Internal Laboratory

Fire Assay

Fire assaying has been practiced since ancient times and has proven to be very reliable in the determination of precious metals. The procedure follows the main steps of weighing, fluxing, fusing, pouring, cupellation and parting. 


Just Refiners USA Inc. is now equipped with it’s own internal fire assay laboratory. JRI’s fire assay laboratory has taken great care to set up a structure that allows it to proceed with the main steps of fire assaying in an orderly fashion. This structure has resulted in superior accuracy and has yielded more settlements without umpire. 


JRI’s ability to run assays in house means more timely results and in turn means more timely payment to our clients. 

Hazardous Materials Monitoring

JRI’s Internal Laboratory utilizes state of the art amperometric and mass spectrometric analytical analysis equipment to assess the presence and concentrations of potentially hazardous materials such as cyanide and mercury within mining by-products, ensuring a safe work environment along with proper, ethical waste management strategies.


Just Refiners has carried out extensive research and monitoring on spent carbon with various levels of mercury. Every stage of the carbon treatment at JRI is monitored for mercury.


 The JRI laboratory analysts take vapor samples at random. Each mercury reading is recorded and filed away for due diligence and control purposes. If at any point excessive levels of mercury are detected the processing is halted for the safety of the employees.


On occasion, the mercury monitor will record a spike in the mercury readings. This spike has been proven, however, to be directly related to elevated temperatures in and around some of the processing equipment, rather than elevated mercury.



At Just Refiners USA Inc. we are dedicated to the highest accuracy, safety and efficiency standards in everything we do. 

Deleterious and Other Elements

Just Refiners is able to use multiple techniques to run scans for deleterious elements with the purchase of the following instruments:


AA: Atomic absorption spectroscopy (AAS) is a spectroanalytical procedure for the quantitative determination of chemical elements using the absorption of optical radiation (light) by free atoms in the gaseous state.


In analytical chemistry the technique is used for determining the concentration of a particular element (the analyte) in a sample to be analyzed.

 JRI is now equipped with two ICP machines in order to increase our volume.


 (ICP-OES): Inductively coupled plasma atomic emission spectroscopy.


(ICP-AES), also referred to as inductively coupled plasma optical emission spectrometry.


 XRF (X-Ray Fluorescence Spectroscopy): The measurement of fluorescent x-rays emitted from a sample when excited by a primary x-ray source. 


With the XRF machine JRI is able to scan a sample and immediately have a broad idea of the properties of said sample. The XRF is a good indicator of what we can expect from the fire assay. 

Bobby Boekhoud
Beve Boekhoud
Carmen Arbizo
Marco Barragan
Logan Zimmerman
Kim Walker