A Test of Two Methods for Waste Rock Drainage Quality Prediction: Aqua Regia Extraction and Single-addition Net-acid Generation Test Leachate Analysis

Abstract The mobility of contaminants from mine waste can be assessed using different extraction methods. Aqua regia (AR) is the most commonly used method in Finland. Another analysis leachate net acid generation (NAG) tests, which primarily designed for production potential assessment. We investigated performance single-addition NAG test and AR drainage quality prediction, rock water samples several Finnish sites. Our objective was to improve interpretation results prediction. effectively reflected elements that occurred elevated concentrations water, though it over-predicted Al, As, Cd, Co, Cu, Ni some circumneutral drainages, Cr general. also performed well assessing including Al at As tend precipitate neutral solution, usability cases should further investigated. Furthermore, conclusions presented this study are limited collected surface piles; future work will examine history, dump cores, changes, etc. more detail.