https://blog.orebit.id/ Recent content on Orebit Blog Hugo en Fri, 29 May 2026 08:00:00 +0700 https://blog.orebit.id/2026/05/5-resource-estimation-mistakes-that-cost-millions/ Fri, 29 May 2026 08:00:00 +0700 https://blog.orebit.id/2026/05/5-resource-estimation-mistakes-that-cost-millions/ I’ve sat on both sides of the table in due-diligence reviews. The buy-side reviewer asking the awkward questions, and the sell-side geologist trying to defend a model that was rushed because the deal team needed numbers two weeks ago. The pattern is depressingly consistent. The same five mistakes show up in project after project, and each one has cost real money to real companies. This post is the senior-to-junior version of that conversation. https://blog.orebit.id/2026/05/compositing-101-getting-the-length-right/ Fri, 29 May 2026 08:00:00 +0700 https://blog.orebit.id/2026/05/compositing-101-getting-the-length-right/ Compositing is the step everyone glosses over. The lecture notes say “composite to a uniform length before kriging” and the analyst picks 2m because that’s what was on the last project. Job done. Except composite length is one of the most consequential decisions in the whole estimation pipeline. It controls the support of your input data, the variance you’re trying to model with the variogram, and ultimately the smoothness of your block estimates. https://blog.orebit.id/2026/05/drillhole-validation-checklist/ Fri, 29 May 2026 08:00:00 +0700 https://blog.orebit.id/2026/05/drillhole-validation-checklist/ A resource model is only as good as the data underneath it. And in 12 years of looking at exploration databases, the same five problems keep showing up: duplicate collar IDs, surveys that disagree with downhole depth, assay intervals that overlap, lithology codes nobody documented, and the silent killer — partial data that looks fine until you actually start estimating. This post walks through the 6-step validation checklist I use on every project before starting EDA. https://blog.orebit.id/2026/05/jorc-table-1-checklist-indonesian-geologists/ Fri, 29 May 2026 08:00:00 +0700 https://blog.orebit.id/2026/05/jorc-table-1-checklist-indonesian-geologists/ JORC Table 1 is where good resource reports stand up and weak ones collapse. It’s the structured disclosure framework that forces you to address every part of the data and methodology that an investor needs to see. Most rejection-grade audit findings I’ve seen in the last few years trace back to a Table 1 section that was skipped, hand-waved, or copied from a previous project without checking whether it still applied. https://blog.orebit.id/2026/05/top-cut-analysis-when-and-how/ Fri, 29 May 2026 08:00:00 +0700 https://blog.orebit.id/2026/05/top-cut-analysis-when-and-how/ Top-cuts are the geological version of pleading the fifth. They’re the analyst’s quiet admission that the data has a problem, and rather than fix the problem, we’re going to truncate it and hope the auditor doesn’t ask too many questions. That’s unfair, but only slightly. Done well, top-cuts are a defensible response to genuine outlier behavior in skewed grade distributions. Done badly, they hide bad domaining, sloppy QA, or anxiety about high grades that are actually real. https://blog.orebit.id/2026/05/variography-for-geologists-who-hate-math/ Fri, 29 May 2026 08:00:00 +0700 https://blog.orebit.id/2026/05/variography-for-geologists-who-hate-math/ If you trained as a geologist and not a statistician, the first time someone hands you an experimental variogram and asks you to fit it, the reaction is usually a quiet panic followed by copy-pasting whatever the senior consultant used last quarter. I’ve done it. Most of my colleagues have done it. The result is variogram models that look fine on screen and then quietly break the kriging downstream. This post is the explanation I wish someone had given me on day one. https://blog.orebit.id/2026/05/jorc-vs-kcmi/ Fri, 22 May 2026 08:00:00 +0700 https://blog.orebit.id/2026/05/jorc-vs-kcmi/ If you’ve ever filed a resource statement for an Indonesian project, you’ve hit the question: do I report under JORC or KCMI? The honest answer is both, and the longer answer is the subject of this post. JORC 2012 (Joint Ore Reserves Committee, Australasia) is the international standard most foreign investors expect. KCMI 2017 (Komite Cadangan Mineral Indonesia) is the domestic standard required for ESDM (Kementerian Energi dan Sumber Daya Mineral) reporting. https://blog.orebit.id/2026/05/getting-started-orebit-toolkit/ Fri, 15 May 2026 08:00:00 +0700 https://blog.orebit.id/2026/05/getting-started-orebit-toolkit/ The Orebit Geologist Toolkit is a single HTML file. You open it in any browser. You upload your collar/survey/assay CSVs. You get strip logs, sections, EDA charts, and resource estimates. That’s the whole pitch. This post walks through getting from “I just bought it” to “I’m looking at my first cross-section” in under five minutes. What you got when you bought it A ZIP file. Inside the ZIP: 01-Drillhole-Prep.zip └─ Drillhole-Prep.