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 Microwave Gold Processing Kiln & Kit 

Microwave Gold Processing Kit Kit

Looking for a different way to separate fine gold from your black sand concentrates?

Spiral panners and other equipment work, but can be a little slow. Did you know there's another method to consider? Burn it with the new Microwave Gold Smelting Kiln and Kit! Keep the nuggets and pickers and smelt the rest! All you need is a 1200 watt microwave with the magnetron on the side or rear (a magnetron on the top doesn't work as well) that is located out in your garage or shop (don't use the one in your kitchen), a few tools, and you are on your way to smelting your own gold at home! Watch the video first to get an overview of how the process works, then read the details below...

First of all, you must have gold or silver in your concentrates to begin with and the more of it the better. The microwave gold smelting kiln is a tool for smelting only. It does not separate out the precious metals that are in your concentrates. You still need to have your end product called "buttons" assayed to determine its purity and content. You can also use the Microwave Gold Smelting Kit to smelt precious metals from computer parts, from old beat-up coins you cannot sell, from old sterling silver silverware, and from your unwanted scrap gold and silver jewelry (use wire cutters to cut the chains into one inch pieces). You may want to check out our Gold Testing Kits.

Always wear protective clothing and eye protection when using the Microwave Gold Processing Kit! A description of the Kit's main components are as follows:

• The gold smelting kiln is comprised of the highest quality, high density, no-smoke, high temperature refractory ceramic fiber kiln lining insulation available that is microwave transparent (allows microwaves to go through the material). It has been coated with a silica based rigidizer at the factory to improve the compressive strength of the fiber board and to minimize the potential of dusting, and is suitable for applications up to 2300°F (1260°C). The kiln acts as a thermal insulator to prevent the microwave from being damaged and overheating during the smelting process. Kiln is 9.5 inches tall.

• The kiln shelf is made of high alumina, which is microwave transparent (allows microwaves to go through the material). It is dense and less susceptible to warping and is safe to use up to 2400F degrees. Your kiln shelf should be dry and protected from moisture at all times. Due to the high temperatures achieved in the microwave process, all kiln shelves will eventually crack due to thermal shock and you may notice a small hairline crack after using it. This is cosmetic only and does not affect the structural integrity of the shelf. 

Flux material (specially formulated and designed for the microwave process) is mixed with your concentrates before smelting. The flux protects the crucible, allows plasma arcing to occur, and refines the gold processed to a higher degree of purity. When firing, black sands concentrates, iron oxides, etc. are held in suspension by the flux so that the precious metals can be separated and poured into the mold as liquid metal. Store the flux in a dry and safe location, away from children and pets. Wear your dust mask and gloves when mixing the flux and concentrates together.

Crucibles go into the kiln and are the "clay pots" that contain your mix of flux and concentrates (or scrap jewelry or old coins you want to melt down). Crucibles can be used several times until the wall becomes too thin. Flux coating on the inside helps them last. Only clay crucibles are microwave transparent (allows microwaves to go through the material). The crucible inside the kiln will ultimately reach temperatures in excess of 2300 degrees Fahrenheit! Make sure there is 1” of space between the top of the crucible and the kiln lid. When crucibles are placed inside the kiln, they absorb most of the microwave energy and only allow a small amount of it to pass through them into the interior where the conductive flux and metals are contained. As a result the crucibles will get very hot, however the plasma arcing that takes place inside of clay crucibles is greatly reduced. In other words, your heat is now a radiant heat from the crucible penetrating inward, rather than the plasma arcing and heating taking place directly inside of the clay type crucible. Always keep your crucibles completely dry; the slightest bit of moisture can cause a crucible to crack upon heating. “Season” crucibles before use be heating the empty crucible inside the kiln in microwave for 15 minutes. Remove the kiln and crucible from the microwave and allow it to cool. Repeat this process again for 15 minutes the second time. This drives off any moisture in the crucible, making it ready to receive its first charge.

• The conical mold is cast iron. Always pre-heat the cast iron mold to drive off any moisture before pouring into it and to prevent HOT splatters from occurring. After pouring the molten flux mixture into the conical mold, the cooling process begins. The molten flux is actually a form of borosilicate glass and, during the cooling process, the glass will shrink and crack. Often times during the cooling period, small shards of glass will fly outward, so keep kids and pets out of the area and wear safety goggles and protective clothing. After the mold and the borosilicate glass have cooled, invert the mold and the conical shaped glass will drop out of the mold. The smelted metal “button” of gold or silver will be on top of the conical shaped glass. Shop for other molds on Amazon.

Download a .pdf here containing more instructions and details about the Microwave Gold Kiln Process.

Microwave Kiln Gold Processing Kit

    You may also be interested in a
    Kwik Kiln melting kit.
    Check them out here.

    Important Safeguards for Using the Microwave Gold Processing Kiln and Kit:

    • Set up your workspace away from your home, in a well ventilated area, such as the garage with the door open, or outside.
    • Keep your workspace free of flammable materials.
    • Do not use the microwave kiln in the house. The temperatures achieved during the process are in excess of 2300 degrees Fahrenheit and the danger of fire is too much of a risk. Also, fumes coming off of the crucible during the smelting process that can be hazardous if not properly ventilated.
    • A separate, dedicated 1200 watt microwave is recommended. Do not use your household microwave for smelting and then use for food. Using a microwave with less than 1200 wattage is not recommended.
    • Allow at least 1 inch space between the top of the kiln and the ceiling of the inside of your microwave oven.
    • Allow the microwave to cool at least 20 minutes between firings.
    • Keep microwave door open between multiple firings, for effective cooling. Always remove the kiln from the microwave after firing, to prevent heat from building up and damaging your microwave.
    • Do not try to heat a crucible in the microwave alone, without Ceramic Fiber Kiln in place around it.
    • Do not leave microwave unattended while the smelting process is underway.
    • Immediately turn off the microwave if any sparking occurs or if a crucible breaks. If you cannot reach the control panel, pull the plug.
    • Allow the microwave and kiln to cool before trying to deal with any type of spill.
    • Always clean microwave after use.
    • Do not attempt to fire materials other than whose listed in the directions.
    • Use common sense during this process, and always wear protective gear!

    DISCLAIMER: No guarantee is given on the amount of gold or silver obtained from this process, as it depends upon the quality of your concentrates. The kiln is not a toy and is not to be used by children. This kiln generates temperatures in excess of 2300 degrees! Please do not allow children or pets in the room when you are firing! Use at your own risk and follow all recommended and common-sense safety precautions. Seller and manufacturer are not responsible for accidents or injuries caused by hot kilns. By purchasing the Microwave Gold Kiln or Kits, the purchaser acknowledges this and agrees to use at his or her own risk.


    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 10 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. Additionally: 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.

    A Practical Guide to Modern Alchemy                $25.95
    The Art of the Microwave Fire Assay

    The definitive book on how to perform fire assays inside a microwave, along with cupelling with the new Kwik Kiln. This book can be included with your Microwave Kiln or Kwik Kiln. Click here to purchase.

    Book Review - May 2014
    "A very thorough yet concise book written by inventor and prospector Patrick Moulton.  At 92 pages, this book is not like most books about fire assay which typically speak over the average prospector's head.  Moulton has done an excellent job giving readers technical specifications for proper noble mineral recovery from a variety of common ores without the reader becoming confused.  The book includes information in technical terms and general terms so readers can comprehend the process of melting metals and processing ore through a fire assay. Very helpful information on how to mix fluxes, prepare your crucible, melt gold and silver, and how to stay safe doing it.  Additionally, Moulton introduces two pieces of equipment every small scale miner should own:  The Microwave Gold Kiln and small Kwik Kiln.  Both furnaces offer the sampling or melting of small batches of material without expending a tremendous amount of energy or time.  This book explains the fundamentals of the fire assay and cupellation process in terms even beginners can understand, but provides enough information for a lifetime.  Two thumbs up! " - Josh Turpin, High Plains Prospectors, LLC