IOO 



ORDER OF DEPOSITION OF MINERALS. 



The following" table shows, in descending' order from the 

 youngest to the oldest, the general succession in the order of 

 deposition of ,the principal minerals of the Cobalt 

 area proper. There appear to be, however, minor excep- 

 tions to this order. 



III. Decomposition products, e.g., erythrite or cobalt 

 bloom, annabergite and asbolite. 



II. Rich silver ores and calcite. 

 I. Smaltite, niccolite and dolomite or pink spar. 



After the minerals of group I. were deposited the veins 

 were subjected to a slight movement. In the cracks thus 

 formed the minerals of group II. were deposited. A few 

 veins that escaped the disturbance do not contain silver in 

 economic quantity. 



This order of deposition appears to be the same as that 

 of the minerals in the Annaberg deposits of Germany and in 

 those of Toachimsthal, Austria.* At Annaberg the uranium 

 ore or pitchblende is said to have been deposited earlier than 

 the rich silver ores and later than the cobalt-nickel minerals, 

 while barite, fluorite and quartz were deposited prior to the 

 latter. At Annaberg there are thus considered to have been 

 broadly five periods of deposition, while at Cobalt there 

 have been but three, minerals representing the first and 

 third periods being absent. 



MINING AND MILLING. 



Descriptions of the working mines, and of the methods 

 employed in mining and milling, in the Cobalt area, are 

 given in part I of the Annual Reports of the Ontario Bureau 

 of Mines, and in the Annual Reports of Mr. A. A. Cole to 

 the Temiskaming and Northern Ontario Railwav Com- 

 mission. 



BIBLIOGRAPHY. 



References to most of the literature on the Cobalt and 

 adjacent areas are given in the report on the " Cobalt-Nickel- 

 Arsenides and Silver Deposits of Temiskaming/' fourth 

 edition, published by the Ontario Bureau of Mines, Toronto, 

 I9I3- 



*Beck, "The Nature of Ore Deposits," Weed's translation, pages 

 285, 289. 



