PART I. 
ORE DEPOSITS. 
CLASSIFICATION. 
Ore Deposits, in all their various forms of occur- 
rence in nature, may be briefly defined as being metalli- 
ferous aggregations occupying receptacles (made con- 
temporaneous with, or previous to, the time of deposi- 
tion) in the earth’s crust. 
The class to which the several forms belong will 
depend upon the mode of filling, the nature of the ore 
_ mass itself, the kind of cavity or receptacle containing 
the ore, and the position and relation of the ore deposit 
to the enclosing country rocks. 
To sum up the several classes as they are exhibited 
in nature and revealed by extensive excavations in the 
many mining districts throughout the globe, the follow- 
ing classification seems proper : 
I. Stratified Veins, or Beds. 
II. Contact Veins. 
III. True Fissure Veins. 
IV. Segregation Veins or Deposits. 
V. Massive or Chamber Deposits. 
VI. Gash Veins. 
VII. Inpregnation Deposits. 
VIII. Stockwork Deposits. 
IX. Fahlband Deposits. 
The several sketches of the more typical varieties 
or classes of ore deposits as outlined above and exhibited 
on the following pages are intended to convey to the 
