W.E. Mowrey Refining

Manufacturing and Refining since 1899

Copyright 2021. W.E. Mowrey Refining. All Rights Reserved.

Gold and Silver Assay Services

Assay is the process of analyzing material to identify the precious metal content.  We have two assay methods:


Fire Assay:  This assay method is the oldest, most accurate, and remains the industry standard to determine gold and silver content.  All lab work is done in-house by highly qualified and experienced employees to ensure accurate and prompt results.  W.E. Mowrey will perform a fire assay for a $50 fee.


X-ray Fluorescence:  This machine is able to scan the surface of an alloy and read its elemental makeup off its x-ray spectrum.  We now offer X-ray analysis print outs for $25, the X-ray fluorescence machine is a great instrument, however it can be susceptible to error and it is not as accurate as a fire assay.


We work to ensure prompt and accurate results.  


What we require from you:


  • Payment upfront.
  • Sample size: 2 grams or more, metallics only.
  • A representative sample.  This is very important.  If the sample is not representative, the result from our assay will be ineffective.
  • If the sample is taken from a bar it is important that is clean and not contaminated. 
  • X-ray Fluorescence samples must be less than 15 lbs and small enough to fit in the machine.
  • We maintain the right to turn down away material or increase the fees is we feel the sample needs additional preparation and work. 
  • Contact us for further information.