Small Mining Operations
Resurrecting An Old Hard Rock Mine—A Series of Small Victories
February 2019 by Ron Kliewer
…we cheered and high-fived each other as the ore cart slowly crested the top of the headframe, then picked up a bit of speed on the short downhill section and came to an abrupt halt, ejecting its contents of ore…
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.
Bering Sea Gold—Part II
In last month’s issue we covered the initial discovery of gold, the subsequent gold rush that occurred around Nome, some of the geology of the area and past production. We’ll conclude the article in this issue with a further examination of the geology and deposit types, discuss the resources...
Critical Minerals: Titanium
The metal is expensive, not because it is rare but because of the expense to produce and work it. The minerals mined for titanium are all oxides, unlike many base metals that are mostly mined as sulfide minerals.
Ask The Experts
• Making a noisy dredge more quiet
Gold Recovery with Centrifugal Bowls
Centrifugal bowls are very efficient, and with proper operation they can consistently achieve gold recoveries above 95% with gold of about 50 mesh size.
Proper Assaying of Placer Samples
The whole purpose of sampling mineralized ground is to measure the values in a small volume of material that would be representative of a much larger volume of similar material. The key word is representative. Chemical and fire assaying will not accurately represent placer deposits by themselves.
Placer Channel Sampling
Sampling gold placers can be rewarding, but remember to treat the samples so you are not high grading or low grading your results. Learn the rules and apply them so your samples are accurate.
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The Bawl Mill
• Ask The Experts - Do I need something other than a fire assay for PGMs?
• Ask The Experts - This low-grade ore is not worth processing
• Placer Gold Deposits of New Mexico
• The Hunch
• The Basics of Exploration Leases and Contracts—Part I
• Gold Prospecting for Better or Worse: A Long Hike
• Mutiny on The Mason
• Who Jumped Whose Claim First?
• The Value of Evidence
• Over The Divide: Charles "Chuck" Cushman
• Melman on Gold & Silver
• Mining Stock Quotes and Mineral & Metal Prices
