P. PEARSON 1955 Sept at Chosica. Oct 23 Traps at 1 mi. W Sisco tod 1 mina, 3 R's a.d.m., 6 R's a.m., and 1 [illegible] spring an later, probably by Zungarota. at 1 mi. E San Bartolome, the 5 set traps baited with bacon held 4 Zungarota, 1 not spring. Two of the rats badly eaten. The 5 museum specials baited with corn meal were all spring + empty. This place must be alive with Zungara rats. Shinning and big picking spars, then back to Chosica. Oscolla is about a mile or so below San Bartolome's. Oct 25 "How high can mining go?" by H. R. Cooke, jr., in Mining World [World Mining Section] 44-48, 71. August 1954 talks of a sulfur mine in Chile (Aucanquilecha) 5 mi. S of the Bolivian border and 16 mi. N of Ollagüe, Chile." The mine workings... reach about 20,200 feet in altitude". "Minimum Temperature ... at Aucanquilecha, minus 35° F. The maximum recorded at Aucanquilecha since 1913 is 36° F." Yorata "Specific gravity of 6,300 British Thermal Units per pound -- half that of Intumescence Coal." In Table No. I lists 50 mines above and 5, all in Chile, above 19,000 ft or higher. Lista Curiyaca as no 8. at 18,400; 11 mines 18,000 ft or higher. at Andesba, "... the mine cave, which is 17,500 ft deep, must be near man's living ceiling. Formerly the cave was a thousand feet higher, but the miners could not sleep with thirst and frost nights, so it was mined down to its present state. There the miners may play football often chasing on foot to the mine, walking seven hours, and mining down the mountains."