Beneficiation of Calico District, California, Silver-barite Ores.
Agey-WW; Batty-JV; Wilson-HW; Wilson-WJ
NTIS: PB 221 637 :15 pages
The calico silver-barite deposits near Barstow, California, are a potentially important resource. Exploration performed by two major mining companies outlined large tonnages of ore that assayed at 2 to 3 ounces of silver per ton and 7 to 15 percent barite. Laboratory beneficiation work was done by the Bureau of Mines on four samples to develop methods for recovering the silver and/or barite. Cyanidation recovered from 47 to 60 percent of the silver from ore ground to approximately 100 percent minus 325 mesh. Slat roasting minus 10-mesh material, followed by regrinding and cyanidation, recovered 75 to 85 percent of the silver. From 75 to 90 percent of the barite was recovered in a plus 92-percent barite product from either the natural ore or from cyanidation residues. Salt roasting before cyanidation precluded recovery of the high-grade barite concentrate from the leach tails.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 221 637