History & Geology
ICMJ Visits Sumpter Oregon, Gold Mining Town
October 2023
Why Did This Silver Mine Close? - Pt III
Narrowing down a closure date will allow you to check the commodity price during that time and possibly confirm that a low price, rather than a lack of ore, was the driving force that closed the operation.
Enrichment of Mineral Deposits by Weathering—Part II
While both zinc and lead deposits also are enriched by the surface weathering process, in part two we will look at the enrichment process for copper and also gold deposits, and at the interpretation of leached outcrops to figure how rich the concentrated deposits below them may be.
Potholes and Other Bedrock Traps
Potholes in bedrock can trap placer minerals and even be glory holes. They are, at least, interesting geologic phenomena, and at best, a treasure trove of gold nuggets.
ICMJ Visits Colfax, California
February 2023Hard Rock and Placer Gold of Manhattan, Nevada
He found 5 to 7 feet of gravel containing half an ounce per yard. This started a rush of placer activity and several other shafts were sunk, with some large multi-ounce nuggets being found.
The Potholes—California’s Oldest Known Mining District
Every time we prospected here we found gold, sometimes some really coarse flakes, but no large nuggets (yet).
The Batteries Metal Rush
There is a major change coming in the economy of the world and now is the time for prospectors and miners to grab a ticket and get on board.
Subscription Required:
Sampling Mission in Placer County's Last Chance Mining District
• Discovering Nugget Hollow
• Google Earth Pro for Prospectors and Miners
• Finding Gold - Fact vs Fiction
• A Hole In One
• Drilling Down - Looking With Drill Bit Eyes
Free:
The Bawl Mill
• Legislation and Regulation
• PLP Update October 2023
