To do this you extract the vein walls based on this selection This selection is then used to create a vein model. This process allows you to select those parts of the ore body that make a single vein or lens. Then create a new interval selection on either the assay table or geology table and select each of the mineralised intervals that form the lens or vein in question. Using LF Mining the best way I could think of it to assume you are working with a vein – which is usually the case for a grade by thickness view, even if it is not a true “vein” if the grade lens has a depth x thickness x width this should still work.įirst you will need to either composite the drillhole assay data to a regular support (see my basics of grade interpolation blog for some ideas on how), or ensure you have a sample thickness field in the assay table – this is the best option as it allows you a little more flexibility in modelling the vein. ARANZ Geo have mentioned that they are looking into making this workflow an integral part of the Leapfrog software.
I found it is possible in LF Mining, LF Geo had me stumped so I flicked the problem to Tim Schurr from ARANZ Geo and thank him for coming up with the solution which I have included below for Leapfrog Geo users. I had not done it before but a grade* thickness plot is just a calculation of the grade times the width – in many estimates we commonly estimate a vein or reef in 2 dimensions by modelling the thickness and the metal accumulation (grade*thickness) variable and then back calculating the grade as metal accumulation / thickness. I was asked recently if I knew if I could do this in Leapfrog. If you can estimate or model the ore body using a 2D metal accumulation grid then you can create a useful grade * thickness plot. It is not really useful to represent a large high sulphidation gold or bulk porphyry this way. This sort of diagram is really only useful when the ore body is tabular such as a vein or reef, whether it be horizontal or vertical, or where the ore body can be represented as such. Whatever your preference these images are simply a long section showing the thickness of the ore body multiplied by the grade. Where suitable this long section will display the ore as a grade * thickness plot, perhaps it is called a gram metre plot, or a gram centimetre plot, a metre ppm plot, perhaps even a metre per cent plot.
One of the most common diagrams you see on stock market releases and on any wall in a mine office is a long section of the ore body.
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