lO ECONOMIC GEOLOGY. 



The history of the operations of the Dodge and Lisbon mines has 

 been quite varied. The Dodge company worked the mine and milled 

 the quartz from the date just mentioned to the last part of 1869. B. F. 

 Martin, the president, states that the sum of $24,500 was obtained while 

 it was under his care. For the six months from Di^cember, 1869, to 

 June, 1870, the property was leased to E. L. Hall and John McCall. 

 Dr. Rae says they obtained $6,570 during this time. Others estimate 

 the amount higher, — about 30 tons per week of ore, valued at $12, for 

 26 weeks, making over $9,000. Messrs. Fay and Wilmarth next leased 

 the property for six months in 1870-71, and are thought to have taken 

 out $2,000. In the spring of 1873, Dr. Julio H. Rae leased the property, 

 and applied a process of his own to the separation of the gold from the 

 quartz. He claims to have taken out $3,500 in July and August of that 

 year. He found an average of $25 to the ton at first, but afterwards 

 only $18 was obtained. Up to the time of the formation of the Electro- 

 Gold Mining Company, the entire amount of gold milled was $36,570. 

 Dr. Rae says it would be proper to add $5,000 for the supposed stealings, 

 and half as much for the value of the specimens that have been carried 

 away. 



This new company wrought the mine and mill successfully for two or 

 three years. From several letters written by the president, Dr. Rae, I 

 cull the following : 



Under date of October 17, 1873, he writes: 



Enclosed please find copy from book of one week's run, made while experimenting : 



Monday, one ton gross yielded 1550 grains of gold. 



Tuesday, " »< .< J620 



Wednesday, " " " 1850 



Thursday, " .« <. 2240 



Friday, " " " 1790 



Saturday, 600 pounds yielded 1220 



Monday, 1750 " " 1590 



Tuesday, one ton gross " ...... 2000 



Under date of March 25, 1874, he writes, — 



Our ore has averaged $19 per ton, the finest varying from 930 to 955, gold,— silver, 

 42 to 65. The ore has run down to about $1.25 per ton, and the richest of which I run, 

 probably about three tons, went as high as $95. The mean average of the ore can be 



