How Mesothermal/Orogenic Gold Deposits Form
August 2021 by Chris Ralph
These deposits are very widespread across the planet. In fact, they are so extensive that something around 75% of all the gold ever mined comes from these types of deposits (if one includes the placer deposits that also formed from them).
I couldn’t wait to get started. With no field budget, an assay budget of $100/year, a 1975-Ford Bronco that was a road hazard, a gas card, a topo map and full support of the director, I headed to the State Line district near Tie Siding along US Highway 287 to begin mapping kimberlite.
Geology is a science of general tendencies with frequent exceptions, not one of hard and fast rules that are always true and never vary. For almost every well-accepted rule of gold deposits, I can point you to a number of important exceptions.
Liberty, Washington is located in the mountains near Yakima and Ellensburg. There is nothing much in Liberty except for about 20 houses on patented mining claims and a lot of dry holes.
Prospectors often wonder why gold deposits in veins like it does. Why is one vein rich while another is barren, even though they are only a few hundred feet apart?
Congress decided that if they shared the riches of our lands with the people, we would colonize and expand the states at a much faster pace, thus the birth of public lands and mining claims in America.
• "...just about more than I can stand."
• "I hope you can answer my number one question..."
• "...I still go out and mine a little at my old stompin' grounds in Siskiyou County..."
• "...New Prospecting Club in the Southeast."
• "...9 ounces...in two weeks."
• "...It's no secret..."
The majority of the gold produced in Goldfield has come from ores that are close enough to the surface to be oxidized by the air. This oxidized ore is normally a soft, shattered, earthy material usually stained yellow to brown by oxides of iron.
The Bawl Mill • Ask The Experts - Are pulse induction detectors the right tech for gold? • Ask The Experts - Why can’t I find gold with my detector? • Ask The Experts - Are two rock crushing machines (jaw crusher and chain crusher) necessary? • Ask The Experts - Why am I finding only coarse gold, not fines in this area? • Ask The Experts - Is the amount of gold reserves claimed by mining companies real or just hype? • How To Identify Minerals • Chasing Hard Rock Gold As A Placer Deposit • Gold Prospecting for Better or Worse: Bumbling Through A Gold Bonanza • My Explosive Introduction to Gold Mining • Georgetown CA: A Historically Rich Mother Lode Treasure • Reminder: Annual Claim Filings and Fees Due • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices