PLATE XC. 



1. Simple fissure vein with one fault plane and with quartz filling. Altered 



country rock on both sides. Filling only constitutes the ore. 



2. Complex fissure vein with three fault planes. Rich ore as filling along narrow 



openings, partly also by alteration of country rock immediately adjoining 

 fissures. Less altered country rock between and beyond the fault planes. 



3. Simple fissure vein without large open spaces. Ore partly as filling, partly as 



altered country rock. Less altef ed country rock on both sides of fault plane. 



4. Complex fissure vein with two fault planes, along which quartz is deposited as 



filling. Wide sheeted and altered zone between the two fissures. 



5. Irregularly shattered zone between two fault planes. Quartz filling in seams 



and cracks. Extensive alteration of country rock between fault planes. 



6. Single fissure in foot wall of porphyry dike. Dike traversed by stringers from 



hanging wall, shattered and extensively altered. Quartz filling in fissure 

 and seams. Rich ore in quartz vein. Altered porphyry constitutes low- 

 grade ore. 

 650 



