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Detecting Invisible Gold

Olinghouse gold specimen.The technology certainly has improved quite a bit over the years, so when these owners are testing various types of gold on their machines and they find that some gold responds poorly or not at all...

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Principles of Designing Your Mill Production System, Part II: Mill Design


Starting small with quick profitability gives you a lot of financial elbow room plus real-world experience that can be used for final mill design.

A Few Methods for Sampling Hardrock Deposits


With a little homework and a methodical approach to sampling, a prospector can determine if a deposit is worthy of more of an investment...

Picks & Pans: Koyukuk River Gold—Prospecting Alaska's Brooks Range


The water rose up in a great splash around the front of the pickup. The tires smashed into a couple of large boulders and suddenly the truck nosed down into a deep hole and bounced back out as I stepped on the gas pedal.

North Korea Seeks Outside Help to Modernize Mining


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San Manuel Mine Officially Closes With a Bang


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The Bawl Mill


• A breath of fresh air?
• Ay Carumba!
• Principal pours it on a little too thick...

Mining Companies Use Conservative Valuations


Gold mining companies are being conservative in asset valuations despite recent spikes in gold prices in terms of US dollars, according to a survey by PricewaterhouseCoopers.

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