The Furnace Atmosphere During the Fire Assay
January 2001 by Dr. Ralph E. PrayIt has been claimed that the introduction of excess air to the assay furnace during sample fusion can materially increase the gold yield. Testimony by expert witnesses for the defense in recent federal hearings dealing with the dependability of the gold fire assay includes data purported to show this.
So much of gold detecting depends on attention to detail. Every gold area offers its own distinct geological markers and as prospectors we must pick up on those markers.
• Recovering platinum
In some places valuable ores can be found within the waste material of mine dumps, sorted ore piles, and detrital vein matter at the surface. Though many of these old mine sites can be an excellent source of gold, not all are created equal.
"Suh-wheet!" I exclaimed as I sprang to my feet and quickly pumped my detector coil high overhead to alert Smokey that I had just found a nugget.
Perhaps no one factor has caused more confusion in the search for ore than the attempt to use color as a guide to prospecting. Yet, there is a reason for every color seen in rocks, so it deserves to be noted.
Follow the chain of letters between everyday prospectors Robert and Lesa Barton of Oregon and Deputy Regional Forester Linda Goodman.
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