Hello , The site that gives a large amount of information on refining is by Shor International corp, they also have a great deal of free pictures,notice how I say free, they also sell equipment for refining but mst all you need you can find cheap in your local thrift store, I spoke of the E Bay man in disapointment because of how he came about his information on this recipe for gold extraction,and the fact that he sells this incomplete recipe for gold extraction without knowing how to do it him self,yes we would all like to make as much money as he has with little to no effort but what about all the people who mght get hurt by using a systm that is so incomplete? the danger is there for death or other bodily harm, This incomplete recipe is good to start but loses are made at the half way point,with this incomplete systm you will be hastled by silver troubles and loosing platinum group minerals, Like I said before,I have refined Au,Ag and Pt group minerals from scrap computers for many years, I started out with 1 old pick up truck and a lot of dreams,most of my dreams have come true but I still drive an old Chevy and havent lost site of where I came from, Most refiners that you would send your scrap circuit boards to will by them per pound or refine it for you but will stick it to you,Is there any honest refiners out there? there are a few but hard to find, I stay as honest as a man can because I know how it feels to be short on cash and have just enough scrap metal to sell and feed your kids, I also know the pain of cutting up a fortune in scrap circuit boards to get the gold plated parts just to have a rich dishonest man take it all for cents on the dollar, No you dont need a montain of computers to make money, some parts that I process are worth an average of 90 dollars per pound, I also process gold jewelr scrap,gold ore,problem ore and other precious metal bearing materials, I have customers that I have delt with for years,there is no reason to cheat people,there is more than enough moey in this biz to go around!!!! I also do samples for free,I am not trying to sell my services by the way, I am just giving examples of how things should be.one more thing I would like to mention,thrift store jewelry is plated 10-12 gold as a norm,electronics are plated 22-24 karat gold.