| Comments |
Breccia pipe at least 300 ft in diameter in Jurassic(?)-age intermediate and mafic igneous rocks. The strongest mineralization in the pipe is near its walls, and consists of angular blocks of intensely sericitized, fine- to medium- grained gabbro,with 1 to 5 percent sulfides, in a matrix of coarse amphibole, biotite, and plagioclase. Drilled 18 holes in 1990 and 1991 for a total of 5,300 ft. Drilled 5 holes in 2006 for a total of 750 m; three of the 5 holes cut mineralization: notable intercepts include (1) 73.5 m that contained 0.31 percent copper and 0.28 gram of gold per ton, (2) 51.0 m that contained 0.48 percent copper and 0.46 gram of gold per ton, and (3) 7.50 m that contained 0.36 percent copper and 0.53 gram of gold per ton. Two areas of mineralized breccia were identified. The westernmost breccia is a pipe-like body about 30 by 50 m in size; it is cut by a narrow fault with malachite and by thin sulfide- and magnetite-rich veins. The other breccia is a mineralized, pipe-like body about 75 by 150 m in size that extends to a depth of at least 75 m; it has disseminated copper minerals as well as sulfide-bearing veinlets. Propylitic and potassic alteration: development of secondary biotiteand potassium feldspar; local sericitization. |
