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 potentially lost forever
• Dilution — when waste enters the ore stream, reducing head grade and consuming valuable processing capacity
• Misclassification — and why it can result from accumulated uncertainty across sampling, geological interpretation, estimation, blast movement, survey accuracy and mining execution
• Reconciliation — and why poor reconciliation can reflect issues across the entire mining value chain, rather than the resource model alone

The key takeaway? A technically sound grade estimate is only useful if it supports the right operational decisions.

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 better mining decisions.

Whether you're working in resource estimation, grade control or mine reconciliation, this episode offers practical insights into bridging the gap between statistical accuracy and operational performance.

How do you model mineralisation when geological boundaries aren't clearly defined?

In this episode of Fresh Thinking by @SnowdenOptiro , 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 resource geologist, geostatistician or mining professional, this episode provides practical insights into one of the industry's most powerful domaining techniques.

Subscribe for more conversations on resource estimation, geostatistics and mining best practice from the experts at 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.

Which commodities matter most in the global race for critical and strategic minerals?

In this episode of @SnowdenOptiro 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 capability influence whether a mineral is considered critical or strategic.

Topics covered include:

• The common commodities found on national critical minerals lists
• The growing importance of rare earths and tungsten
• Why aluminium is increasingly viewed as both critical and strategic
• How Indonesia's nickel production is influencing global markets
• China's role in downstream processing and critical mineral supply chains
• The relationship between resource availability, processing capacity and strategic importance

What makes a mineral critical? What makes it strategic? And why are governments around the world racing to secure supplies of certain commodities?

In this episode of Fresh Thinking by Snowden Optiro , Senzeni Mandava Matondi, Julian Aldridge, and Laurie Hassell explore the growing importance of critical and strategic minerals in today's economy. From copper, lithium and rare earth elements to gallium and germanium minerals, the discussion examines how countries define these resources and why those definitions matter.

The team explores:

• The difference between critical and strategic minerals
• Why supply risk matters
• The role of minerals in national security and defence
• Food security and fertiliser-related commodities
• How critical mineral lists differ between countries
• The influence of processing capability and intellectual property
• The minerals driving the energy transition

Will AI replace geologists? In this episode of Fresh Thinking by @SnowdenOptiro , we explore how artificial intelligence is being used across the mining industry, from exploration targeting and core logging to resource estimation and technical reporting.

Our team discusses the opportunities AI presents, its current limitations, and why geological expertise, judgement and accountability remain critical in mining workflows.

What are the key differences between private mining companies and publicly listed mining companies when it comes to project development, risk, and reporting? In this episode of ‪@SnowdenOptiro‬ 's Fresh Thinking podcast, Senior Consultant, Laurie Hassall speaks with Managing Consultant, Julian Aldridge, about how private companies approach mining project economics compared with companies reporting under the CRIRSCO framework. The discussion covers:

• CRIRSCO Code compliance and disclosure requirements
• Investor protection and technical defensibility
• Resource and reserve classification
• Mining project economics and financing strategies
• Risk appetite in private vs public companies
• ESG considerations in modern mining projects
• How reporting standards influence mine development decisions

This episode provides valuable insight for mining professionals, investors, geologists, engineers, and anyone involved in mineral resource development and project evaluation.

In this episode of Fresh Thinking by Snowden Optiro, Ian Glacken and Susan Havlin explore localised conditional simulation (LCS) and its role in modern resource estimation workflows.

Building on earlier discussions around estimation methods, recoverable resources, and conditional simulation, this episode brings everything together to explain how LCS converts multiple simulation realisations into a single, practical block model—while preserving realistic grade variability.

Key topics include:

• What localized conditional simulation is and why it matters
• How localization transforms multiple realizations into a single model
• The role of the E-type estimate in ranking and distribution
• Differences between LCS and traditional ordinary kriging
• How LCS supports recoverable resource estimation at the SMU scale
• The origins of localization and its relationship to methods like uniform conditioning and MIK

In this episode of Fresh Thinking by ‪@SnowdenOptiro‬, Susan Havlin and Ian Glacken explore the fundamentals of conditional simulation and its role in modelling grade variability and uncertainty in mineral resource estimation.

They discuss how simulation differs from traditional methods like kriging and uniform conditioning, why capturing uncertainty is critical for modern mining decisions, and how multiple realizations can provide valuable insight into upside and downside risk.

The conversation also touches on practical challenges, including reporting to the market and integrating uncertainty into mine planning workflows.