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Underground Mining: Stoping Methods


In an old mine that does not have stopes, you know the old miners did not take much if any ore out of that excavation. On the other hand, if you see large stopes within the mine you know that it is these places where the miners found profitable ore deposits within the vein.

Digging It Dry


I believe dry washing is an underappreciated prospecting method. There are plenty of places where there is some pretty decent gold to be had, but the spot is a long way from any water and dry processing may well be the best way to go.

Dredging Therapy


The big moment finally arrived. With Norm suited up, I pulled the motor to life and felt instantly better. There’s really something relaxing about the sound of a dredge running—they don’t sound like anything else.
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Moving The Big Rocks


The anticipation of finding out if the system of snatch blocks, shackles, chokers, anchor points, and the strap binding the massive slab of rock in the bottom of the river would even budge an inch was weighing on me. 

The Seven Troughs Mining District


The favorable geology of the northeastern and central parts of the Seven Troughs Range are the parts most interesting to prospectors. They are underlain by a thick sequence of Tertiary volcanic rocks, mostly rhyolites and andesites.

The Highs and Lows of Drywashing


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.
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A New Method for Handling Stubborn Gravity Middlings


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

Ask The Experts


Q: How do I improve my small-scale mining operation’s gold production?

The Heavy Minerals in Your Concentrates


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.
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Care and Lubrication of a Model 13 Laboratory Wilfley Table


A Wilfley table works best when all of the mineral being run across it (the pulp) is about the same size.  For this reason, I took a good look at each of the samples.

Progress Continues in Honduras


He had meetings with Honduran officials at all levels, set up a new corporation called Raptor Mining in El Corpus, Honduras, and is in the process of establishing a non-profit called “Step Up for Honduras.”

Dry Washer, Wet System or Metal Detector?


I love to dry wash old nugget patches found by detector operators, and I have found my fair share of gold dry washing those areas. I have also found a few nuggets using a detector on the bedrock exposed by dry washing the patches.
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Charles P. Watson, Chief Geologist

How to Stake Your Own Mining Claims—Part II


I’d like to offer some practical comments about staking and maintaining mining claims. Owning your own claim is the dream of many prospectors. I’ve made good money off my mining claims, both from the minerals I have found on them as well as from leasing out some of my claims to larger mining and exploration companies.

Ask The Experts


Options for affordable crushers for small mining operations

Ask The Experts


How do I set up a Miller table?
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Addressing EPA Overreach: What Dredgers Need to Know


The Environmental Protection Agency (EPA) has been attempting to extend their authority and intimidate miners and other public land users for decades. Suction gold dredgers are no exception, and we want to highlight a recent example of how to deal with this federal overreach.

Ask The Experts


Any good books on mineralized faults and contacts?

Gold in Quartz


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.
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Northwestern Alaska Mineral Resources


Gold and jade are actually only minor mineral resources for the Northwestern Alaska region as a whole. Modern prospecting has focused more on base metal than precious metal resources.

The Fire Assay of Carbon


Carbon, activated charcoal, or “char,” as some old timers refer to it, can be an assayer’s nightmare.

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