Page 84 - The Geology and Ore Deposits of Sierra County, New Mexico - Bulletin 10

MINING DISTRICTS 83
Nana workings. The vein is in limestone from which the over- lying flow rocks have been eroded. Copper appears to be the pre- dominant metal, although gold and silver are reported. This vein, being at a lower level stratigraphically than those in ande- site, shows evidence of contact-metamorphic action, with the de- velopment of garnet, epidote and coarse calcite in the wallrock.
U. S. TREASURY MINE
South of the Nana about two miles and at the head of an
arroyo tributary to Chloride Creek from the south, is a group of
claims which includes the U. S. Treasury, Gray Eagle, Whit( Eagle and others, located on a strong vein striking N. 50° W and dipping 65° SW. The vein (see figure 2) consists of an ande site hanging wall, 1 to 12 inches of fault gouge, 6 to 18 inches of banded and crustified quartz, 6 to 18 inches of finely crushed an desite breccia, and 3 to 20 feet of coarsely fractured andesit( which fades gradually into a solid andesite footwall. The frac tured andesite next to the quartz vein is cemented in part will'