” Ore Deposits. 
+ VG 
0&6 \° X Ye aa 2 
rie 
aoe YY 
FOIA TOI, 
ee te! 4¢e ou, Pt) Ry 
AA on Oe 
AX 4 wy 4 
> AK P . 
. y bi 4 
‘e WP + 
* “YY wd y+ + + 
WF x WSF 4 
Bc + 4 °° ~ a 4 
Oe + eee 
t - # KH + 
4 s 
Ant y% % XE PY 
FIG. 3. 
True Fissure Vein. 
Fig 3 represents a True Fissure Vein. This class 
of veins traverse the rocks independently of their struc- 
ture, and are not parallel to the foliation or stratifica- 
tion of the enclosing rocks. Veins of this class are 
frrther distinguished by the presence of mud seams 
along the walls; ore in banded structure, and by gener- 
ally striking in a northerly direction. 
They have originated in dislocations caused by ex- 
tensive movement of the earth’s crust and are therefore 
believed to extend indefinitely in depth. 
