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Charli Oliver

Charli Oliver

  • Joined: November 25, 2022
  • Articles: 287

PODCAST: Declustering… what is the true grade?

In this week's Fresh Thinking by Optiro podcast, Ian Glacken our Director of Geology, and Paul Blackney our Principal Consultant Geology discuss declustering and where to use it. Declustering is a critical technique to understand and use when estimating a resource. It helps you get a more accurate picture of the whole ore body, but why is it controversial in parts of the industry? The podcast at a glance: 0:51 What is declustering and why is mining data clustered? 1:41 What are the implications of not declustering? 2:03 When is declustering useful? 2:52 Do we need to apply declustering to ordinary kriging? 3:26 What are some of the normal methods used when declustering? 5:12 So not everyone uses declustering. Why do some practitioners disavow it? 6:10 Do you both agree on when to apply declustering? 7:22 Are there any circumstances when its mandatory to decluster? 9:12 Where should people go to learn more?

PODCAST: Reconciliation – avoiding problems

Getting reconciliation wrong can lead to dire consequences for miners. In this podcast Optiro's Director of Geology Ian Glacken explains what can go wrong and how we can aim to avoid issues. The Reconciliation podcast at a glance: In this episode: 0:47 What is reconciliation and how it applies to mining? 1:48 What happens when things go wrong? 2:29 If someone has made a poor forecast at the beginning, is there any way back? 3:33 What are the key aspects of reconciliation? 5:46 Why is reconciliation so complicated? Does it need to be? 7:08 What about the standards we need to adhere to? 8:07 Is this just the domain of geologists or are there others involved? 9:09 What are the key aspects of an effective reconciliation? 9:56 Where can people learn more about reconciliation?

What are the F-Factors? 30+ Seconds of Reconciliation Info

These 30+ Seconds of Reconciliation Info are from Ian Glacken our Director of Geology. What are the F-Factors? The F-Factors, or F-Series metrics, are the closest thing we have to a ‘standard’ for reconciliation. They were first proposed and described by Harry Parker in 2006 and have been adopted to various degrees and in various ways by most of the major minerals companies. The three key things to reconcile are the short-term (grade control) tonnage and grade figures, the longer-term (resource or reserve) tonnage, grade and metal, and the ‘product’, i.e. the tonnage, grade and metal from the plant (plus the residue or tails)...

PODCAST: Reasonable Prospects of Eventual Economic Extraction (RPEEE)

Welcome to the second podcast in our Fresh Thinking from the World of Mining podcast series. This week Ian Glacken, our Director of Geology, talks about Reasonable Prospects of Eventual Economic Extraction (RPEEE) with Adam Mullett, and why the principle is critical to reporting resources. The podcast at a glance: 0:48 What is RPEEE? 1:33 Why do we need to have RPEEE as part of all the reporting codes? 2:28 The codes are there to protect investors - reporting the right information to investors is critical 3:19 What has changed from the versions of JORC 2004 to 2012? 4:28 RPEEE has also been controversial because of its inconsistent application 5:34 Why is the principal not being applied everywhere? 6:38 What is the approach for open pit mines for RPEEE? 7:45 How does RPEEE apply to underground mines? 8:56 Are there any differences between how the RPEEE has been applied in the JORC, SAMREC and CIM codes?