HOW TO MAKE YOUR LEACH
There are many different kinds of leach, we have listed two that we have found to work well for us. It is important that you realize that certain leaches work better on different kinds of ore and carbon depending on what other elements are included in the ore complex. We have found the 4:1-AR (diluted) solution to work better on the carbon AND that the 7:1 SSN is probably the best overall leach, although the halox leaches work very well, we are not recommending them here as they are a bit more toxic and harder to handle.
SSN Leach 7:1
SSN Leach.7: 1 (Saturated salt and Nitric acid) this is one of the best leaches for leaching gold and complex hard to leach ores and can be enhanced with addition of a small amount of Iodine. The only downside is that once you have leached your ore or carbon you must neutralize the nitric before you try to extract any of the precious metals out of the pregnant leach. Follow the directions very carefully and you will have an excellent leach for your ore and carbon. This is a mild but very aggressive leach for gold and other precious metals such as the platinum group metals (PGM's). It is not as harmful to the skin as the AR leach nor are the fumes quite as toxic, but we still recommend care and caution when making and handling this leach.DIRECTIONS: NOTE: This recipe is for 2 gallons of leach; you just use the same ratio to make any amount you want. Be sure that you have a well-ventilated area when mixing any chemicals… do not breath the fumes!
AR Leach 4:1
AR Leach 4:1 (Aqua Regia leach) This 4:1 formula is for a diluted AR is highly recommended for gold recovery as it can be a bit more selective for the gold and is recommended for leaching gold from the carbon. Follow the directions very carefully as in the making of this leach as the off gas can be harmful to the lungs and very toxic. Our final product is a dilution of 4:1 but we have the make the leach full strength and it is quite toxic and dangerous if handled improperly. When you have the full strength AR made you let it set at least 24 hour at room temperature to "cure". After being "cured" you then dilute it 4:1 and you are ready to go. Once in its "diluted" state in is an excellent leachant for gold and is not an expensive leach to make. Remember even in a diluted state you do not want to breath the fumes and extreme caution and care should be exercised when handling this leach. DIRECTIONS: use the same ratios to make any size batch you wish. Be sure that you have a well-ventilated area when mixing any chemicals… do not breath the fumes!
HOW TO LEACH OUT YOUR CARBON OR ORE
Once you have removed your carbon from the stream we recommend that you take a small amount, approximately ½ teaspoon of the carbon granules and test with the Gold Hunter Test Kit. If you get a nice purple color reaction for gold then you probably have enough gold on the carbon to proceed with the leaching process. Just follow the directions for leaching the carbon and stripping the gold.
HOW TO EXTRACT GOLD FROM SOLUTION
You will need to follow these steps very carefully as gold extraction can be quite exasperating AND REMEMBER you do have to have gold in the solution to be able to extract it out. There are many methods for extracting gold and these that we recommend those that have worked best for us. We are going to recommend several different methods and all have been quite successful for gold extraction but again it depends on the complexity of the ore and how you follow directions. We are not in the "refining" business nor do we expect that you are equipped to do refining. You will need more equipment to get volume extraction and sometimes depending on what you do it can involve a considerable investment. That is why we recommend that you do a lot of preliminary testing and test extracting to see exactly the amount of gold that can be recovered. We will recommend some assayers that will reconfirm what you think you have but remember sometimes the assay will come back showing no gold and yet there is a considerable amount of micron or ionic gold in solution. Micron gold can be very difficult to detect when you send a sample for assay but when it is leached and changed to a gold chloride it can be easier to extract and get to a "button" of gold. Once you have progressed to a stage that you have gold into a gold chloride state then you will need to measure very carefully the amount of ore you used and the amount of gold recovered. In essence you really are doing your own assay but the beauty of you doing this process you can calculate the amount of gold that is recoverable and then just do the math to determine how much gold you can actually recover per ton and the exact cost of the materials needed. Sometimes there is good gold in a solution but it can be very difficult to get it to drop out of solution and into a form that is sellable. It depends on the complexity of the ore and sometimes other metals can hinder the extraction process. It is also very important to note the if you are using any leach with nitric acid as part of the mixture the nitric MUST be neutralized before you can properly recover the gold. Sometime too much iron will interfere and you may have to remove the iron first before proceeding. REMEMBER we are only giving a standard process and for the extraction to work there sometimes other factors to consider. If you gold in the solution and you can't recover it you have to go to a different process such as zinc cementation or use the Butyl Diglyme and Oxcalic acid solvent extraction process. We are only giving you recommended methods that have worked for us and other miners but we by no means guarantee that they will work for you. Extracting gold is very precise and a lot depends on the ORP (Oxidizing Reduction Potential) of the solution as your leach is working so we recommend that you have an ORP meter if you are going to be doing much extracting. Also the "ph" of the solution is very critical when trying to precipitate gold out of a solution and we also recommend that you have a ph meter or you can also get an ORP/PH meter with separate probes that will work quite well. You probably should have a magnetic stirrer which sometimes can be found on E-bay or other sites for somewhere between $50 and $100 and if you are going to do the DiGlyme extraction process then you will need some beakers and a sepatory funnel also which can be found on the internet. You probably will need a small furnace as to get the precipitant to a gold button you will have to furnace at 1750 to 1800 degree with some flux.
The Gold Hunter Test Kit