Step-by-step guides to drillhole validation, EDA, resource estimation and KCMI/JORC reporting, written by a practising geologist and Competent Person.
Drillhole prep, EDA, resource estimation, KCMI/JORC and software workflows.
Orebit GeoSuite is now free software under the GNU GPL v3: the code, the methods and two tutorials on real public drillhole data whose every number is re-measured from the app. What changed, and why it matters for a geologist's credibility.
Software doesn't make a good resource estimate — the geologist does. But the right tool for your project size, budget, and team matters. Here's how to choose without the marketing noise.
Choosing a cut-off grade isn't a spreadsheet exercise. It's a decision that depends on mining method, metal price, recovery, and how honest your geological model is. Here's how to think about it for Indonesian deposits.
Core logging is where your geological model starts — not in the software, but at the core shed. Bad logging produces bad models. Here's the workflow I use on every Indonesian project.
A grade-tonnage curve looks simple — grade on one axis, tonnage on the other. But reading it correctly requires understanding what the curve assumes and what it hides.
Your kriging search ellipse determines which samples influence each block estimate. Too big and you over-smooth. Too small and you're noisy. Here's how to find the right one.
The JORC 2012 Code isn't vague about what your resource statement must contain. Yet most Indonesian reports I review are missing at least three required elements. Here's exactly what to write.
Sampling theory isn't academic — it's the reason your assay database has errors you can't see. Understand the nugget effect, sample support, and the fundamental sampling error.
Your variogram is the foundation of your kriging estimate. Get it wrong and every block in your model is biased. Here are the five mistakes I see most often in Indonesian resource projects.
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