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Large Scale Mining

Drilling for Ore

In the simplest sense, drills can be divided by their mode of action—percussion, rotary or a mixture of the two.

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How to Refine Silver—Pt I


Silver refining has been used from ancient times to change the characteristics of the metal. Early metallurgists refined silver by heating it a couple hundred degrees above its melting point and holding the metal at an elevated temperature for a period of time.

Prospecting for Silver Deposits


In some ways, silver is the forgotten precious metal because it straddles both the world of precious metals and jewelry, while having many important  industrial applications like a base metal. The price of silver reflects both the precious metal investment demand as well as the industrial demand.

Canadian Company Recovers 1,111-Carat Diamond


It is the second largest gem-quality diamond in history, after the 3,106-carat “Cullinan Diamond” was recovered in South Africa in 1905.

Legislative and Regulatory Update


  • NEPA comments due
  • Update on latest US Supreme Court suction gold dredging appeal
  • Washington State tries to restrict suction gold dredging

Thieves Make Off with Tons of Gold & Silver Ore


According to local press reports, about ten armed thieves forced their way into a private freight dispatch yard near the port, subdued employees, and then took several hours to search for the shipping containers…

Soft Rock Excavation Techniques


Care and Lubrication of a Model 13 Laboratory Wilfley Table


A Wilfley table works best when all of the mineral being run across it (the pulp) is about the same size.  For this reason, I took a good look at each of the samples.

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