Shahzad,
If you would like to be helped in your quest to refine gold from e-waste using cyanide it would be best if you told us something about your process and how you are currently processing your e-scrap. Do you have a system for collecting scrap components? Do you have any equipment to de-populate the boards and or granulate the boards? What is your final goal, gold and silver recovery or are you looking to recover copper as well?
Please describe what you have and how you plan to process this material. Why have you chosen cyanide as your best option? Cyanide is definitely an option, but not the only option.
When you get back with some details, you will get much more attention and help.