Detecting Invisible Gold
April 2009 by Chris RalphThe 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...
Highway 49—the “Golden Highway”—heads northeast out of Placer County into a stretch of Nevada County that is almost as busy as it was during the Gold Rush. The neighboring towns of Grass Valley and Nevada City are still booming—a beautiful location to live in the Sierra foothills.
How many more clays seams lie adjacent to known shear zones and quartz veins in the pocket areas of southwestern Oregon?
I decided to focus my attention on some exposed bedrock that was along a little stream only about 100 yards from our cabins. My very first pan full of gravel showed several nice small flakes that were just big enough to be picked up with my fingers. That first pan showed that indeed there was some very nice gold to be had here...
The potential exists for small-scale placer mining in these pits using a trommel and sluice box or other similar types of equipment.
One of the world’s largest kimberlite pipes is located on the Navajo Indian Reservation in northern Arizona. The pipe is larger than any diamond-bearing pipe in South Africa. It is 16 miles north of Window Rock, the capital of the Navajo Nation.
Every placer miner has to deal with it in one form or another, and some locations have it far worse than others, but nearly every placer has at least some of it: black sand. It collects in our concentrates and gets in the way of recovering our fine gold.
T. Lyle Taylor
Jan. 2, 1945 - Jun. 18, 2004
The Bawl Mill • From The Editor • Finding Diamond Deposits With Your PC—Part I • Has Senator Harry Reid Worn Out His Welcome? • The Most Obvious Place • The Gold of Yuba County • PDAC 2009 Convention Highlights • Stimulus Package Provides Potential Tax Savings For Miners • Melman on Gold & Silver • Mining Stock Quotes, Mineral & Metal Prices