Garrett Electronics - trusted by real miners & prospectors!

Magazine

All Articles

BLM Runs Check on Assay Services

The Bureau of Land Management (BLM) recently conducted a multi-year study of sixty-five assay laboratories to determine the accuracy of their testing procedures. The laboratories, all located in North America, were provided with ore samples of known concentrations without benefit of identifying the source as BLM. Payment was rendered for the service provided.

Most laboratories involved were sent 4 samples containing known values of gold, silver, platinum, and palladium, and 2 samples that were complex blanks. Prices charged for assay services varied from $60, for fire assays, to $2,250 for a “tin fusion method.” In our review of the report, price did not seem to be reflected as a determining factor for accuracy. In some cases, a lower cost for service provided a more accurate assay.

The results of assays conducted are compiled in a 34-page report, including 16 pages detailing the reasons for and methods used in the study, and 18 pages of results. The volume of the report does not allow for inclusion in this publication, but ICMJ’s Prospecting and Mining Journal has made the entire document available free on our web site:

Study preface (.pdf file) 0.8MB
Study results (.pdf file) 1.0MB

Many of the results published were well within acceptable limits, but some were so far out in “left field” that utilization could be disastrous. Substantial quantities of precious metals were reported in some blanks. Some samples that contained valuable quantities of precious metals were reported as “none detected.”  As a result of this report, several assay labs were barred from advertising in our publication.

BLM should be applauded for conducting this badly needed study, and hopefully they will continue this public service. The resulting report should be a valuable tool as a validation for assay services.
© ICMJ's Prospecting and Mining Journal, CMJ Inc.
Next Article »« Previous Article

Add a Comment

Additional articles that might interest you...

Effectively Using a Detector and Drywasher for Placer Gold


A "How-To" method for small group sniping and reclaiming old placer areas.

Mining Journal Receives Honor


For the 20th consecutive year, ICMJ’s Prospecting and Mining Journal was voted “Prospecting Magazine of the Year”...

Legislative and Regulatory Update


  • PLF files petition with US Supreme Court on behalf of Oregon miners
  • Land and Water Conservation Fund abuse by Forest Service
  • Army asks for REE proposals

The Hanging Tree


The Big Swede was working his pan trying to get rid of the black sand. Usually there were others at the river, but on this day he was there alone. He figured that most of the other fellow miners were either doing their laundry, or working.

Company Notes


• Washington Group Int'l
• Robinson Nevada Mining Co.
• Little Squaw Gold Mining Co.
• Newmont Mining Corp.
• Compania de Minas Buenaventura

Legislative and Regulatory Update


  • EPA declines to impose additional regulations and financial requirements on hardrock miners
  • “Baffling” ruling in suction gold dredging court case

Ask The Experts - What is the difference between heavy and light rare earth elements?


Subscription Required:
The Ball Mill   • Our Readers Say   • WMD Raffle Raises Funds for Lawsuit   • Gold in Alabama   • From the Editor   • Yukon Placer Miners Fighting Extreme Discharge Limits   • Picks & Pans: Red Beryl Mining—Beaver County, Utah   • The Investigation   • A Gold Detector Sitting in a Closet Only Finds Dust—A Potpourri of Detector Tips   • Central Coast Ranges   • Poll: Montana in Favor of Repealing Anti-Mining Initiative   • Platinum in Laccoliths   • Mining Stock Quotes and Mineral & Metal Prices   • Looking Back   • Melman on Gold & Silver

Free:
Legislative and Regulatory Update

Advertisements

Garrett Electronics - trusted by real miners & prospectors!
Precious Metals Recovery plants and equipment
Fighting to keep public lands open to the public
Specializing in the processing of precious metal ores!
Watch prospecting shows on your computer right now
Free Online Sample Issue