Prospecting & Detecting
Proper Spacing of Placer Sample Sites
September 2013 by Jim Halloran
The zone of influence of each sample must be carefully considered when deciding how far sample sites should be spaced from each other.Mom Finds 3.72-Carat Yellow Diamond
“Much of the ground where Ms. Hollingshead found her diamond is made of unweathered volcanic rock. When it rains, flowing runoff often leaves loose gravel, and sometimes diamonds, on the surface in these areas.”
A Good Start
We split up in order to cover a larger area and found good color almost everywhere. The bedrock was shallow on both sides of the river, but the inside bend was where we concentrated our prospecting.
Sampling Placer Stockpiles
Sampling other people's stockpiles or dumps has some inherent risks that sampling undisturbed ground does not have.
How Should I Work This Prospect?
How big is the deposit? Are there boulders you will need to move? Do you just want to recover the nuggets or do you think there is good fine gold that you will also want to capture?
Following Clues to an Old Mill and Vein Strike
My last update on this adventure was in the April 2012 issue and involved our search for the northern extension of the Cedarberg Mine. At that time we had found it and we were in the process of returning for some detecting when Mother Nature struck with a late rain and snow storm.
Pinpointing for Gold
This rock had been with a family for many years and they were cleaning up an old workshop that had lots of minerals and miscellaneous “ore” samples.
Cold Alaskan Gold—Part II
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...
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