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Michigan Approves Nickel, Copper Mine

Regulators gave final approval to a nickel and copper mine for the Upper Peninsula.

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Gold, Quartz & Chalcedony—Part II


The specific gravity of chalcedony is 2.58 to 2.64. This is slightly lower than coarsely crystalline quartz because of slight porosity in chalcedony. Being so light, it will easily wash out of a gold pan.

Ruby Hill Gold Mine to Reopen in Eureka


Barrick Gold Corp. is moving forward with the reopening of the Ruby Hill gold mine at Eureka, Nevada, and intends to begin work next month on a new power plant in western Nevada.

Elizabethtown: Uncovering a Buried California Mining Community


Although there are many mining ghost towns in California, it is rare to find the ruins of one that was abandoned 140 years ago and then subsequently buried by hydraulic mining debris.

Rediscovering Placerville, California


Several areas came to mind, but each was eliminated for one reason or another. One that seemed to be hanging on was the old historic mining town called Placerville.

Some Tips and Tricks for Dredgers: Determining Pulley Size and Belt Length


If Epd is larger, then the compressor will be spinning faster than the manufacturer’s maximum specified RPM and might destroy itself. If this happens, then the compressor again might not produce enough air to support a diver. Neither is a desired outcome.

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