Ask the Experts
April 2014 by Chris RalphBismuth oxide for assaying?
Because quartz and gold may be deposited together across a considerable range of temperatures, not all quartz veins are the same, and there are several different types of gold-quartz deposits.
The zone of influence of each sample must be carefully considered when deciding how far sample sites should be spaced from each other.
The very first thing to find out...is if the detector has the ability to be ground balanced.
…as an academic argument, when mated to the appropriate engine, is the pump really moving water at the rate of 400 GPM?
Ditches almost always started in the high country and contoured the mountainsides, making a long drop, usually many miles away, to the goldfields. There are ditches in Trinity County that originate at seven and eight thousand feet in the Trinity Alps that carried water almost thirty miles.
The fine art of panning heavy sands requires a measure of patience. If you enjoy panning gold, you ought to enjoy this too, once you get the hang of it.
This explains the large difference in particle sizes between placers and hydrothermal lode deposits, but also means that while the mining may be similar in some cases, the sampling and recovery techniques are usually quite different.
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