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How to Interpret Assay Values


This assay system of ounces per ton sounds simple enough, but the use of the metric system and the additional measuring terms of “grams per ton” and “parts per million” (ppm) has created some misunderstanding of ore value.

Resurrecting An Old Hard Rock Mine—Safety Is No Accident


Now it was time for the nerve-wracking part of the job: actually removing anything from the hanging wall we deemed to be in need of removal because it was either loose, could be loose, looked loose, or we felt it was just downright dangerous

From Curiosity to Mine Owner


His brother’s friend showed him a vial of gold that originated from his family’s mine in Honduras. Within two weeks Ernie had flown to Honduras to get a first-hand tour of the historic mine and the primitive operation underway to recover the gold.

Ask The Experts: Is there a safe DIY alternative to cyanide or mercury for extraction?


Q: With safety as a given, what can the average miner, or Joe-blow greenhorn do to identify and extract some metals or minerals with off-the-shelf products or natural ingredients?

Gold Recovery with Centrifugal Bowls


Centrifugal bowls are very efficient, and with proper operation they can consistently achieve gold recoveries above 95% with gold of about 50 mesh size.

How to Recognize Hard Rock Gold Ores


I regularly get inquiries along the line of: “Hey, I found this rock, and I think it might be gold ore. How can I tell?” Prospectors are always on the lookout for gold-bearing rocks that may be the source of any nearby placer gold.

Using Favorable Rock Types to Find More Gold


The more experienced prospectors know these lesser known spots are the types of places where big finds are still made.

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The Bawl Mill   • Legislative and Regulatory Update   • Ask The Experts   • Revisiting the Rocker Box   • Can You Recognize Valuable Ores?   • Follow Up to "Just One More Time"   • The Highs and Lows of Drywashing   • Successful Detecting Requires Attention to Detail—Part I   • Panning for Gold on Canyon Creek   • China Closing More Than 1,000 Mines   • Habits, Procedure, and Where Is The Gold?   • Exploring A Historic Lode Mine   • Mining Stock Quotes and Mineral & Metal Prices   • Melman on Gold & Silver

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