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Shafter Project, Texas
Shafter Technical Report
Location and History
Shafter is located in southwest Texas, 29 kilometers (18 miles) north of Presidio; Highway 67 and a major power line cross the property. The Shafter deposit is an eastern extension of the original Presidio mine, where historic production totaled 35 million ounces of silver. Previous exploration comprises 891 drill holes, a 320- meter shaft and 1,555 meters of underground development.
Silver mineralization at Shafter is manto-type replacement associated with karst development in Mina Grande Formation limestone over approximately a three-mile length. Test work indicates in-tank leaching will yield silver recoveries of 86% to 87%.
A scoping study by Kappes, Cassiday & Associates suggests mining at the rate of 324,000 tons per year to initially produce 3.2 million ounces of silver per year. Silver production would average 2.6 million ounces over the seven-year mine life.
Silver Standard has initiated the process to sell Shafter.
For details on the reserves and resources of the Shafter Project,view the current Resource Summary (312 kb pdf).