496 Canadian Record of Science. 



somewhat laminated appearance. The value of this 

 variety often exceeds that of the others mentioned. The 

 relative values of these varieties, together with the fact 

 that locality bears such a strong relation to their silver 

 value, may go to show that the silver itself exists outside 

 of a chemical combination with this mineral. Silver is 

 found throughout the whole range, pervading all forma- 

 tions and associated with so many different minerals that 

 the question of the form in which it is present becomes 

 interesting. 



Tetrahedrite, or "gray copper," is widely represented, 

 and much sought after. It is usually of a dark grey color 

 with a faint iridescence and a texture like steel galena. 

 Specimens of this carry from 200 oz. to 800 oz. of silver. 

 It occurs associated with galena, zinc blende and calcite, 

 giving, upon decomposition, very beautiful ores of azurite 

 and malachite. Silver has entered into many curious 

 relations where the absence of galena has caused its 

 association with some other mineral. One case occurs 

 near Slocan Lake, where little bunches of native arsenic 

 have been found containing 1,000 oz. to the ton. 



In one of the principal producing mines, the " Alamo," 

 upon Silver Mountain, it is found with antimony, giving 

 a very rich ore. This is known as " antimonial silver." 

 The mineral is very dark grey, sometimes faintly streaked, 

 and occurs as small patches included in a matrix of cubical 

 galena. 



Silver is found in combination, as Sylvanite in one 

 mine near Slocan Lake, as " Euby silver" in several places 

 and as native silver filaments and silver sulphides all 

 about the limits of the Slocan area of limestones, in 

 granite. 



These latter constitute the dry ores of the district, and 

 are rarely found in the main galena limestone belt. 



Argentite is usually associated with iron pyrites in a 

 coarsely crystallized gangue of quartz. Often this 



