ATAC Resources Ltd. June 18 reported a 1.69-million-ounce maiden gold resource for Osiris, one of three projects that make up the 1,700-square-kilometer (656 square miles) Rackla Gold property in the Yukon.

Osiris is where ATAC first discovered Carlin-type gold, which is found in sediment hosted deposits where very fine-grained gold is typically associated with pyrite or arsenopyrite. This type...