Selenium, Mercury and Suction Dredging—Studies Contradict CA State Water Resources Board
April 2013 by Scott HarnFederal and state regulatory agencies often cite mercury and methyl mercury in our waterways as a major factor for further restrictions on placer mining, and on suction gold dredge mining, in particular. However, these regulatory agencies are minimizing selenium and its neutralizing effects.
My last update on this adventure was in the April 2012 issue and involved our search for the northern extension of the Cedarberg Mine. At that time we had found it and we were in the process of returning for some detecting when Mother Nature struck with a late rain and snow storm.
After removing about six inches of dirt and cobbles, the sound was a bit more recognizable. I was now confident that there was a definite target and not just a ground noise.
I’m sure we all have, at some point in time, gone out detecting and ended up not having the success we thought we would have. Here are some helpful game-changers that work for me and may work for you, as well.
NOI or POO for small backhoe
When I teach people about finding gold, I often explain that it is helpful to think of any river or stream that carries gold as being something like a sluice box.
I picked up a noticeably heavy, fist-sized chunk of what I thought was a heavy piece of iron. After wiping some of the dirt and clay off, I still didn't know what on earth this object was.
Our theory was that a dredge would collect far more material in a shorter period of time, leaving us with ounces of gold every day.
The Bawl Mill • Ask the Experts - processing plants that can extract rare earth metals • Ask the Experts - what does MDB&M stand for? • Ask the Experts - proper mining claim procedures • The Hughes Creek Placers, Montana • Benefits of a Detecting Partner • Excavator Testing Wet Placer Ground • Hard Rock Milling: A Matter of Scale • Paperwork Guy—A Cautionary Tale • ICMJ Online Forum Now Available • Detecting For Gold—Are You Up For It? • A Trip Down the Yukon River • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices