All Articles
Cedar Rim Opal—Discovery of a Giant Opal Field
October 2008 by W. Dan Hausel
In 2003, I initiated field reconnaissance of an opal deposit at Cedar Rim in central Wyoming and was amazed at the size of this undocumented deposit located right in the middle of an oil and gas field...
Placer Testing with Large Samples
Of all the difficult gold placer sites to evaluate, none can compare with trying to dig to bedrock through twenty or thirty feet of soaked overburden through which water is slowly seeping downgrade.
Molycorp Minerals Reopens Mountain Pass Mine
During the great uranium rush of the late 1940s, thousands of prospectors spread out all over the western United States sampling rock outcrops for traces of radioactivity.
Northern Dynasty Chooses Partner for Pebble
The Canadian company that owns the Pebble Mine prospect has partnered with Anglo American to develop the Pebble project in Southwest Alaska.
Crushing, Grinding and Pulverizing
There are many different ways to get the gold out. We will take a look a few examples of crushing and grinding, and potentially which ores they may be best suited for.
Drywashing for Eluvial Gold in the Desert—Using a Portable Drywasher and Hand Tools
Often the gold being recovered by drywashing is too fine to be recovered by metal detecting. For every “detectable” nugget found, there could be hundreds of smaller flakes of non-detectable size. Thus, for those that “read the ground,” and snipe for areas of favorable placer concentration, drywashing will continue to be both an inexpensive...
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