..and thiosulfate, thiourea, iodine, bromine, thiocyanate, some organic compounds ...all of them are as dangerous to you and the environment as "acids", maybe more. And the processes are very, very, very sophisticated.
If I had a great amount of ore in my garden, I would consult and pay an engineer to set up a process for me and surely not start something I have read here and there on a forum or in a book. Tons of ores, chemicals and waste are something else than a handfull pulverized chips in a 1 l round-bottom flask. Some grams can cause an accident threatening you, your family and your neighbours, some 100 kg can cause a disaster threatening a whole city.
So,that is my advice: Consult someone, who knows what and how to do.