The Significance of Nuggets in Placers
January 2016 by Jim HalloranChances 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 whole purpose of sampling mineralized ground is to measure the values in a small volume of material that would be representative of a much larger volume of similar material. The key word is representative. Chemical and fire assaying will not accurately represent placer deposits by themselves.
Palladium may well be an underexplored element and therefore an opportunity for prospectors and geologists. This is because they are often less than obvious and other than the native metals, a chemical analysis of samples is required to identify PGM-enriched rocks.
At first we decided to see what the flat by our camp would produce where the old-timers had worked it with their Pelton wheel and dragline buckets.
Within this area, about two million ounces of gold and fifty million ounces of silver have been mined. Faults, dikes, veins and fissures that carry the ore form a concentric radial pattern—like spokes on a wagon wheel—around the caldera core.
Plumas has been historically rich in gold because of its favorable geology. The Melones Fault trends north-south through the county and many rich gold-bearing districts lie along its course.
All locations gave up some gold, but one particular section of exposed bedrock with steep, packed crevices kept giving us good, consistent results. We had found our spot.
The placer deposits of Utah occur in two distinct types of environments. These are 1) placers found adjacent to, and derived from, gold, silver and base-metal deposits; and 2) placers found in major rivers and derived from unknown, distant sources.
The Bawl Mill • Ask The Experts • Ask The Experts • Ask The Experts • Ask The Experts • Detector Prospecting Accessories • Electrum: Gold and Silver Together • Drywashing Arizona Gold • Mineralized Faults and Contacts in the Search for Gold • Sunshine and Gold • A Successful Trip Through Gold Basin • Oregon Miners File for Summary Judgment • The Strange History of the Utica Mine • Forest Service Seeks to Lock Miners Out in South Dakota • Maitland Bar Nugget to Go On Display • Company Says Central Idaho Project Feasible • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices