Canadian mining journal July-December 1915 . in the quartz veins is con-formable to an irregularity in one of the walls orboth, as if the irregularity had been there in theschist first, and the vein had grown around it leav-ing remnants of it, like shore lines, in the veinwhich had gradually replaced it. The absence of any sharp walls and the irregu-larities in dip and strike of the lodes, as well asthe absence of any indications of planes of ruptureat the ends of the lodes in continuation of them,precludes any possibility of their having formed onfaults or shear zones. In fact study has made
Canadian mining journal July-December 1915 . in the quartz veins is con-formable to an irregularity in one of the walls orboth, as if the irregularity had been there in theschist first, and the vein had grown around it leav-ing remnants of it, like shore lines, in the veinwhich had gradually replaced it. The absence of any sharp walls and the irregu-larities in dip and strike of the lodes, as well asthe absence of any indications of planes of ruptureat the ends of the lodes in continuation of them,precludes any possibility of their having formed onfaults or shear zones. In fact study has made itclear that they have formed in zones renderedpermeable by tension strains. There were few orno open spaces such as could give rise to crustifica-tion phenomena, but within the limits of certainzones lateral tensile stresses produced lines ofminimum compression allowing the ascending solu-tions which are presumed to have given rise to theveins, an opportunity to circulate upward amongthe foliae and minor fractures and joints of Contact Lode Structure. No. 417 Slope. MclnMrc Mine Fissure Vein Type. The Jupiter Mine hiwhich well illustrates this type of ore body, hutprobably an even better example, and one whichhas been much more closely studied, is No. 5 veinof the Mclntyre Mine, on the north side of PearlLake. This vein was the first recognized by thewriter as being of this type, and constitutes anexcellent example. In the most restricted sense, wherein a truefissure vein is a crustified deposit formed in an (Setober 1, 1915 THE CANADIAN MINING JOURNAL 591 open fissure, the term cannot properly be applied: to this vein, nor to any other in the district; butthe sense in which this is called a fissure vein isthat it was formed along a thrust fault, through thereplacement of its hanging wall. No. 5 vein of the Mclntyre is a banded vein ofirregular width, with a well defined foot wall andno distinct hanging wall at most points. Here andthere where a strong joint or an
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