by Spectrum Engineering (Spectrum Engineering 1990), but reclamation did not include 

 evaluation of the mine workings for use by bats. 



Our 2001 assessment focused on the mine workings on BLM lands between the Swamp Frog 

 (5380') and the Lisbon (6800') mines, and also included the Marie, Robert's Incline, Dandy, and 

 CM & M mines, all within T9S, R27E (Fig. 1). We excluded visits to the highest-elevation 

 mines, on U.S. Forest Service lands in T 8S, R 27E (Old Glory [=Ponderosa] and Sandra mines), 

 because of deteriorated roads and prior indication of limited or low potential for use by bats 

 (Madson and Hanson 1993, Martinez 1995). Landscapes at all mine sites we visited were 

 dominated by limber pine-juniper-sagebnish habitat, with some Douglas-fir intermixed at the 

 higher sites. 



We inspected mine workings and trapped bats during three visits in summer 2001: 17-18 July, 

 24-29 July, and 4-6 September. For each mine site, we documented the presence of open portals 

 and noted portal dimensions, obstructions, and the presence of bat spoor. Workings deemed safe 

 for entry were examined for the presence of bats or bat sign, and internal dimensions measured 

 with a cloth tape or estimated. Mine ambient temperature and relative humidity, when recorded, 

 were measured with a sling-psychrometer. 



Bats were captured at portals using 50-denier mist nets of various lengths (usually 8' or 18'), 

 depending on dimensions of the portal. We used an electronic bat detector (ANABAT II; Titley 

 Electronics, Ballina, Australia) to aid with detecting the presence of bats in the area while we 

 operated mist nets. Typically, nets were deployed at dusk and operated for at least 3-4 hours 

 (often until midnight or later). Captured bats were identified with aid of keys in Nagorsen and 

 Brigham (1993) and Foresman (2001b); individuals were sexed, aged, measured (forearm, 

 weight), reproductive status noted, then released. 



RESULTS 



The sequence of mines presented below is arranged from lowest to highest elevation. Names for 

 mine workings and reclamation sites follow Spectrum Engineering (1990). 



Swamp Frog (T9S, R27E, Sec. 17NESE). We visited this mine site (5380' elevation) on 17 

 July, and netted at the two shallow adits of the "Central 1 Site." The two adits are approximately 

 8-10' apart. The north adit is very shallow (10') with passage about 8' x 8' in height and width, 

 the south adit is a simple relatively level working of same dimensions about 85' in extent with a 

 partially collapsed entrance about 3' x 8'. A few scattered bat droppings were present in the 

 south adit, but no bats were seen. 



We deployed a net across the portal of the south adit, but captured no bats in three hours. 

 However, we noted 8-10 passes at and into the north adit by perhaps 3-4 individuals of an 

 unidentified Myotis species. During our walk out (at 00:15 on 18 July) we briefly heard the 

 audible clicking of a Spotted Bat [Euderma maculatum) flying above us in the Swamp Frog 

 "Central 3" area. 



