Identifier: n02ontariosessional47ontauoft (find matches)
Title: ONTARIO SESSIONAL PAPERS, 1915, No.3-4
Year: 1915 (1910s)
Authors: ONTARIO. LEGISLATIVE ASSEMBLY
Subjects:
Publisher:
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: Ontario Council of University Libraries and Member Libraries

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the property has since been on this vein, which has beenfollowed to the 500-foot level, and on five levels stopes have been opened up along theore shoot. To the south of the shaft the general strike of the vein is about north andsouth, while the dip is to the east. The vein is very tortuous along its strike, at onepoint making a turn of more than 90°. There are also rolls and swells along the dipof the vein. One pronounced roll occurs at the 500-foot level which caused some diffi-culty in picking up the vein. In drifting on the vein to the south of the shaft a strongthrust fault was encountered on the various levels. This fault strikes northeast andsouthwest and dips to the southeast at 67°. Development on the 300-foot level showedthe displacement of the southerly portion of the vein to be 90 feet to the southwestalong the fault place in the drift. The movement of the fault was, however, in anoblique direction, as shown by grooves on the fault i))ane. Fragments of vein material 1915
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The Porcupine^JolJ_^«;^ North . Boundary 46 Bureau of Mines No. 4 were distributed along the fault between the parts of the vein. The ground to thesouth of the big fault for some distance is broken up with minor faults and dis-placements of the vein. The vein is primarily quartz, but a considerable portion of it iscarbonate which sometimes occurs in bands. There has been fracturing of the earlier constituents and later quartz has beendeposited in the transverse fractures. The later quartz is usually of a whiter colourthan the earlier quartz. The rocks enclosing the vein belong to the basaltic greenstoneseries and a later quartz-porphyry. The vein is not in the contact, but usually is notfar from the contact of the basalt and porphyry. Owing to the extreme alteration ofthe rocks along the vein it is not always possible to name the wall rock. Some rich

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