Welcome: We recommend that you open this page in a separate window. If you have not already done this, go back and right click on the "Getting Started" option and choose "Open in New Window". You can then resize the page to some convenient part of your screen to allow you to follow through the tutorial and still see the rest of the NVCL pages.

These pages offer an initial step-by-step guide to exploring the content of the NVCL Demonstrator for the first time visitor. Be advised this may be regularly updated. From the home page the top few pages provide general information about the database and the physical core libraries around Australia from which core will be drawn, as well as where the instruments will be that will be used to collect the data.

Use the follow links to guide you through a typical analysis session.

Map Search Drill Hole Search Drill Hole Details Section View Tray Content

Map Search

  1. To locate HyLogged cores and their content click on “Map” under the “Search” button.
  2. For an overview of all drill holes merely press the “Show Cores” button.
  3. Red crosses will denote drill-holes known to be stored in one of the State and Territory physical core libraries, but which have not yet been scanned. In due course you may be able to click on these and make a request for such cores to be scanned. Green crosses denote example drill-holes that have also been scanned with a HyLogging System. Blue crosses denote where there is a cluster of Drill-holes that have been scanned. Progressively zooming on the map separates these clusters into separate green crosses.
  4. Moving your mouse over a cross will display a label. Red crosses will return the message Asset, indicating that a core asset exists in a library somewhere. For the present these are dummy entries. Find a green cross in the centre of Western Australia and move your mouse over the cross. The label WTB5 should appear. Clicking on this underlined drill-hole name on any green and blue label will navigate you to that drill hole’s “Drill-hole Details” screen.

Drill Hole Search

  1. As an alternative to “Map Search you may also search for drill holes by name, project, owner, map sheet or instrument. From the left hand menu bar choose “Drill-hole” under “Searching”.
  2. To find the Teutonic Bore drill hole WTB5 you may enter any of the following and press search. Type GSWA into the “Owner” field or WTB into the “Search String” field. The former will locate all drill holes currently entered into the database and owned by the Geological Survey of Western Australia.
    The search results table indicates details of the drill holes found and the status of their processing, on the right hand side. The ticks and crosses are largely self-explanatory. In the status column a green tick indicates that the core has been scanned and images are in the database. An orange tick indicates that processing is underway and that while the core has been scanned the database content is not yet complete. A red cross indicates that the core has been scanned but there is no imagery or content yet available. A report may be available if the Report column shows a green tick (in this case go to “View Reports” in the metadata table). The scalar column indicates the status of mineralogical content for the listed core. Where mineralogical scalars exist in the database a green tick appears. A red cross indicates no scalars are yet available. Three green ticks indicate a fully analysed and published dataset.

Drill-Hole Details and Core Tray View

  1. The “Drill-hole details” screen initially provides two pieces of information. A partial meta-data table about the drill-hole (on the left) and a mosaic of all the core trays for this hole (in a separate window on the right) that may have scroll bars to expose additional trays. Notice that the left-hand menu has now expanded to show additional links to individual core trays and the core sections (sticks) within each tray. By scrolling the whole page slightly a scrollable column of all core trays will appear laid out contiguously as if you were standing in a physical core shed. A mouse wheel is very useful here!
  2. To examine enlarged, higher-quality core tray images you have three options: (a) by clicking on any individual core tray in the mosaic, (b) by clicking on the tray number in the left-hand menu list, or (c) clicking on a tray in the scrollable stack of trays.
  3. Choose tray number two by any one of these options and an enlarged view of the core tray will be loaded. Clicking in this view toggles between two different enlargements of the tray. In the larger of the two scroll bars appear to allow vertical and lateral scrolling. On this page you can modify the image properties with gamma, brightness and contrast controls. Changes are activated by clicking “Refresh”. Buttons are also provided for steeping forwards and backwards through the core tray list. Image properties previously changed will be retained on new core trays, for the current drill-hole.

Section View

  1. If something interesting catches your attention in the core tray view, say in tray 14, expand the drop down list of sections under core tray 14 on the left-hand menu and click on section 90. A much more detailed image of a portion of the core section will be loaded. Initially this will be a 25 sample selection. Depths are shown on the left and access to subsequent groups of samples is available from additional page numbers at the foot of the display (you may need to scroll the display here).
  2. Increasing the number of samples in view is possible but will of course increase the download time slightly. The number of samples that get displayed can be controlled from the top dialogue labelled “Samples per page”, and the size at which these are displayed can be controlled by using the “Image Scale” options (top right). Using these two controls you can look at a larger number of samples or a whole core tray section and compress it to fill a smaller portion of the screen thus requiring less scrolling. Experiment with this to get a reduced sized overview of the whole section. If you do load a whole 200 sample section (this may take a minute) and the data is cached you can instantly change between scales by changing the scale amount.
  3. Return to 25 samples at 100% scale and choose page 1 of the available seven pages. Next tick the selection box at the top of the screen that says “Show spectra on mouse over”. This pops-up a floater that displays the sample’s visible and infrared reflectance spectrum when the mouse is moved over the core. Try it and when you’ve finished experimenting un-tick the selection box.
  4. Next from the drop down box headed “Select a scalar” choose the scalar or attribute labelled “TSA-A-Mineral1” and press “Add”. This is TSG’s TSA algorithm estimate of the dominant mineralogy for each sample. Null or Aspectral may be returned if the spectra are noisy or the algorithm cannot make a reasonably safe interpretation. Note that the algorithm generating this interpretation is called The Spectral Assistant (TSA) and it is just that. It is not infallible! For more details of this procedure consult the TSG web site at www.thespectralgeologist.com. Additional scalars can also be selected from the drop down list and by pressing “Add” again can be added to the display. A black cross in the scalars header bar removes the selection.

Core Tray Content

  1. At this point return to the left-hand menu and click on >Hole :WTB5. This will re-display the Drill-hole Details and Tray Details page. To examine the mineralogical content of this drill-hole now go to the drop down list headed “Select a scalar”, then scroll down and choose TSA_A_Mineral1. Press “Show Map”. A map of each core tray showing the interpreted dominant mineralogy will now appear to the right of the stack of core tray images. The size of each sample will be evident from this display. A very important point here is to focus on the broad patterns of the mineralogy not individual samples.
  2. Scroll the display to see the full drill-hole and see how the mineralogy appears to be changing. What do the colours mean? The colour key is available in two ways. First click on the kaki colour in core tray 2. A red circle will appear on the core tray image and a label indicating the value of the scalar (in this case probably the word paragonite and its colour) will appear where you clicked on the scalar map. An alternative way of interpreting the colours is to click on the yellow key at the top right of the stack of tray maps. This will display a full legend of colours and codes or scalar values, in a separate window.
  3. We suggested focusing on the broad patterns of mineralogy. A good way to do this is to experiment with the “Image scale” option at the top of the stack of maps. Choosing say 25% will display the full drill-hole’s dominant mineral distribution in one screen without needing to scroll. Useful?
  4. Returning to the drop-down list headed “Select a Scalar”, choose the one labelled “Mica Intensity”. This is a measure of the depth of the infrared absorption feature near 2208 nm filtered for noise and bad samples. Press “Show Map” again and a new set of tray maps will appear alongside the previous one. Notice how this overall distribution matches the white mica minerals shown in the previous TSA interpretation plot.
  5. Next using the black cross at the top of each column of tray maps remove the plots so far displayed. Then click on the button headed “Show Default Maps”. After a short pause this will now display eight columns of content maps against each core tray. These have been selected as a way of quickly getting a simple “bets set” overview of the geology of this drill hole. These maps comprise both spectrally derived scalars as well as imported ones (for example the originally-logged Major Lithology, Alteration and Zn %). The Alteration Class column shows a set of spectrally-defined composite mineral assemblages. Click anywhere in one of these images to get a content read-out. Notice how they agree with and also compliment the mapped alteration.
  6. Experiment by adding other scalar maps yourself. At this time we are refining the whole selection of mineral attribute scalars and the list is currently inappropriately long and not all are useful. Expect to see changes in this in the future.

Please feel free to record your experiences and offer feedback by going to the “Feedback Blog” page on the left hand NVCL main menu. Many thanks.

Watch this space for upcoming Tutorial Guides.