Gold Depositiion and Gradients of Placer Streams—Part II
July 2012 by Jim HalloranThe steeper the gradient is, the more potential erosive power to move gold and other bedload sediments, and the more power to remove obstacles to flow.
Quiz yourself about the stream in figure 5. Based on your previous knowledge of where gold is found in a stream and in this article, where do you think you will find the most gold?
There were some exceptional times in the far-flung history of the West. Rich finds of minerals that set men’s souls ablaze. From the rich gold fields of California, men who arrived too late to find riches went searching in every direction. The trail that we will follow leads east, past the shining silver district of the Comstock Lode.
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.
Confluences of placer streams are well known as concentration sites for heavy minerals. The basic reason is that...
In 1877, a prospector named Ed Schieffelin discovered silver in “the middle of nowhere” and staked two claims: “Tumbstone” and “Graveyard.” Soon a town and mining district were organized and acquired the name “Tombstone” after making a spelling correction.
There is reason to believe these stream valleys are still rich with gold, silver and copper.
Contacts, faults and zones of weak rock are all places that can act as a pipeline to convey gold-bearing fluids, leading to valuable deposits.
The Bawl Mill • The Life of an Independent Prospector • Gold in Guyana—Part I: Porknocking on the Puruni River Road • That Something Extra • Prospecting for Copper Ores—Part II • Metallic Trash—Scourge of the Prospector • Gold Mining Boom in the Carolinas • California Suction Dredging Update • Mine, Baby, Mine! • Hecla to Reopen Lucky Friday Mine • Nova Scotia Shows It's Serious About Jobs & Mining • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices