State: New Mexico
Elevation: 6,821 feet
The Trilby mine, 2,000 feet west of the summit of Fanney Hill, has long been idle and was inaccessible at the time of visit. At the shaft the vein, which is not prominent along the outcrop, follows the contact between Fanney rhyolite and Last Chance andesite, which strikes a few degrees north of west and dips steeply to the north. West of the shaft the Fanney rhyolite of the footwall is overlain by the Last Chance andesite. The vein may be the eastward extension of the Johnson vein, but the connection along the outcrop could not be established.
The shaft dump shows abundant coarse calcite with some quartz and fluorite, and, according to Scott the west end of the vein is notable for the quantity of fluorite it contains.
The development work consists of a 250-foot inclined shaft with a small amount of lateral development.
Source: Geology and Ore Deposits of the Mogollon Mining District New Mexico. USGS Bulletin 787, 1927