Papers - Ventilation and Air Conditioning of the Magma Mine (T.P. 979)
- Organization:
- The American Institute of Mining, Metallurgical, and Petroleum Engineers
- Pages:
- 15
- File Size:
- 827 KB
- Publication Date:
- Jan 1, 1940
Abstract
THE Magma mine, of the Magma Copper Co., at Superior, Pinal County, Arizona, is 68 miles east of Phoenix and 21 miles west of Miami, Arizona, on highway U. S. 180. Temperatures and Underground Waters Surface Temperatures.—The average surface dry-bulb temperature at Superior is 72.4°; wet-bulb, 57.4°; with an indicated relative humidity of 38 per cent. The average yearly rainfall from 1921 to 1936, inclusive, was 18.74 in. The maximum condition of the atmosphere is in June, July and August, and the minimum is in January and February. The surface temperatures, of course, influence the temperatures of the downcast shafts; however, the variation between winter and summer causes a difference of only 2" to 3" in the stopes and working places that are not close to the intake shafts. Average atmospheric conditions are shown in Fig. 1. Rock Temperatures.—Rock temperatures on the deeper levels of the mine are as follows:
Citation
APA: (1940) Papers - Ventilation and Air Conditioning of the Magma Mine (T.P. 979)
MLA: Papers - Ventilation and Air Conditioning of the Magma Mine (T.P. 979). The American Institute of Mining, Metallurgical, and Petroleum Engineers, 1940.