hours, were attached to extendable aluminum poles (Mr. Longarm, Inc., Greenwood, MO) using 

 duct tape, and positioned to within 40 cm of the ceiling (ca. 1.4 to 2.0 m above ground). 

 Location of data loggers relative to portals was documented; data loggers were left in mines for 

 6-7 months before retrieval. Data loggers in the McDonald Mine adits were installed on 7 

 December 1998 and retrieved on 13 July 1999. At the Gypsum Mine, data loggers were installed 

 on 6 January 1999 and retrieved 13 July 1999. Summary Figures portraying data logger results 

 are presented at the end of this report. 



RESULTS 



McDonald Mine Sites. On 7 December (13: 10-16:30 MST), the two (east and west) gated adits 

 were entered and data loggers installed. In the East Adit, 8 hibernating Townsend's Big-eared 

 Bats (Corynorhinus townsendii) were found on the walls of the entrance hallway in the first 39.7 

 m (130 ft) beyond the gate. A data logger ("shallow") was placed at this point 39.7 m from the 

 portal, where the main passage angles sharply to the west (left). A second data logger ("deep") 

 was placed 106.7 m (350 ft) from the portal in this west-trending passage, shortly before the 

 workings open into a large room ascending to at least one additional level. No bats were found 

 in this section of the mine on the December survey, and the second level beyond the large room 

 were not checked. On the 1 3 July survey, a single unidentified Myotis flew from the entrance 

 when it was entered (08: 17) but no additional bats were present in the first part of the mine. One 

 Townsend's Big-eared Bat was seen flying in the upper parts of the large room. It is possible 

 other bats were present in this portion of the mine. 



In the West Adit no bats were found during the 7 December survey. This working was 

 surveyed entirely (about 50 m; 164 ft), and a data logger was left where the main haulway angles 

 sharply to the east, 12.7 m (41.7 ft) from the entrance. On the 13 July survey, a single 

 Townsend's Big-eared Bat flew from the entrance area and a nursery colony of 20-25 individuals 

 was found clustered tightly on the wall of the east-trending passage near its juncture with the 

 entrance passage, about 2.0 m (6 5 ft) beyond the data logger. 



The upper ungated adit was surveyed on 7 December; no bats were found. The working 

 is relatively shallow, extending 17.1m (56 ft) beyond the portal. 



Climate data from the lower gated adits (Table 1, Figures 1-6) show all workings were 

 relatively cool during the recording period (8 December 1998 to 13 July 1999). Temperature 



TABLE 1. Maximum and minimum electronic data logger values for temperature (°C) and relative 

 humidity (RH; %) at the McDonald Mine sacs (8 December 1998 to 13 July 1999) and Gypsum Mine sites (7 

 January 1999 to 13 July 1999). 



varied by 12°C (20°F) 39.7 m from the portal in the East Adit during this period. The range was 

 6°C (10.4°F) 12.7 m from the portal in the West Adit, and only 3.5°C (6.1°F) deep in the East 



