Tribute mining in Central Otago

Hi guys, iv’e lived in Alexandra most of my life but in Dunedin at the moment and have been gold panning since i was young but have got hold of a 4 inch dredge in the last 6 months and have been getting it ready for spring 2016, i need to find a place to dredge without worrying about the law, i have asked around central otago but no one is keen to let me work a tribute plan so i thought i would ask here. Anything will do just want to get out there and get into it.