SALINE GROUP. 



77 



At the Mayo Mines, Dr. Warth"'^ has found from his survey that the salt 

 occurs in five great beds having- a united thickness of 275 feet, alter- 

 nating- with another 275 feet of kallar or impure salt, the whole of this, 

 saline group being intercalated in the upper part of about 1,000 feet of 

 red marl and gypsum. 



.Single beds of the salt are over 100 feet in thickness here, and 

 in other parts of the range vary from 6 to 30 feet; indeed, the salt occurs 

 so frequently that it does not appear to have ever been necessary to 

 trace out the extension of any particular bed. 



The beds are not all of equally good salt, some containing a little 

 earthy matter, but many, if not the majority of 

 them, consist of the mineral in a fine translucent 

 or even transparent condition varying from crystalline to compact. 



The following analyses of the sah of the (Khewra) Mayo Mines 

 will be found with others in Dr. Warth^s Report 

 already mentioned, these having been made by 

 Mr. Cornelius Hickey, Chemical Analyst, Agraf : — 



Composition. 



CoNTElfTS. 



I. 



II. 



III. 



IV. 



V. 



Average. 



Earthy matter ... 

 Sulphate of lime 

 Chloride of calcium 

 Chloride of magnesium 

 Chloride of sodium 

 Water and loss ... 



Trace. 

 0-77 



0-71 



94-60 



3-92 



Trace. 

 069 

 0-42 

 0-71 

 92-84 

 5-34 



Trace. 

 0-92 

 116 

 1-34 

 92-80 

 3-78 



0-04 

 0-68 



2-22 



91-74 



5-32 



Trace. 

 0-75 

 0-50 

 1-25 

 93-00 

 4-50 



Total 



100-00 



100-00 



100-00 



100-00 



100-00 



No. I. Purest white crystalline salt. 



No, II. White salt as sold from depot, Buggy Mine. 



No. III. Red salt as sold from depot, Slijewal Mine. 



No. IV. Mixed red and white salt as sold from depdt, Buggy Mine. 



No. V. Average good salt of Mayo Mines calculated from the others. 



* Report in Appendix to Administration Report, Inland Customs, 1869-70. 



t Dr. Fleming thought the salt contained no chloride of magnesium, and that the 

 red salt derived its colour from something of an organic nature (p. 243, Report previouslj' 

 quoted). Dr. Jameson (auth. cit.) speaks of crystals of quartz as occurring, though rarely, 

 in the salt. These I have never observed or known to be observed, 



( 77 ) 



