Fig. 1 8 Photomicrograph of rich ore, Stella mine. The spaces between the sharp 

 crystals of pyrite are filled with sericite, chlorite and secondary quartz. Graphite 

 is abundant in the pyrite, where, of course, it does not show in the photograph, 

 and as small flakes and elongated grains in the light colored minerals. (Magnified 

 27.5 diameters) 



Fig. 19 Photomicrograph of rich ore, Stella mine. Rather large crystals of pyrite, 

 with graphite, sericite, chlorite and secondary quartz. (Magnified 27.5 diameters) 



