MW Mining & Inspections has just about perfected the ore crushing part of the process. We can crush, mill, separate and process 300 to 400 pounds per hour.
NOW HERE’S THE HARD PART – EXTRACTING PRECIOUS METALS FROM CONCENTRATES.
Extracting the gold and other precious from the ore concentrates is a much more complicated process than we had ever imagined. Through a very complex strategy of trial and error we have experienced varying results. Our staff has learned so much through this process but not without stumbling stones.
However, every week we have progressed to the point that we think within another couple of weeks we will have the process conquered. THE PROCESS: Collect ore from Tuscarora mine, transport back to Kuna, Idaho, crush it to ¾ minus, flail mill it to 200 mesh, separate it with the shaker table to a concentrate, then smelt it and then sell it. PROCESS COMPLETE!! REPEAT PROCESS
The gold mining and extraction business is a very tight-lipped community that does not give up its secrets easily. It seems everyone has an opinion from the massive mining companies to local YouTube hacks with varying styles they use to release the gold molecules from other evasive metals like lead, iron and a host of pyrites and sulfides.
All the ways we have tried are very complicated and can be highly toxic, but we’ve done our best to experiment with the appropriate processes available to the best of our abilities and finances.
The current and common gold extraction processes used by most of the bigger companies are a series of toxic techniques, plus, the use of extremely harsh chemicals such as lime, nitric acid and hydrochloric acids combinations, plus cyanide or mercury, which all contain a high level of toxicity, plus the waste materials remaining after gold recovery often contain toxic metals or minerals.
A grinding-liberation is one of the processing techniques procedures we have chosen to even further reduce the size of the gold molecules in the concentrated ores.
The roasting of sulfide’s ores is often the first step in the oxidation needed to extract precious metals from concentrates. In roasting, the ore concentrate is treated with very hot air causing an oxidation reaction.
During roasting, the sulfide is converted to an oxide, and sulfur is released as sulfur dioxide, in the form of a gas.
Smelting is a way of obtaining metals from a mineral-bearing ore and dates to pre-historic times.
It usually involves the reduction reactions in which chemicals help remove the electrons from elements, reduction being the opposite of oxidizing reactions of metal oxides (the ore) to pure metal and the formation of non-metal oxide waste known as slag.
Precious Metal bearing ores need to be heated to very high temperatures to release the metals - far higher than open fires can usually produce. We needed a high enough temperature to melt the gold. Metals melt at different temperatures.
For example, lead melts at 328°C (622°F). For gold we need over one thousand degrees Celsius (1943°F) to smelt/melt it. That's a very high temperature! Iron has an even higher melting temperature than gold - iron melts at about 1800ºC (3272 ºF).
So, even with our limited resources Mark was able to build a smelting furnace that now reaches of 2300°F for smelting the concentrates into a Dore” Bar.
Cupellation is the final refining process in metallurgy, where alloyed metals are treated under very high temperatures and have controlled operations to separate noble metals, like gold and silver, from base metals like lead, copper, zinc, arsenic, antimony or bismuth, present in the ore.
The process is based on the principle that precious metals do not oxidize or react chemically, unlike the base metals; so, when they are heated at high temperatures, the precious metals remain apart, and the others react forming slags or other compounds.