118 SILVER-LEAD DEPOSITS OF EUREKA, NEVADA. 



VARIOUS CLASSIFICATIONS OF ORE DEPOSITS. 



"The German word Gang comprises the English words lode, vein, and dike. 



'Veins which cut the stratification of formations if the country rock is stratified. 



c Veins between the strata of a formation which have been formed since the rock was deposited. 



d Similar to gash veins, only not coming to the surface. 



e Von Cotta makes a sharp division between ore and country rock a part of the definition of 

 stock. Grimm calls bodies which pass over gradually into the country rock, as well as those which 

 an- sharply defined, stocks (Stocke). Von Cotta also divides stocks into two classes — those that con- 

 form to the stratification of the country rock and those that do not. 



•'Von Cotta remarks that, strictly speaking, reticulated veins should not be classified as de- 

 posits of irregular form, but as the union of a great number of small veins; in other words, the 

 included angular fragments are so large, compared with the width of the fissures, that they cannot be 

 considered as horses. 



'Von Cotta uses these terms to describe the local occurrence of various irregular ore bodies. 



An examination of this table will show that the term lode as under- 

 stood by these authors cannot be applied to the wedge of limestone between 



