Metallurgical Testing At Candelaria Mine Project

 

VANCOUVER, BC - Silver One Resources Inc. has received encouraging assay results from the previously announced sonic drilling conducted on the leach pads, stockpiles and dumps on its 100% controlled Candelaria project in Nevada. Additionally, Silver One has submitted samples for metallurgical testing to evaluate the economics for recovery of silver and gold, based on the positive analytical results received.

Greg Crowe, President and CEO said, “The results to date are encouraging as the head grade of the leach pads, estimated at 43 g/t. Further, an average cyanide silver content of 56% for leach pad material and 64% for fresh material in stockpiles, combined with their respective silver grades reported, provide a very promising outlook for the project.

Historic silver recoveries at Candelaria ranged from 42% to 51% of the total silver through the heap leaching ores crushed at sizes below 1 inch. We believe that such recoveries may be improved by milling prior to leaching. The next step is to conduct metallurgical testing and the composite samples are now in the lab. We look forward to receiving metallurgical results to evaluate the economics for recovering silver and gold at Candelaria.”

Drilling was conducted on a 200-meter spacing rectangular grid with a hole in the center (providing a nominal spacing of 141 meters to 200 meters between drill holes) on LP1, on a 100 meter grid in LP2, and on a 50 to 75 meter spacing grid on the stockpiles.

All drill holes are 6-inch core holes drilled with a sonic rig and are vertical with variable depth between 1.5 meters to 96.6 meters. Sample intervals average 1.88 meters. Individual samples range from 0.6 meters to 3.96 meters all being true widths.

Results of preliminary cyanide bottle-roll tests conducted by the Company in December 2017 on samples collected near-surface on the leach pads, show recoveries between 15% to 20% of the total silver for material crushed to 1.7 millimeters (10 mesh). Reagents consumption was very low indicating that the cost of leaching the crushed material would be relatively inexpensive. Recoveries however, may be improved by milling prior to leaching. Therefore, current metallurgical testing is focused on evaluating milling-leaching scenarios. Further analyses of the samples will consist of additional bottle-roll tests at various finer fractions (-10, -65 and -200 mesh) using cyanide and ammonium thiosulfate. Results are expected by Q3 2018.

Candelaria was historically the highest-grade silver producer in the state of Nevada, averaging over 1,200 g/T AgEq (40 oz/t AgEq) from high-grade vein mining between the mid-1800s and the mid-1900s. Open pit mining operations were undertaken in the 1970s through 1998 by several companies, including Nerco, Inc. and Kinross. Kinross closed the open pit and leach operation in 1998 due to low silver prices. Leaching of the historic pads was not completed leaving a substantial amount of silver unprocessed. 

The company continues to expand its ground holdings at Candelaria Silver Mine in which it has staked an additional 416 claims to the east and south of the historic pits and heap leach pads. To date, the Company controls 12,345 acres (4,996 hectares) of patented and Bureau of Land Management (BLM) ground covering the areas of historic mining, leach pad processing and along potential strike extensions to the mineralized system.