GeOCHemISTea

In this episode of GeOCHemISTea, we sit down with Lynda Bloom, an internationally recognized exploration geochemist and QA/QC specialist, to reflect on nearly 50 years in the mining industry and unpack some of her biggest geochemical beefs. From the dangers of comparing datasets using averages to understanding certified reference materials, analytical precision, and the uncertainties introduced during sampling, Lynda challenges some of the industry's most persistent assumptions.
We also explore her unconventional career, the realities of consulting and junior mining, the importance of mentorship, and a few memorable field experiences from around the world. Along the way, Lynda introduces MineLabify, a new approach to laboratory auditing.
It is a candid, entertaining, and technically insightful conversation about questioning our data, challenging established practices, and knowing when the numbers can actually be trusted.
For this episode we read:
Practical applications of quality assurance and quality control in mineral exploration, resource estimation and mining programmes: a review of recommended international practices (Smee et al., 2024)

What if we treated mine waste with the same curiosity and rigor as the orebody itself?
This month on GeOCHemISTea, Sam sits down with Dr. Anita Parbhakar-Fox to talk about rethinking mine waste across the life of mine. From environmental geometallurgy and waste characterization to valorization, closure planning, and the push toward net-zero mine waste, Anita challenges us to stop seeing waste as an afterthought.
Plus, over tea, we dig into the geoscience skills shortage, the pressures facing educators, and why inspiring the next generation requires supporting the people teaching them.

For this episode we read:
Action Versus Reaction: How Geometallurgy Can Improve Mine Waste Management Across the Life-Of-Mine (Parbhakar-Fox and Baumgartner, 2023)War on mine waste (Parbhakar-Fox, 2023)
MIWATCH Blog

In this episode of GeOCHemISTea, Sam talks with Dr. Brenda Bowen, Professor of Geology and Geophysics at the University of Utah, about using remote sensing to understand geochemistry at the scale of entire landscapes.
Brenda traces her work from the Navajo Sandstone and ancient fluid-flow systems to modern salt flats, desert environments, and Mars analogs. We explore how multispectral and hyperspectral data can map mineralogy, how minerals preserve records of water and environmental change, and how surface halite can even provide clues about groundwater depth.
We also talk about interdisciplinary science, unexpected career paths, fieldwork, and why some of the most interesting discoveries happen when geochemistry connects with hydrology, microbiology, ecology, and remote sensing.
For this episode we read:
Multispectral Surface Reflectance as an Indicator of Groundwater Depth for Salt Crust Systems: Insights From the Bonneville Salt Flats, Utah (Radwin et al., 2026)
Bleaching of Jurassic Navajo Sandstone on Colorado Plateau Laramide highs: Evidence of exhumed hydrocarbon supergiants? (Beitler et al., 2003)
Southwestern Australia Acid-Saline Mineralogy: Observations From Reflectance Spectroscopy (Radwin et al., 2023)
Fracture-focused fluid flow in an acid and redox-influenced system: diagenetic controls on cement mineralogy and geomorphology in the Navajo Sandstone (Bell and Bowen, 2014)
Decadal‐Scale Trajectories of Land Cover Change Along the Colorado and San Juan Rivers in Response to Declining Water Storage in Lake Powell Reservoir (Kasprak et al., 2026)
Mapping mineralogy in evaporite basins through time using multispectral Landsat data: Examples from the Bonneville basin, Utah, USA (Radwin and Bowen, 2020)
Shrinking salt crusts of the Bonneville Basin, Utah: Observations from multispectral remote sensing (2025)

Is the next generation of mineral discoveries really hiding at extreme depths, or have we overlooked opportunities much closer to the surface?
In this episode, Sam sits down with returning guest Mark Arundell, geoscientist and geochemical consultant, to challenge one of exploration's most widely accepted assumptions: that bigger discoveries require deeper drilling. Together they explore the "fallacy of the deep," discuss why statistics matter when interpreting exploration success, and examine how integrating geology, geochemistry, geophysics, and modern analytical techniques can unlock value from legacy datasets. They also share insights from consulting, near-miss exploration, and why asking better questions often leads to better discoveries.
In this episode:
Why the "deeper is better" narrative became so influential
Average vs. median discovery depths and why the difference matters
The untapped potential of the first 100 metres
Using modern multi-element geochemistry to reinterpret historic data
How legacy drill core and pulps can create new exploration opportunities
The psychology of exploration and why expensive targets often seem more attractive
When deep drilling is justified—and when it is not
Practical advice for designing smarter exploration programs
As always, we bridge our intro and geochem sections with Tea Time, where Mark shares a memorable airport security story and Sam offers one of her favorite travel hacks.

For Episode 51, the tables are turned as Imdex Chief Geologist and Technologist Dave Lawie takes over hosting duties and puts Sam in the hot seat.
Fresh from the SME Current Trends in Mining Finance conference in New York City, Dave and Sam discuss the growing disconnect between how mining projects are evaluated financially and how they actually behave technically. From resource models and geometallurgy to critical minerals, permitting, and project risk, they explore why geology, mineralogy, metallurgy, and geochemistry remain central to project success.
The conversation also looks at Sam's path into geochemistry, the origins of GeOCHemISTea, and the role mentorship has played throughout her career.
How Sam found her way into geochemistry
Why technical risk is often overlooked in mining finance
The realities of critical mineral recovery
Geometallurgy, mineralogy, and project valuation
Where AI may (and may not) help the industry
Why mining needs better conversations between technical and financial teams
A candid discussion about the assumptions, risks, and opportunities that sit between a discovery and a successful mine.
SME Current Trends in Mining Finance Conference
Imdex
LKI Consulting