Ore Deposits. 
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FIG. 7. 
Impregnation Vein or Deposit. 
19 
Fig. 7 exhibits 
that class of ore de- 
posits known as Im- 
pregnation Depos- 
its. In this class 
the metalliferous 
aggregations do not 
possess any regular 
outlines, and the 
ore is generally dis- 
seminated through 
the enclosing rocks 
forming irregular 
clusters on either 
side of the fissure. 
Although met with in formations of almost every age 
they occur most frequently in igneous and other crystal- 
line rocks. 
Fig. 8 illus- 
trates that 
class of ore 
deposits known 
as Stockwork 
Deposits. This 
form is closely 
allied to the im- 
pregnation 
class. They 
consist of a 
network of 
FIG 8. 
Stockwork Deposit. 
small veins interlacing one another and traversing the 
rocks in various directions, the whole of the ore present 
is not, however, confined to the veins, a considerable por- 
tion of it being contained in the enclosing rock itself. 
