What Is Your Grade?

March 2021 by Thom Seal, PhD, PE

After paying for the mine fleet, mill capital, supplies, fuel, power and labor, at today’s metal prices, does this mine make a profit?

Mining for Gold and Sapphires in Montana

April 2014

Fascinated by the sapphires—and the gold that occured with them—he was soon buying parcels of property and setting up his own commercial-scale gravel processing plants.

A New Method for Handling Stubborn Gravity Middlings

July 2016
The solution focused on the relative difference in malleability between gold and waste, rather than the difference in density exploited by gravity circuits.

The Basics of Froth Flotation

June 2015
I thought it might be worthwhile to take a look at the basics of this important mineral separation technique and how a miner can use it to recover the values out of an ore.

Gold in Quartz

February 2016
Because quartz and gold may be deposited together across a considerable range of temperatures, not all quartz veins are the same, and there are several different types of gold-quartz deposits.

California Dredgers: A Step Closer to Getting Back in the Water

June 2014
...Judge Ochoa ordered the parties to participate in mandatory settlement hearings starting June 24, 2014.

Building A Portable Gold Mill

November 2021

Through the milling process, the rock must be crushed and the values extracted. Let’s break down our discussion into the different parts and elements of the mill…

Customizing Your Dredge

January 2013
I am going to suggest dozens of ways you can increase suction power, dredge to greater depths, and improve recovery methods in your sluice box.

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