The ore deposits of Utah . Figure 49.—Fault of steep westward dip cut off by a bedding fault ata small prospect on the southern peak east of Camp Blaine, Simp-son Mountains. southern peak east of Camp Blaine (fig. 49) afault of steep westward dip that cuts off adark calcareous shale bed is itself cut off by afault along the bedding. Another fault, areverse one with strike N. 5°-10° W. and dip42° W., is exposed for a considerable distancealong the Blaine lower timnel. It finallyflattens rather abruptly and its upper endmerges with a bedding plane that dips gently. FiGtTRE 50.—Reverse fault expo
The ore deposits of Utah . Figure 49.—Fault of steep westward dip cut off by a bedding fault ata small prospect on the southern peak east of Camp Blaine, Simp-son Mountains. southern peak east of Camp Blaine (fig. 49) afault of steep westward dip that cuts off adark calcareous shale bed is itself cut off by afault along the bedding. Another fault, areverse one with strike N. 5°-10° W. and dip42° W., is exposed for a considerable distancealong the Blaine lower timnel. It finallyflattens rather abruptly and its upper endmerges with a bedding plane that dips gently. FiGtTRE 50.—Reverse fault exposed in Blaine lower tunnel, Camp Blaine,Simpson Mountains. Part exposed at diflerent places along tunnelinclosed in dotted scjuare. eastward (fig. 50). The mineralized fissures ofthe system that trends north to N. 15° W. cannot be foUowed on the surface for any consider-able distance. Fissures that strike N. 65°-85° W. and dipsteeply north are the most pcreistent of anyfound but are relatively short compared to thestrong fissures of the larger mining but not all of them are mineralized. The 35416°—19 29 450 ORE DEPOSITS OF UTAH. most persistent of this system are the mainfissures in the upper Bhiine tmmel and in theSilver Reef tmmels, the Blaine fissure havingbeen followed for at least 400 and the SilverReef fissure (in the lower tmmel) for over 500feet. Other fissures of the same system—forexample, the West End fissure of the Blameand the principal fissure of the Happy Jackworkings—have not proved continuous eitherhorizontally
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou
