For any one doing drill planning taking a guess at how long it will take to complete a drill program is one of the more interesting exercises. If you are luckly you look at last years drilling and use those numbers in the current estimate. But for people who: Don’t have last years drilling Are drilling some where totally new You can skip to the results from here:

Hi All, Let’s talk about improving these estimates or how to do a site specific adjustment. Revisiting the literature I found this paper Álvaro Corral, Álvaro González (2019). Power Law Size Distributions in Geoscience Revisited one could argue (but you won’t argue) that I should use a power law distribution for the cavities instead of an exponential, but that would require two parameters instead of one and it is easier to reason with less parameters at least initially.

Hi All, In this article we are going to integrate our estimate of background rate of cavities from caliper data we modelled in Part 1 with the likelyhood of detecting a cavity by drillhole spacing we generated in Part 2 . One of the issues with the simulation modelling estimating the background rates in Part 1 was the estimate of cavity distribution was done for the entire data set. As this is an Iron Ore data set from open file WAMEX data I know from experience that there are more cavities in certain stratigraphic units and alteration zones (hard cap).

Wecome back, Before integrating the data we generated in part 1 we are going to estimate the chance of intersecting a cavity on a blast pattern for a series of cavity sizes and blast pattern designs. To start the demonstration we build a baseline drill pattern of 5x7m with a fixed 0.27m hole diameter that we will keep fixed for all simulations. Now that we have a grid, we add a cavity of 1m diameter.

Hi All, Here is the first in a series of posts covering a bit of ground on cavity detection. From estimating the proportion of cavities in exploration drill holes to their chance of detection with MWD on a blast pattern. First off we define a cavity, for the sake of an exploration drill hole a simple definition might be a caliper measurement that flatlines at the maximum value. Looking over the histogram we can see a few points of interest:

Hi All, Let’s touch on one of the many subtle issues around wireline logging and gamma logging in particular and it’s flow on effects. I have seen a few arguments on where to place the stratigraphic contact on a gamma log: above the peak, on the peak, below the peak, this then rapidly escalates to we need to get all the surfaces to snap to interpretations exactly! A solution for the problem might be as simple as “within the assay interval”.

Hi Everyone, A post has been doing the rounds from an exploration manager looking for a fieldy and geologist and was having trouble finding anyone. Considering the current environment this is likely to be an ongoing issue. I would love for a technical solution to this problem so lets run though a small set of considerations around commercial of the shelf sensing on a exploration drill rig. Imagery Ensure that the light output is stable in both intensity and colour balance, LEDs are a good choice here for practical reasons if you are willing to suffer higher maintenance costs and calibration issues quartz halogen bulbs are preferred.

Hi All, I would like to start my posting journey by talking about an issue that is near and dear to my heart: reading data. In Australia lucky geologists and data enthusiasts have access to a fantastic source of open file geoscientific data provided by our geological services such as GSWA and as tenements are released the data from then slowly becomes available as open file data under the fantastic CC4.