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Huge Opal Sells for Nearly $144k at Alaska Auction

The opal is larger than a brick and is broken into two pieces, which von Brandt said was a practice used decades ago to prove gem quality.

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Looking Back


Excerpts from California Mining Journal, our original title, published 50 years ago this month.

The American Hill Mine


In the high country of the Tahoe National Forest is 160 acres of a patented mining claim dating back to its origin around 1853. This is well above the historic mining town of Michigan Bluff and past Deadwood—an old mining town...

Ask the Experts: Ionizing mercury


Q: What exactly does "ionizing" mercury mean?

The Klamath Mountains


Over 7 million ounces of gold have been produced in the Klamath Mountains of northwestern California, 64% of which has been from placers.

Ask The Experts: Could you expand on your previous blasting article?


Q: Could you write more about the last two methods that you mentioned—the expanding chemical mixtures and the micro blasters, how and when to use them, and when not to use them?

The Guyana Highlands


The Guyana Highlands referred to here are a tropical upland area that extends from French Guiana on the east to Colombia on the west, with elevations reaching 9,219 feet. It occupies a vast and remote region between the Orinoco River on the north and the Amazon River on the south. There are mountains, tablelands, mesas, and swamps, largely impassable to those on foot.

Revisiting the Rocker Box


The first location we worked was a small, dry ravine cutting through many mineralized zones in an area where some hard rock mining had taken place in the past.

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