Neil Ringdahl is a fourth-generation South African mining engineer who has spent decades building and running mines. He evaluates projects like an operator, not a promoter. He typically looks at tonnage, grade, recovery, cost, logistics, and execution risk. In this conversation, you’ll get a rigorous, plain-spoken framework for using MREs properly (what they are and aren’t), when they should be published, how to triage a new resource (cut-off discipline, measured/indicated vs. inferred), what metallurgy and payability red flags actually matter, and how drill PRs and weak QA/QC can mislead. He walks through back-of-the-envelope valuation (geometry → density → recoveries → realistic unit costs → scenario cases), stresses that Phase 1 must pay for itself, and uses concrete examples to show how to separate buildable mines from stories. This is more of a practical checklists with quotes you can use and heuristics you can apply on the next news release, not a cheerleading contest.

TLTW

1. MREs are a yardstick, not a mine plan.
   Mineral resource estimates standardize tonnage, grade and confidence so speculators can compare projects, but only a minority progress to construction. Time, capital, permitting, social licence, metallurgy and feasibility kill many on the way from resource to reserve. Improving prices or technology can revive marginal rock later. Treat an MRE as step one in de-risking, not a proxy for NPV.
2. Judge buildability, not headlines.
   Start with tonnage × grade, then interrogate mining method, process route, water/power/logistics/altitude/climate, etc. Low grade raises capital intensity and execution risk. Cut-off grade = break-even on operating + sustaining costs. It is often looser at resource stage and tightens at reserve. Do economics on measured/indicated, and treat inferred only as upside. Market reaction to a study is a signal about execution risk.
3. Metallurgy, metallurgy, metallurgy.
   Mineralogy dictates recovery and whether you can make saleable concentrate. The most common red flags are; refractory gold (sulphide-locked or carbonaceous), penalty elements (such as arsenic), fine-grind liberation in some VMS, and cross-float in polymetallic systems. If concentrate specs (say Zn <40 to 50%) aren’t met, payabilities can be too low to make money off. Read the test-work section and its recommendations, as the caveats who usually live there can make or break a project.
4. QA/QC is not boilerplate.
   You should actually read the news releases that come before the MRE more diligently than the formal MREs, as they often lean on drilled width rather than true width. They may also include intervals that let a hot metre inflate a 10-m headline, and grab/channel samples that are non-representative. Uncapped assays in nuggety systems can mislead, too. Independent QPs help, but you should still read the full tables (collar, azimuth, dip, intervals) and, if possible, reconstruct geometry. Without credible QA/QC, none of the numbers travel.
5. Phase 1 should pay for itself.
   Estimate volume from intercepts, apply realistic density (soft ~1.8; competent ~2.7), average true-width grades, choose plausible mining/processing costs, multiply by recovery and conservative prices, and run upside/base/“what-if-wrong” cases. The first build must stand on its own (e.g., Rio2’s water-trucking math was feasible at Phase 1 scale). Look for operators and teams that have executed in the past. Speculation is a casino, and there is no crying in the casino. Reduce the chance for tears by quantifying risk using that formula.
   
   Again, the formula goes as follows: Volume * Density * Grade * Discount Factor

Mining Engineer Neil Ringdahl Interview

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