Drywashing for Desert Gold—Part III
April 2021 by Dan Stanton
If the material drops down out of the hopper too fast, it can overwhelm the riffles and you can blow the gold right out. If it runs too slowly, the riffles can clog up and the process is too slow.
As the ground thaws and dries out and the warmth of spring starts to settle in, it’s time to start afresh with a new prospecting season.
NOI or POO for small backhoe
Let’s set up a thought experiment: Suppose you had some material that ran one ounce per ton gold, which is generally considered high grade to fantastic grade depending on the circumstances.
Doug told me that there had been a 100-year flood that took place in October of 2013 and it washed out part of the mile-long landing strip. It also washed a large, wide gully down below and above the camp.
While recovery rates are important, they must necessarily be secondary to the volume of material processed. Running more material at lower recovery rates is generally preferable to increasing the efficiency of the system.
There is always an overwhelming feeling when finding gold of any size, but one like this doesn’t come along very often.
Chances are better that both types of gold did not come from the same source. Let's look at the probable conditions to cause two types of gold in a placer.
The Bawl Mill • Ask The Experts - What is the “blue lead?” • Ask The Experts - Can an Ohm meter find gold in pyrite? • Ask The Experts - Can you tell me about this mining district? • The 10-Ton Boulder: Expanding Grout Demolition • How Deep Can That Detector Go? • Simple Mine Surveying With Basic Hand Tools • Dredging Do's and Don'ts • Emails Confirm--FBI Was Looking for Gold at Pennsylvania Dig Site • Gold Prospecting for Better or Worse: Tuck and Roll • Preparing For The 2021 Mining Season • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices