1. These solutions are reported to be used in the gold cyanidation process. 2. The roasting-cyanidation Carlton Mill opened in March 1951. 3. Cyanidation of tailings commenced on the Croydon Goldfield in 1894.4. The mined ore is processed with gold cyanidation . 5. The Forrest-McArthur cyanidation process of treating mill tailings was perfected by 1895. 6. Recovery rates for silver were below 7 %, because the metal is bound within cyanidation processing. 7. The processing techniques can include grinding, concentration, roasting, and pressure oxidation prior to cyanidation . 8. One source of controversy involved the method used for mining, gold cyanidation , which causes pollution. 9. To improve the leaching process in the gold cyanidation , lead ( II ) nitrate solution is added. 10. Since around the year 2000, lead ( II ) nitrate has begun to be used in gold cyanidation .
