As part of the ongoing baseline survey being funded by Rosemont Copper Company for their Rosemont Project, WestLand Resources, Inc. (WestLand) surveyed 21 abandoned mine features within the Rosemont Holdings and vicinity during the warm season of 2012 to search for evidence of bat use or monitor known bat use. The Rosemont Holdings encompass patented and unpatented claims and fee lands within privately owned, US Department of Agriculture (USDA) Forest Service, and Bureau of Land Management lands on the northeast side of the Santa Rita Mountain Range (Figure 1).
WestLand conducted initial site visits in 2006 to evaluate the potential resources for lesser long-nosed bat (Leptonycteris yerbabuenae), listed as endangered under the Endangered Species Act, and other bat species in the Rosemont Holdings and vicinity. Ultrasonic acoustic survey investigations were conducted in 2007, and ultrasonic acoustic surveys and mining feature investigations, along with wide-ranging surveys for foraging resources, were conducted in 2008 (WestLand 2009a and 2009b). Acoustic, infrared, and roost site surveys to date confirm that the Rosemont Holdings support L. yerbabuenae foraging resources and day-roost sites (WestLand 2009b, 2010, 2011 and 2012). In addition to L. yerbabuenae, at least 10 other bat species have been recorded from the area, including the nectar-feeding Mexican longtongued bat (Choeronycteris mexicana) and nine species of insectivorous bats. From 2008 to 2012, 165 potential roost sites within the Rosemont Holdings and surrounding region were evaluated (WestLand 2009b, 2010, 2011 and 2012).
Buecher, D.C., and R. Sidner. 2013. Rosemont Project 2012 Bat Roost Surveys. Project No. 1049.37. Tucson, AZ: WestLand Resources Inc. March 22.