Gold Fire Assay by Microwave

Gold Fire Assay by Microwave

The deluxe Homemade Gold Smelter is our best microwave kiln kit and includes:

  • 9.5″ tall x 8″ square refractory kiln with kiln shelf
  • Custom refining flux
  • Graphite 2 depression conical assay mold
  • (2) 40 gr ‘1 shot’ clay crucibles
  • (1) 150 oz fused silica melting crucible
  • 18″ tongs
  • (1) stainless steel stirring rod
  • Instruction manual & smelting tips
  • Chamber is 6″ tall x 5″ diameter.

Requires a 1200 watt microwave with 10″ inside height clearance.

The fused silica melting crucible is a high quality crucible and is the best choice for melting larger and purer amounts of gold, silver, and bronze, including old jewelry. Made of fused silica with clay bond, for temperatures up to 2500°F (1371°C). Must be pre-glazed before smelting (instructions included).usa manufacturer

If you are new to this method, use the ‘one shot’ crucibles until you become familiar with the process, as they are more economical to replace than the fused silica crucible.xrf -



Prospectors, are you tired of the tedious process of separating the fine gold from your black sand concentrates? Or, saving it and watching the pile grow, not knowing quite what to do with it? If only there was an easier way to extract it.

Well now there is – burn it! Yes, you read that right. Keep the nuggets and pickers and smelt the rest! This Microwave Homemade Gold Smelter is designed and built especially for you. Whether you are a serious prospector, or a weekend enthusiast, this method is sure to grab your interest – and your gold!

homemade gold smelter

The Microwave Kiln is simpler, less expensive and far less tedious – not to mention, more fun – than other processes, such as spiral panners or fine gold tables. All you need is a 1200 watt microwave, a few tools and you are on your way to smelting your own gold at home!

Much research and experimentation has gone into the design of this kiln, to ensure the best results for separating fine gold from black sand and ore concentrates – and for melting down old jewellery. The stacked or layered design allows for replacement of damaged pieces, in the event of spills, while the kiln can be rearranged and stacked to different heights, according to the size (height) crucible used.

Advantages of a Microwave Assay Furnace

  1. Variable kiln heights possible, for crucibles of different heights
  2. Replaceable parts
  3. Simpler process
  4. Less expensive
  5. Less tedious
  6. More fun


Sensor or Inverter microwaves will only operate at high power for approximately 30 minutes. After 30 minutes or so, the microwave will reduce the power output to 80% and begin to cycle the magnetron on for 20 seconds, then, off for 10 seconds. You cannot reach smelting temperatures operating on lowered power output like that in a reasonable time frame. Simply stopping the microwave and resetting the time and power level will not force the microwave to operate at the full power output mode.


  1. Program the microwave timer for 30 minutes. Set the power level to High or 100% and start your microwave.
  2. Stop the microwave after 29 minutes and UNPLUG the microwave for 5 seconds; this clears the memory on the controller board.
  3. Plug the microwave back in and program the timer for an additional 30 minutes and set the power level to High again
  4. Start the microwave and listen for the hum of the magnetron for a few minutes. If the magnetron does not cycle on and off, the microwave is operating at the preferred full power level.
  5. Elevate the microwave a couple of inches off the surface and place a small fan behind it to dissipate the heat coming from the microwave and help keep the magnetron cooler while operating.

This will allow the microwave to operate at full power for the recommended 60 minutes smelting time and reach the temperatures necessary for successful smelts.

Weight22 lbs
Dimensions18 x 12 x 12 in

Microwave Fire Assay Furnace Kits

complete_metal-melting-kithomemad fire assay kit
homemade-fire-assay-furnacemicrowave fire assay furnace
microwave fire assay furnace with mold and fluxmicrowave-assay-furnace
diy-microwave-muffle-furnacefire assay flux tongue crucible and furnace
small microwave assay furnacemini-microwave-kiln

You may also like…

I Need Assistance