All About Hard Rock Drills

July 2021 by John Norman

There are three basic power sources for rock drills—electricity, gasoline and compressed air. Before we go into big pneumatic drills, we’ll start with a quick rundown of each.

The Heavy Minerals in Your Concentrates

June 2016
The fact that mineral deposits can contribute specific types of heavy minerals is why the analysis of the heavy mineral concentrates in the streams of an area can be an important prospecting technique for finding undiscovered mineral deposits.

Gold in Guyana—Part I: Porknocking on the Puruni River Road

July 2012
In part one of this two-part series on gold in Guyana, I describe artisanal mining efforts currently winning alluvial gold from small-scale placer operations located along the lower Puruni River and its tributaries.

The Highs and Lows of Drywashing

August 2016
We were met with a plethora of mechanical problems with the dry washer and even a few with the excavator that were at times frustrating, but we were in this for the long haul, so we needed to solve these problems and move forward.

The Importance Of Mining Critical Minerals In The USA

March 2019

Critical minerals are products that the government has designated as critical to our national interest because of both their potential military and industrial applications.

The Smell of Gold -- Part II

July 2015
While mapping, I also found rock chips in the soil that were characteristic of the same wall rock alteration that occurs adjacent to the known lodes in the greenstone belt.

Wyoming's Billion Dollar Nugget—The Trilogy Ends

July 2011
With eight loads processed, a pumpkin-size rock fell into the hopper, stopping the whole operation until I could lift it out.

Wilfley Tables—Repair, Rebuild & Set Up

September 2014
I researched the Internet and found a number of table makers, but technology has changed in the last 25 years. No one could sell me a kit for a new deck with wooden riffles...

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