policy from time to time by updating this page. You should check this page from time to time to ensure that you are happy with any changes.

What we collect We may collect the following information:

Name contact information including email address and phone number
company information such as company name, address and products used in business
other information relevant to ensure Dynamics G-Ex Pty Ltd can provide quotes / offers to you and your company

What we do with the information we gather We require this information to understand you and your companies requirements and provide you the correct product and excellent service, and in particular for the following reasons:

Create quotes for products that you and your company may require.
We may use the information to improve our products and service.
We may periodically send promotional emails about new products, special offers or other information which we think you may find interesting using the email address which you have provided.
From time to time, we may also contact you for feedback about our products and service. We may contact you by email or phone. We may use this information to customise the website according to your feedback.
You may request details of personal information which we hold about you. If you would like a copy of the information held on you please email sales@dynamicsgex.com.au or call 1800 105 584 (Australia)

If you believe that any information we are holding on you is incorrect or incomplete, please notify us soon as possible, and we will promptly correct any information found to be incorrect.

What we will not do with the information we gather We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure, we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect online.

We will not sell, distribute or lease your personal information to third parties unless we have your permission or are required by law to do so.

Cookies When you view this Site, we may store certain information on your computer. This information may be in the form of a small text file called a "cookie" and can help us improve your experience with the Site. For example, cookies allow us to tailor the Site to better match your interests and preferences. The Site uses cookies to help understand which pages of the Sites are most popular, whic products our visitors are viewing. Cookies are read only by the server that placed them, and are unable to execute any code or virus. With most Internet browsers, you can erase cookies from your computer hard drive, block all cookies or receive a warning before a cookie is stored. Please refer to your browser instructions or help screen to learn more about these functions. Please be aware, however, that some features and programs of the Site may be unavailable to you if cookies are erased or blocked.

Links to other websites Our website may contain links to other websites of interest. However, once you have used these links to leave our site, you should note that we do not have any control over that other website. Therefore, we cannot be responsible for the protection and privacy of any information which you provide whilst visiting such sites and such sites are not governed by this privacy statement. You should exercise caution and look at the privacy statement applicable to the website in question.

ProFab™ Superior Pre-Numbered Calico 200x300mm (8’x12”), 1000/CTN

Please confirm the quantity of the product you would like to add to your quote

- +

Please confirm the quantity of the product you would like to add to your quote

- +
Something went wrong.
Please try again.
Product has been successfully added to cart. OK
Product has been successfully removed from cart. OK
Cannot removed product from cart.
Something went wrong. Please try again.
Product is already added.
Please check the cart.