EP 171 | Part 2 of 2: Managing Uncertainty - How Better Grade Control Leads to Better Decisions
Fresh Thinking by Snowden Optiro
Release Date: 08/19/2026
EP 174 | Platinum: Is It Worth Its Weight in Gold?
Fresh Thinking by Snowden Optiro
Platinum is one of the world’s rarest and most geographically concentrated metals, with applications spanning the automotive, industrial, jewellery and emerging hydrogen sectors. But what does its evolving supply and demand outlook mean for the mining industry? In this episode of Fresh Thinking by Snowden Optiro, Senzeni Mandava Matondi and Julian Aldridge explore platinum’s geology, market dynamics and strategic importance. They discuss the concentration of global platinum supply, changing automotive demand, the potential role of hydrogen technology, substitution between platinum group...
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EP 173 | The Theory of Sampling: Why Every Mining Decision Begins with a Representative Sample
Fresh Thinking by Snowden Optiro
Was the sample representative? Every geological model, resource estimate, grade control decision and reconciliation result ultimately depends on the quality of the samples behind it. In this episode of Fresh Thinking by Snowden Optiro, Melanie Bulley is joined by Senzeni Mandava Matondi to explore the Theory of Sampling and why representative sampling is fundamental to reliable decision-making throughout the mining value chain. They discuss why natural heterogeneity makes sampling challenging, the difference between correct and incorrect sampling errors, why precision should not be confused...
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EP 172 | Tailings Are Not Just Relocated Ore: The Nuances of Tailings Mineral Resource Estimates
Fresh Thinking by Snowden Optiro
Tailings Mineral Resource Estimates can appear straightforward. The material has already been mined, crushed, processed and deposited in one location — but tailings facilities present their own unique set of technical challenges. In this episode of Fresh Thinking by , Senzeni Mandava and Melanie Bulley explore the nuances of estimating Mineral Resources within tailings facilities. They discuss how tailings differ from conventional in situ deposits and why depositional engineering, rather than natural geological controls, can become fundamental to understanding continuity. opics covered...
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EP 171 | Part 2 of 2: Managing Uncertainty - How Better Grade Control Leads to Better Decisions
Fresh Thinking by Snowden Optiro
In Part 2 of our Fresh Thinking by two-part series, host Melanie Bully is joined by Senzeni Matondi to continue the discussion on why the most expensive mistake in grade control isn’t necessarily mining low-grade material — it’s making the wrong decision about whether material is ore or waste. Following on from Part 1, this episode explores how mining operations can make better grade control decisions by understanding and managing uncertainty. Melanie and Senzeni discuss why average grade alone doesn’t tell the full story, how conditional bias and grade smoothing can affect ore and...
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EP 175 | Why Resource & Reserve Reconciliation Matters
Fresh Thinking by Snowden Optiro
In this episode of Fresh Thinking by Snowden Optiro, Rayleen Hargreaves, Principal Consultant at Datamine and Product Owner of Reconcilor, talks with Ian Glacken, Executive Consultant at Snowden Optiro, about the importance of reconciling mineral resources and reserves across the mine value chain. Resource and reserve reconciliation is often given less attention than the production stages of the mining process, yet it provides an important link between what a company reports, what it plans to mine, and what is ultimately produced. Rayleen and Ian discuss: The role of resources and...
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EP 170 | Part 1 of 2: Why the Most Expensive Mistake in Grade Control Isn't Low Grade
Fresh Thinking by Snowden Optiro
What if the most expensive mistake in grade control isn’t mining low-grade material — but making the wrong decision about what is ore and what is waste? In this two-part episode of Fresh Thinking by Snowden Optiro, Senzeni Matondi, Principal Consultant, joins Melanie Bully, Senior Consultant, to explore why grade control is fundamentally a decision-making discipline, not simply a grade estimation exercise. In Part 1, Senzeni and Melanie unpack the operational and financial consequences of misclassification, including: Ore loss — when valuable material is classified as waste and...
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EP 169 | Why Good Estimates Can Still Produce Poor Reconciliation
Fresh Thinking by Snowden Optiro
If your resource model is statistically robust, why doesn't it always reconcile with production? In this episode of Fresh Thinking by Snowden Optiro, Melanie Bulley and Senzeni Mandava Matondi explore why good resource estimates can still lead to disappointing reconciliation results. They discuss the impact of grade smoothing, explain the concept of conditional bias, and explore why reproducing the average grade is only part of the story. The conversation also covers practical techniques used by resource geologists to assess estimation performance and improve local predictions that support...
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EP 168 | When Geology Isn't Enough - Using Categorical Indicator Kriging to Model Diffuse Mineralisation
Fresh Thinking by Snowden Optiro
How do you model mineralisation when geological boundaries aren't clearly defined? In this episode of Fresh Thinking by , Senior Consultant, Melanie Bulley is joined by Principal Consultant, Senzeni Matondi to explore how Categorical Indicator Kriging (CIK) can be used to model diffuse mineralisation more objectively and consistently. The discussion covers: Why traditional wireframing can be challenging in diffuse deposits How probability-based domaining improves consistency The role of CIK in reducing subjectivity Building more robust and defensible resource models Whether you're a...
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EP 166 | What Consultants See That Mine Sites Miss: Lessons in Mine-to-Mill Reconciliation
Fresh Thinking by Snowden Optiro
What do consultants see that mine sites often miss? In this episode of Fresh Thinking bySnowden Optiro, Rayleen Hargreaves is joined by Ian Glacken to discuss the most common mine-to-mill reconciliation challenges, from stockpile management and siloed teams to understanding variance and improving decision-making. Learn why reconciliation is more than a monthly report—it's a powerful tool for improving mine performance.
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EP 164 | Critical vs Strategic Minerals: Which Commodities Matter Most?
Fresh Thinking by Snowden Optiro
Which commodities matter most in the global race for critical and strategic minerals? In this episode of Fresh Thinking podcast, Senzeni Mandava Matondi is joined by Julian Aldridge and Laurie Hassall to explore the commodities that consistently appear on critical minerals lists around the world and the factors driving their importance. The discussion examines key battery minerals including lithium, cobalt, nickel, manganese and graphite, alongside rare earth elements, tungsten and aluminium. The team also explores how geopolitical considerations, supply chain security and processing...
info_outlineIn Part 2 of our Fresh Thinking by @SnowdenOptiro two-part series, host Melanie Bully is joined by Senzeni Matondi to continue the discussion on why the most expensive mistake in grade control isn’t necessarily mining low-grade material — it’s making the wrong decision about whether material is ore or waste.
Following on from Part 1, this episode explores how mining operations can make better grade control decisions by understanding and managing uncertainty.
Melanie and Senzeni discuss why average grade alone doesn’t tell the full story, how conditional bias and grade smoothing can affect ore and waste classification, and why local accuracy around the cut-off grade is so important.
They also explore grade control as a complete value chain — from sampling, QA/QC and geological logging through to estimation, dig planning, mining execution, stockpile management and mine-to-mill reconciliation. The conversation then turns to modern approaches to uncertainty and risk, including conditional simulation, probability-based ore classification and risk-based digline optimisation.
In this episode Melanie and Senzeni discuss:
- Why two models with similar average grades can deliver very different operational outcomes
- Conditional bias and the impact of grade smoothing
- The importance of local accuracy around the cut-off grade
- How ore loss and dilution result from misclassification • Why reconciliation reflects the performance of the entire grade control system
- Moving from deterministic estimates to risk-informed decision-making
- What best-practice grade control looks like at high-performing operations
The key message from this two-part series is simple: grade control isn’t about producing the perfect block model — it’s about consistently making better mining decisions.